Powered by Google-Search & Google-Books Chinese Standards Shop Database: 169759 (Sep 20, 2020)
HOME   Quotation   Tax   Examples Standard-List   Contact-Us   View-Cart
  

HJ 471-2020

Chinese Standard: 'HJ 471-2020'
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusRelated Standard
HJ 471-2020English459 Add to Cart Days<=5 Technical specification for dyeing and finishing wastewater treatment of textile industry Valid HJ 471-2020
HJ 471-2020Chinese25 Add to Cart <=1-day [PDF from Chinese Authority, or Standard Committee, or Publishing House]  

   

BASIC DATA
Standard ID HJ 471-2020 (HJ471-2020)
Description (Translated English) (Technical Specifications for Wastewater Treatment Engineering in Textile Dyeing and Finishing Industry)
Sector / Industry Environmental Protection Industry Standard
Date of Issue 2020-01-14
Date of Implementation 2020-01-14
Older Standard (superseded by this standard) HJ 471-2009
Regulation (derived from) Ministry of Ecology and Environment Announcement No. 6 of 2020
Issuing agency(ies) Ministry of Ecology and Environment

HJ 471-2020
(Technical Specifications for Wastewater Treatment Engineering in Textile Dyeing and Finishing Industry)
National Environmental Protection Standard of the People's Republic of China
Technical Specifications for Wastewater Treatment Engineering in Textile Dyeing and Finishing Industry
Technical specification for dyeing and finishing wastewater treatment of
textile industry
Released 2020-01-14
2020-01-14 implementation
Released by the Ministry of Ecology and Environment
Contents
Foreword ... II
1 Scope ... 1
2 Normative references ... 1
3 Terms and definitions ... 2
4 Pollutants and pollution loads ... 3
5 General requirements ... 4
6 Process design ... 5
7 Main process equipment and materials ... 12
8 Inspection and process control ... 12
9 Major auxiliary works ... 13
10 Labor safety and occupational health ... 14
11 Construction and acceptance ... 15
12 Operation and maintenance ... 16
Appendix A (Informative) Reference Tables for Water Quality of Various Textile Dyeing and Finishing Wastewater ... 18
Appendix B (Informative) Reference Table for Pollutant Removal Efficiency of Each Major Process Unit ... 20
Appendix C (Informative) Water Quality Recommendations for Reclaimed Water ... 21
Foreword
In order to implement the laws and regulations of the Environmental Protection Law of the People's Republic of China
Environmental pollution, improve the quality of the ecological environment, regulate the construction and operation management of engineering facilities for textile dyeing and finishing industrial wastewater treatment, and develop this standard.
This standard specifies the technical requirements for the design, construction, acceptance, operation and maintenance of textile dyeing and finishing industrial wastewater treatment projects.
This standard is a guiding standard.
This standard was first published in.2009, and this is the first revision.
The main contents of this revision.
-According to the requirements of "Technical Guidelines for Environmental Engineering Technical Specifications" (HJ 526-2010), supplemented and improved the elements of the standard and
Content orchestration
-Updated the content of "4 Pollutants and pollution load";
-The design principles of "classified collection, classified treatment, graded reuse" were clarified, and the wastewater treatment process technology and various
Process unit design parameters;
-Complement and improve the process technology of advanced treatment and reuse treatment;
-Added the technical requirements of "6.7 Sludge Treatment" and "6.8 Secondary Pollution Control";
-Supplemented and improved the technical requirements of "7 main process equipment and materials";
-Supplemented and improved the technical requirements of "8 Inspection and Process Control".
This standard was revised by the Department of Science, Technology and Finance, and the Department of Regulations and Standards of the Ministry of Ecology and Environment.
The main drafters of this standard. China Environmental Protection Industry Association, Donghua University, China Printing and Dyeing Industry Association, Tsinghua University,
CSSC Ninth Design and Research Institute Engineering Co., Ltd., Hubei Junji Water Treatment Co., Ltd., China Holding (Beijing) Water Operation Co., Ltd.,
Wesbon (Xiamen) Environmental Technology Co., Ltd. and Ziguang Environmental Protection Co., Ltd.
This standard was approved by the Ministry of Ecology and Environment on January 13, 2020.
This standard will be implemented from January 14, 2020.
This standard is explained by the Ministry of Ecology and Environment.
Technical Specifications for Wastewater Treatment Engineering in Textile Dyeing and Finishing Industry
1 Application
This standard specifies the technical requirements for the design, construction, acceptance, operation and maintenance of textile dyeing and finishing industrial wastewater treatment projects.
This standard is applicable to the construction and operation management of wastewater treatment projects in the textile dyeing and finishing industry.
Technical basis for environmental impact assessment, feasibility study and design, construction, acceptance and operation management of wastewater treatment projects.
2 Normative references
The content of this standard refers to the clauses in the following documents. For undated reference documents, the valid version (including the modification list) is suitable
Used in this standard.
GB 4287 Discharge Standard for Water Pollutants in Textile Dyeing and Finishing Industry
GB 14048 Low-voltage switchgear and control equipment
GB 14554 Emission Standard for Odor Pollutants
GB 15603 general storage rules for common hazardous chemicals
GB 18597 Standard for Pollution Control of Hazardous Waste Storage
GB/T 18920 Urban Wastewater Reuse and Urban Miscellaneous Water Quality
GB/T 22580 Technical requirements for plateau electrical equipment under special environmental conditions Low voltage switchgear and control equipment
GB/T 25499 Urban Sewage Reuse and Greenland Irrigation Water Quality
GB 50013 design code for outdoor water supply
GB 50014 outdoor drainage design code
GB 50015 building water supply and drainage design code
GB 50016 fire protection code for building design
GB 50019 Design Code for Heating Ventilation and Air Conditioning of Industrial Buildings
GB 50033 lighting design standards for buildings
GB 50037 building ground design code
GB/T 50046 Anti-corrosion design standard for industrial buildings
GB 50052 design code for power supply and distribution system
GB 50053 Design Code for Substations of 20kV and Below
GB 50054 design specifications for low voltage power distribution
GB 50055 Design Code for General Electric Power Equipment Distribution
GB 50057 Design Code for Lightning Protection of Buildings
GB 50059 35kV ~ 110kV Substation Design Code
GB 50187 Graphic Design Specification for Industrial Enterprises
GB 50194 Safety Code for Power Supply and Consumption at Construction Site
GB 50204 Code for Acceptance of Construction Quality of Concrete Structures
GB 50231 General Specification for Construction and Acceptance of Mechanical Equipment Installation Engineering
GB 50243 Code for Construction Quality Acceptance of Ventilation and Air Conditioning Engineering
GB 50335 Code for design of urban sewage recycling projects
GB J 22 Plant and mine road design code
GBZ 1 Hygienic Standard for Design of Industrial Enterprises
GBZ 2.1 Hazardous Factors in the Workplace Occupational Exposure Limits Chemical Hazardous Factors
GBZ 2.2 Hazardous factors in the workplace Occupational exposure limits Physical factors
HJ/T 242 Technical requirements for environmental protection products Belt press filter for sludge dewatering
HJ/T 245 Technical requirements for environmental protection products
HJ/T 246 Technical requirements for environmental protection products
HJ/T 252 Technical requirements for environmental protection products
HJ/T 283 Technical requirements for environmental protection products Box filter and plate and frame filter
HJ/T 336 Technical requirements for environmental protection products Submersible sewage pump
HJ/T 354 Technical Specifications for Acceptance of Water Pollution Source Online Monitoring System (Trial)
HJ 709 Completion of construction project Environmental protection acceptance technical specifications Textile dyeing and finishing
HJ 861 Sewage Permit Application and Technical Specifications for Textile Printing and Dyeing Industry
HJ 879 Technical Guide for Self-monitoring of Sewage Units Textile Printing and Dyeing Industry
HJ 990 Technical Guide for Accounting of Pollution Source Strength
HJ .2007 Technical Specifications for Wastewater Flotation Treatment Engineering
HJ .2016 Environmental Engineering Terminology
HJ 2025 Technical Specifications for Collection, Storage and Transportation of Hazardous Waste
HJ 2047 Technical Specification for Sewage Treatment Engineering of Hydrolytic Acidification Reactor
National Hazardous Waste List (Order of the Ministry of Environmental Protection No. 39)
Regulations for the Printing and Dyeing Industry (Ministry of Industry and Information Technology Announcement.2017 No. 37)
"Technical Requirements for the Standardization of Sewage Outfalls" (Trial) (Environmental Monitoring [1996] No.470)
"Interim Measures for Environmental Protection Acceptance of Construction Projects" (National Environmental Regulation and Environmental Assessment [2017] 4)
Regulations on Environmental Protection Management of Construction Projects (revised on July 16,.2017)
3 terms and definitions
The relevant terms and definitions in HJ .2016 and the following terms and definitions apply to this standard.
3.1 textile dyeing and finishing of textile
Refers to the process of chemical treatment of textile materials (fibers, yarns, threads and fabrics), including pretreatment, dyeing,
Printing, finishing (including general finishing and functional finishing) and other processes.
3.2 textile dyeing and finishing industry wastewater
Refers to waste water discharged by textile dyeing and finishing production facilities or enterprises beyond the legal boundary of the enterprise, including direct or indirect production and living
Relationship of various effluents.
3.3 comprehensive wastewater
Refers to the textile dyeing and finishing enterprises that are collected and classified before being discharged into sewage treatment plants (stations) or mixed and then discharged into sewage.
The general name of the wastewater from the plant (station).
3.4 pretreatment
Refers to the use of physical, chemical and biological materials for various types of wastewater discharged from textile dyeing and finishing before entering the recycled water or comprehensive wastewater treatment.
The main treatment method, the concentration of pollutants in various types of wastewater after pretreatment should meet the design inflow requirements for reuse or comprehensive wastewater treatment.
3.5 reclamation of dyeing and finishing wastewater
Refers to the process of collecting, treating, and reusing wastewater discharged from textile dyeing and finishing.
4 Pollutants and pollution loads
4.1 Wastewater sources and classification
4.1.1 Industrial wastewater from textile dyeing and finishing mainly includes pre-treatment wastewater, dyeing/printing wastewater, finishing wastewater and other wastewater. Its generation link
As shown in Figure 1.
Figure 1 Schematic diagram of typical production process and wastewater generation in the textile dyeing and finishing industry
4.1.2 The pre-treatment wastewater is mainly divided into.
a) The pre-treatment wastewater, mainly cotton printing and dyeing, mainly comes from desizing, scouring, bleaching and mercerizing;
b) Pretreatment wastewater mainly composed of chemical fiber printing and dyeing, mainly from degreasing, scouring and alkali reduction;
c) The pre-treatment wastewater mainly based on silk printing and dyeing mainly comes from cocoon cooking, reeling and scouring;
d) pretreatment wastewater mainly used in hemp printing and dyeing, mainly from degumming;
e) The pre-treatment wastewater mainly for woolen textile printing and dyeing mainly comes from wool washing and carbonization.
4.1.3 Dyeing/printing wastewater is mainly dyeing wastewater or printing wastewater.
4.1.4 The finishing wastewater is mainly the washing wastewater generated by the finishing treatment.
4.1.5 Other wastewater is mainly domestic sewage, part of the discharged condensate condensate and ground flushing water.
4.2 Wastewater volume
4.2.1 The wastewater discharge of existing enterprises can be determined through actual measurement. New enterprises can be compared with raw materials, production processes, production facilities, and management levels
And other similar enterprises, or determine the amount of wastewater produced based on material balance and water balance. Newly-built enterprises can also calculate water volume according to HJ 990.
4.2.2 The initial rainwater collection of an existing enterprise should be determined based on actual monitoring. The initial rainwater collection of a new (renovated or expanded) enterprise should be based on
It shall be determined according to the relevant requirements of the environmental impact assessment approval document or at least 15 mm of precipitation over the area of the polluted area.
4.3 Wastewater Quality
Textile material
4.3.1 Existing enterprise wastewater and initial rainwater pollutant components and concentrations shall be based on test data. When sampling and testing,
The waste water discharged from the process is sampled one by one and should be tested one by one, or mixed and sampled according to the proportion of water.
4.3.2 New (reformed, expanded) enterprise wastewater treatment projects can be compared with existing pollution production data of the same production scale and the same production process.
Determine the quality of wastewater, or calculate the water quality according to HJ 990.
4.3.3 When there is no measured data and reference information of similar enterprises, the comprehensive wastewater quality of textile dyeing and finishing enterprises can refer to Appendix A.
5 General requirements
5.1 General provisions
5.1.1 Textile dyeing and finishing enterprises should implement the concept of full-process control, prioritize the use of cleaner production technologies, improve resource and energy utilization, and reduce
Reduce the generation and discharge of pollutants.
5.1.2 The technical scheme of the textile dyeing and finishing wastewater treatment project shall be based on the production situation and development plan of the enterprise, and implement the national industrial policy.
Combining environmental factors such as climate in different regions, the overall planning of the relationship between concentration and decentralization, existing and new (expansion, reconstruction), and technical and economic demonstration
Ok.
5.1.3 The construction of textile dyeing and finishing wastewater treatment projects shall follow the "Regulations on Environmental Protection Management of Construction Projects" and the environmental impact assessment system.
In addition to complying with the provisions of this standard, it shall also comply with the national capital construction procedures and the relevant mandatory standards of the state and the textile industry.
5.1.4 Textile dyeing and finishing enterprises shall treat and reuse wastewater in accordance with the principles of “classified collection, quality treatment, and graded reuse”.
5.1.5 The textile dyeing and finishing wastewater treatment project shall discharge pollutants in accordance with the sewage discharge license it holds, and the discharged water quality and quantity shall conform to GB
4287 and local pollutant emission standards, as well as the requirements of environmental impact assessment approval documents.
5.1.6 Textile dyeing and finishing enterprises shall comply with the “Standardization Regulations for Sewage Outlets” (Trial)
Set relevant wastewater discharge outlets and install online monitoring facilities as required.
5.2 Source control
5.2.1 Textile dyeing and finishing enterprises shall select advanced technology and equipment in accordance with the requirements of the “Specification Conditions for the Printing and Dyeing Industry”, and preferentially adopt cleaner production.
Technology, improve the enterprise management system, meet the required energy consumption and fresh water consumption requirements, reduce the generation and discharge of pollutants.
5.2.2 Textile dyeing and finishing enterprises should improve the cooling water and condensate water recovery devices, equip the mercerizing process with a light alkali recovery device, and encourage the use of
Flow rinsing process, water reuse rate reached more than 40%.
5.2.3 Textile dyeing and finishing enterprises should choose to use grey cloth with biodegradable (or easy to recycle) slurry, using ecological and environmental protection, high dyeing rate
Dyes and high-performance additives.
5.3 Construction scale
5.3.1 The construction scale of the textile dyeing and finishing wastewater treatment project shall be based on the amount of wastewater, and the increase in the amount of wastewater due to production fluctuations shall be considered. One
Generally, 1.2 times to 1.3 times the amount of wastewater can be used as the maximum water design and construction.
5.3.2 The construction scale of each treatment system of the textile dyeing and finishing wastewater treatment project shall meet the following requirements in addition to the relevant design requirements.
a) The wastewater treatment structure in front of the adjustment tank is calculated according to the maximum daily maximum flow rate;
b) The regulation pond and its subsequent wastewater treatment structures are calculated based on the maximum daily average flow;
c) The sludge treatment and disposal system is calculated based on the average daily flow rate;
d) The reuse water treatment system is determined based on the amount of water reused. The scale of the reuse water treatment should be 1.1 times to 1.5 times the amount of recycled water.
Design and construction.
5.4 Project Site Selection and General Arrangement
5.4.1 The site selection and overall arrangement of the textile dyeing and finishing wastewater treatment project shall comply with the relevant regulations of GB 50014 and GB 50187.
5.4.2 The overall layout of the textile dyeing and finishing wastewater treatment project shall be based on the function of the treatment unit and the requirements of the treatment process, combined with the terrain and geological conditions.
And other factors are determined through technical and economic analysis, and should be convenient for construction, maintenance and management.
5.4.3 The general plan layout should be reasonably divided according to process flow and processing functions, and can be divided into pre-processing area, comprehensive processing area, and reuse processing
Area, sludge treatment area, chemical storage area and office area.
5.4.4 The layout of the processing unit should be compact and reasonable to meet the requirements of construction, equipment installation, simple and convenient connection of various pipelines, and maintenance management.
Convenient requirements.
5.4.5 The vertical design of the processing unit shall make full use of the original terrain and height difference, try to achieve earthwork balance as far as possible, and reduce gravity gravity.
Energy consumption.
5.5 Project Composition
5.5.1 The project of the textile dyeing and finishing wastewater treatment project consists of the main project, auxiliary projects and supporting facilities.
5.5.2 Main works include. wastewater collection and regulation, pretreatment, physical and chemical treatment, biochemical treatment, advanced treatment, reused water treatment, sewage treatment
Facilities and buildings (such as sludge treatment, secondary pollution control).
5.5.3 Ancillary works include. electrical automation, water quality online monitoring, water supply and drainage, fire protection, heating, ventilation and air conditioning.
5.5.4 Ancillary facilities include. control room, duty room and laboratory.
6 Process design
6.1 General
6.1.1 Prior to the process design, a comprehensive survey of the water quality, quantity and change of wastewater should be conducted, and necessary process tests conducted.
6.1.2 According to the water quality characteristics, discharge standards, reuse requirements and other factors of wastewater, advanced and applicable new technologies and new technologies should be actively used.
Technology, new materials, new equipment, technical and economic comparisons to determine the appropriate process route.
6.1.3 Some high-concentration organic wastewater or wastewater containing special pollutants produced during the textile dyeing and finishing process shall be collected separately and processed.
Pretreatment to ensure that its water quality does not affect the normal operation of the integrated wastewater treatment system after pretreatment.
6.1.4 The integrated wastewater treatment of textile dyeing and finishing should adopt a combined treatment process combining biochemical treatment with physical and chemical treatment, which has high requirements on emissions.
Where there is a requirement for reuse, further in-depth treatment or reuse treatment should be performed to meet the corresponding effluent quality requirements.
6.1.5 Textile dyeing and finishing wastewater containing hexavalent chromium should be collected and treated at the discharge of the production workshop or production facility. The hexavalent chromium in the wastewater reaches GB
The discharge limit of 4287 was discharged into the integrated wastewater collection pipe network.
6.1.6 During the wastewater treatment process, as far as possible, agents with less secondary pollution should be selected, and the utilization rate should be increased and the dosage of agents should be reduced.
6.1.7 An emergency accident pool should be set up in the wastewater treatment project. The volume of the emergency accident pool should comprehensively consider the maximum drainage capacity at the time of the accident,
The amount of fire fighting water and the rainfall that may enter the emergency pool. The accident water should be detected and classified before entering the corresponding treatment facilities.
6.2 Process selection
6.2.1 Wastewater treatment goals should be determined according to the source and nature of pollutants, current national and local relevant discharge standards, and reuse requirements.
Select the corresponding treatment process, the general process flow diagram is shown in Figure 2.
Figure 2 Schematic diagram of wastewater treatment process in textile dyeing and finishing industry
6.2.2 Comprehensive wastewater meets indirect discharge requirements after conventional treatment, and meets direct discharge requirements after conventional and advanced treatment.
6.2.3 According to the requirements of the quality and quantity of reused water, the low-concentration organic waste water after decontamination and shunting can be directly reused after treatment, or comprehensively
The wastewater is reused after conventional treatment and combined treatment.
6.3 Pretreatment process
6.3.1 The high-concentration organic waste water produced in textile dyeing and finishing production should adopt the following pretreatment process.
a) Washing wastewater. centrifugal recovery of lanolin;
b) Hemp degumming wastewater. processes such as anaerobic treatment;
c) Polyester alkali reduction wastewater. alkali recovery and acid precipitation to recover terephthalic acid;
d) Desizing and refining wastewater. anaerobic, chemical oxidation, iron-carbon micro-electrolysis;
e) Wax dyeing and washing wastewater. acid precipitation, air flotation to recover rosin;
f) PVA desizing wastewater. PVA is recovered by hot ultrafiltration concentration or salting out gel method.
6.3.2 The waste water containing special pollutants produced in textile dyeing and finishing production should adopt the following pretreatment process.
a) High ammonia nitrogen printing wastewater. stripping, stripping, etc .;
b) Carbonized acid wastewater. acid-base neutralization;
c) Mercerizing wastewater. Alkali recovery device should be set up if the alkali solution concentration is higher than 40 g/L;
Apply or comprehensive utilization measures;
d) Chromium-containing dyeing and finishing wastewater. chemical reduction, chemical precipitation;
e) Antimony dyeing and finishing wastewater. polyferric sulfate coagulant for coagulation.
6.4 General wastewater treatment process
6.4.1 Conventional treatment processes for various types of dyeing and finishing integrated wastewater should adopt the technology of biological treatment as the main and physical and chemical treatment as the supplement.
a) Conventional treatment of woven cotton and cotton blended dyeing and finishing comprehensive wastewater should use the combination of pre-physical, biochemical, and post-chemical methods.
As shown in Figure 3;
Figure 3 Process flow chart for conventional treatment of woven cotton and cotton blended dyeing and finishing wastewater
b) The combined wastewater quality of knitted cotton and cotton blended dyeing and finishing, hemp dyeing and finishing, and chemical fiber dyeing and finishing is similar, and its conventional treatment should be used.
Biochemical combination process, the process flow is shown in Figure 4;
Figure 4 Process flow chart of conventional wastewater treatment for knitted cotton and cotton blended dyeing and finishing, hemp dyeing and finishing, and chemical fiber dyeing and finishing
c) The conventional treatment of wool dyeing and finishing comprehensive wastewater should adopt the combination of physical and chemical and biochemical processes, and the process flow is shown in Figure 5;
Fig. 5 Process flow of conventional treatment of wool dyeing and finishing comprehensive wastewater
d) Biological treatment process should be adopted for the conventional treatment of silk dyeing and finishing integrated wastewater. The process flow is shown in Figure 6;
Fig. 6 Flow chart of conventional treatment of silk dyeing and finishing comprehensive wastewater
e) The routine treatment of printing or batik integrated wastewater should adopt the physical and chemical biological nitrogen removal combined process. The process flow is shown in Figure 7;
Figure 7 Process flow chart of conventional treatment of printing or batik integrated wastewater
6.4.2 General wastewater treatment process requirements and technical parameters
6.4.2.1 Grills and screens
6.4.2.1.1 At least one grid with a grid size of 3 mm to 10 mm should be selected for the grid grid. The front grid of the pump should be determined according to the requirements of the pump.
6.4.2.1.2 When there are many short fibers and short fibers, filter equipment with cleaning function should be used at the inlet of the adjusting tank, and the gap of the screen should be 10
Mesh ~ 20 mesh.
6.4.2.2 Adjustment
6.4.2.2.1 The regulating tank should be designed as closed, and there should be ventilation facilities.
6.4.2.2.2 The effective volume of the adjustment tank shall take into account factors such as wastewater discharge laws, changes in water quality and quantity, production shifts, etc., based on changes in water quantity
The cumulative curve is determined by the graphic method. When no exact data is available, it should be designed based on the water retention time of 8 h to 16 h.
6.4.2.2.3 When the agitation tank is air-stirred, the air volume per 100 m3 of effective tank capacity should be designed according to 1.0 m3/min to 1.5 m3/min;
When using jet agitation, the power should be not less than 10 W/m3; when using a submersible (submersible) agitator, the design flow rate should be 0.15
m/s ~ 0.35 m/s.
6.4.2.2.4 The regulating tank shall be provided with automatic opening and closing of the liquid level of the lift pump and a liquid level alarm device.
6.4.2.2.5 If there is a water collecting well in front of the adjustment tank, the effective volume of the water collecting well should be 10 min ~ 30 min.
Water output design.
6.4.2.2.6 When the pH value of the wastewater is less than 6 or greater than 9, a pH adjustment tank should be set up.
6.4.2.2.7 The pH adjustment tank should be divided into two parts. coarse adjustment and fine adjustment. The residence time of each part should be designed according to 20 min ~ 30 min. Water can be used.
Force stirring, mechanical stirring or air stirring.
6.4.2.2.8 The integrated wastewater treatment system using biochemical treatment, when the temperature of the aerobic biological treatment system is greater than 35 ℃, the adjustment tank is lifted
Cooling device should be installed after the pump.
6.4.2.3 Coagulation
6.4.2.3.1 The selection and dosing amount of coagulant and coagulant should be determined according to coagulation test or with reference to the operating conditions of similar construction projects.
6.4.2.3.2 When the coagulation sedimentation process is used, the speed gradient G value of the mixing section is 300 s-1 to 500 s-1, and the mixing time is 30 s to 120 s; flocculation
The G value of the segment velocity gradient is 30 s-1 to 60 s-1, the G value and the reaction flow rate should be gradually increased from small to large, and the flocculation time is 20 min to 30 min.
6.4.2.4 Sedimentation/air flotation
6.4.2.4.1 The hydraulic load on the surface of the sedimentation tank should be 0.8 m3/(m2 · h) to 1.0 m3/(m2 · h), and the separation time should be 1.5 h to 3.0 h.
6.4.2.4.2 The design of the air-floating system shall refer to the relevant provisions of HJ .2007.
6.4.2.5 Hydrolytic acidification
6.4.2.5.1 The effective volumetric load for hydrolysis and acidification should be designed according to 0.7 kgCOD/(m3 · d) ~ 1.5 kgCOD/(m3 · d). The reactor design can be referred to
HJ 2047 related regulations.
6.4.2.5.2 When determining the hydrolytic acidification volume load based on the concentration and composition of major pollutants, the residence time should be based on the nature of the refractory pollutants
And the concentration is determined. For denim washing wastewater, the residence time is not less than 12 h; for silk, wool, knitting dyeing and finishing wastewater, the residence time
Not less than 16 h; for higher concentrations of cotton and polyester dyeing and finishing wastewater, the residence time is not less than 24 h.
6.4.2.6 Aerobic treatment
6.4.2.6.1 Aerobic treatment includes activated sludge method and biofilm method.
6.4.2.6.2 The biofilm treatment process should adopt the biological contact oxidation method. When denitrification is needed, pre-denitrification (A/O) biological denitrification should be used.
Nitrogen treatment process, sequential batch activated sludge process (SBR) and its improved process or oxidation ditch technology.
6.4.2.6.3 When the activated sludge method is used, the sludge load should be 0.30 kgCOD/(kgMLSS · d) to 0.50 kgCOD/(kgMLSS · d).
Design; when using biological contact oxidation method, the volume load should be 0.4 kg BOD5/[m
(Filling) · d] ~ 0.8 kgBOD5/[m
(Filler) d)
Design and check according to hydraulic retention time.
6.4.2.6.4 The oxygen demand should be calculated according to the five-day biochemical oxygen demand of the hydrolyzed acidified effluent, and checked according to the gas-water ratio of 15. 1 to 30. 1.
6.4.2.6.5 The sludge reflux ratio of the activated sludge method is generally 60% to 100%, to ensure that the concentration of sludge in the biochemical tank is 3 g/L to 5 g/L. use
In the pre-denitrification process, the internal circulation reflux ratio should be determined according to the nitrogen removal efficiency, and it should be.200% to 400%. When using multi-stage A/O denitrification
During the process, the number of settings and the proportion of water inflow at each level should be determined according to the nitrogen removal requirements.
6.4.2.6.6 The secondary sedimentation tank should be based on a surface load of 0.5 m3/(m2 · h) ~ 0.7 m3/(m2 · h) and a solid load of sludge of 60 kg/(m2 · d) ~ 150
kg/(m
· D), the design of precipitation time 2h ~ 4h.
6.4.2.7 Oxidative decolorization
6.4.2.7.1 Decoloration facilities should be provided for comprehensive wastewater treatment. Oxidative decolorization is usually adopted. Chlorine dioxide or ozone should be used for decoloration. Care should be taken.
Use chlorine and sodium hypochlorite that may cause secondary pollution as oxidative decoloring agents.
6.4.2.7.2 The design parameters of the decoloring process and related structures should be determined through experiments or refer to the survey results of similar enterprises.
6.4.2.8 The wastewater treatment efficiency of the main treatment unit shall be determined through experiments or analogous data of similar enterprises. When no data is available, each treatment system
Refer to Appendix B for pollutant removal rate.
6.5 Advanced treatment and reuse treatment process
6.5.1 The advanced treatment or reuse treatment process and technical parameters should pass the process test according to the quality of the water, discharge standards or reuse requirements.
Determined after technical and economic comparison. The choice of in-depth treatment or reuse treatment process should be considered in conjunction with the conventional treatment unit.
6.5.2 In general, the advanced treatment or reuse treatment process can be used coagulation sedimentation (or air flotation) method, chemical oxidation method, membrane
Separation method, membrane bioreactor (MBR), aerated biological filter method, biological activated carbon method, filtration method, adsorption method, etc.
One or several process combinations. Specific processes include.
a) For chemical oxidation process, ozone, ozone/ultraviolet, hydrogen peroxide, hydrogen peroxide/ultraviolet, Fenton or Fenton-like oxidation process can be selected.
Art, oxidation reaction time 2 h ~ 4 h;
b) For the adsorption process, granular activated carbon or powder activated carbon can be selected;
c) For the filtration process, a filter or a mechanical fiber disc filter can be selected.
6.5.3 The high-salt tail water produced by membrane separation can be properly treated by methods such as concentration and evaporation.
6.6 Water reuse system
6.6.1 General
6.6.1.1 When designing a reuse water system, the principles of “classified collection, quality treatment, and graded reuse” should be followed to reduce the concentration of organic wastewater or
The effluent after comprehensive wastewater treatment is used as raw water for reuse.
6.6.1.2 The reuse route of reclaimed water shall be mainly production water, supplemented by non-production water.
6.6.1.3 When recycled water is used for production water, it can be used directly or mixed with a certain proportion of fresh water. If the textile dyeing and finishing enterprise has its own
Prepare industrial water treatment facilities. Recycled water can also be used as source water for industrial water treatment facilities. Production test should be carried out before reuse water is used
Inspection to ensure that the corresponding product quality indicators meet the requirements.
6.6.2 Water quality requirements
6.6.2.1 When the recycled water is directly used as rinsing production water, the water quality shall meet the requirements for rinsing production water. Nothing special for textile dyeing and finishing enterprises
For special requirements, refer to Table C.1 in Appendix C to determine the water quality.
6.6.2.2 When the recycled water is directly used as the water for dyeing/printing production, its water quality shall meet the water quality requirements for dyeing and finishing production water. Textile Dyeing and Finishing Enterprise
When there are no special requirements in the industry, refer to Table C.2 in Appendix C to determine the water quality.
6.6.2.3 When the reused water is used for flushing the ground, flushing toilets, washing vehicles, greening, building construction, etc., the water quality shall meet GB/T
18920, GB/T 25499.
6.6.2.4 When the reused water is used for multiple purposes at the same time, its water quality should be determined according to the highest water quality standards.
6.6.3 Water reuse system
6.6.3.1 The reused water system includes raw water system, recycled water treatment system and recycled water supply system.
6.6.3.2 The original water tank shall be provided with the reuse water system. When the reuse water system is continuously operated, the adjusted volume of the original water tank shall be based on
Calculated from 20% to 30%; when the reuse water system is intermittently operated, the adjusted volume of the original pool should be calculated according to the process operation cycle.
6.6.3.3 According to the requirements of raw water quality and recycled water, the recycled water treatment process can be selected from the 6.5 processes and their combinations.
6.6.3.4 The process design of the reuse water system can be implemented with reference to GB 50335.
6.6.3.5 A fresh water storage tank should be provided in the reuse water system. The adjusted volume of the fresh water storage tank should be based on the recycled water treatment volume, recycled water volume, and
Design changes over time.
6.7 Sludge
6.7.1 The sludge with different properties shall be collected, stored and treated separately.
6.7.2 The amount of sludge produced can be calculated according to process conditions, or it can be determined with reference to similar enterprises.
6.7.3 The amount of biochemical sludge generated should be calculated based on the amount of wastewater water, organic matter concentration, and sludge yield coefficient. The amount of biochemical sludge generated should be based on
The calculation of wastewater water volume, suspended solids concentration, dosage of drugs, and removal rate of pollutants, etc., the specific calculation methods refer to GB 50013 and
GB 50014 is implemented.
6.7.4 The sludge concentration can adopt gravity concentration, mechanical concentration or air flotation concentration technology. When gravity concentration is used, the solid load of sludge should be
Using 20 kg/(m2 · d) ~ 40 kg/(m2 · d), the concentration time should be designed according to 16 h ~ 24 h, and the moisture content of the sludge after concentration should not be greater than 98%.
When mechanical enrichment is used, it should be confirmed after testing and technical and economic analysis according to the information provided by the equipment supplier and the operating data of similar enterprises.
set.
6.7.5 Before sludge dehydration, dosing and conditioning should be performed according to sludge characteristics and dehydration machinery. The type of agent should be based on the nature of the sludge and the dry sludge.
The treatment method is selected, and the dosage should be determined by experiments or by referring to the data of the same type of sludge dewatering project.
6.7.6 The type of sludge dewatering machine should be determined after technical and economic comparison based on sludge properties, sludge output, and dewatering requirements. Dewatering
The moisture content of the mud should meet the disposal requirements.
6.7.7 The dewatering sludge yard should be set up according to the different properties of the sludge to determine the different anti-seepage,
Leak-proof and rain-proof grade.
6.7.8 Dehydration sludge drying equipment should be selected according to needs. The heat source should be steam, and the moisture content of sludge should be reduced to 30% -40% after drying.
The sludge drying equipment should be sealed and insulated, and has an exhaust gas collection and treatment system. The sludge drying condensate should be discharged into a comprehensive wastewater conditioning tank or collection
well.
6.7.9 The clear liquid produced during the sludge concentration process, the filtrate produced during the dehydration process, and the exudate produced during stacking shall be set to collect
Pipeline, return to the integrated wastewater conditioning tank or water collection well.
6.7.10 The final disposal methods of sludge mainly include comprehensive utilization, incineration and landfill, etc. Textile dyeing and finishing enterprises should give priority to comprehensive utilization
Source reduction. The sludge disposal shall comply with the relevant national laws, regulations and standards.
6.8 Prevention of secondary pollution
6.8.1 General
6.8.1.1 Prevention and treatment of secondary pollutants such as malodor, solid waste and noise during construction and operation of textile dyeing and finishing wastewater treatment project
The national and local environmental protection laws and standards shall be implemented.
6.8.1.2 Wastewater treatment projects shall be provided with a place for storing materials, chemicals, sludge, waste residue, etc., and shall not be stored in the open air.
The storage site shall be treated with anti-seepage, rain-proof and spill-proof treatment.
6.8.1.3 The hazardous wastes or hazardous wastes listed in the National Hazardous Waste List shall be in accordance with GB 18597, HJ 2025, etc.
Relevant regulations for storage and disposal.
6.8.2 Stench Management
6.8.2.1 Collecting pools, conditioning tanks, hydrolytic acidification tanks, sludge storage tanks, sludge dewatering treatment rooms, etc.
Deodorizing treatment is performed.
6.8.2.2 The odor air volume of the wastewater treatment building (structure) should be based on the type of structure, the area of the water surface that emits the odor, and the odor space.
The factors such as product volume are comprehensively determined; the deodorization system should be separated from the ventilation system. When it is difficult to separate, the personnel need to enter and exit frequently.
For buildings (structures), the air extraction volume should be designed according to the number of ventilations no less than 6 times/h.
When required, temporary forced ventilation measures should be considered when people enter and exit.
6.8.2.3 The odor control system of wastewater treatment facilities should be composed of odor source cover, odor collection, odor treatment, and discharge after treatment.
6.8.2.4 The deodorization process should be a combination of physical, chemical and biological methods. Common deodorization processes include adsorption, absorption,
Catalytic oxidation, low-temperature plasma deodorization, biological washing or biological filtration. It is also possible to take sprays to ensure that the discharge requirements are met.
Sprinkle plant extracts and other mitigation measures.
6.8.2.5 The malodorous pollutants discharged from the odor treatment facilities shall meet the requirements of GB 14554.
6.8.2.6 The layout of the odor treatment device should be as close as possible to the building (structure) with a large amount of odor air. The number of devices should be based on the odor
Factors such as the air volume, the location of the odor gas source, the location of the device discharge port and the sensitive facilities, and the operation management are comprehensively determined.
(Structure) When the layout of buildings is scattered, partition processing can be adopted.
6.8.3 Prevention of noise pollution
6.8.3.1 The equipment room shall have good sound insulation or sound absorption design to ensure that the environmental noise at the plant boundary meets the standards.
6.8.3.2 The installation of machinery and equipment should consider noise and vibration control measures such as vibration reduction, sound insulation, and noise reduction; high noise sources such as blowers
And water pumps should be specially equipped with sound insulation and mufflers.
7 Main process equipment and materials
7.1 General
7.1.1 The selection of equipment and materials shall consider energy saving, environmental protection, safety and reliability, corrosion resistance and service life.
7.1.2 The selected equipment should meet the safety requirements of fire prevention, explosion protection, moisture resistance and dust prevention.
7.2 Grille
7.2.1 A mechanical grille with automatic cleaning function should be used.
7.2.2 The mechanical grille shall be provided with facilities to facilitate lifting during maintenance and safety facilities such as slag outlet platforms and railings.
7.3 Water pump
7.3.1 The type and number of sewage pumps should be selected according to the flow, nature and lift required of the sewage being lifted.
7.3.2 The pump of the same type and caliber should be selected as much as possible for maintenance, but it should also meet the needs at low flow rates.
7.3.3 An appropriate amount of standby pump should be set for the water pump, and the standby pump should be configured according to 1 for 1 reserve or 2 for 1 reserve.
7.3.4 Submersible sewage pumps shall comply with the requirements of HJ/T 336.
7.4 Dosing coagulation reaction device
7.4.1 The mixing and reaction of coagulant and wastewater should be mechanical stirring or hydraulic stirring.
7.4.2 The dosing device shall implement automatic operation control.
7.5 Blower
7.5.1 The blower should use low-noise, high-efficiency and low-consumption products, and the outlet wind pressure should be stable. Roots blowers should be used.
7.5.2 The air supply volume, air supply pressure of the blower and the power of the motor shall meet the biological reaction aerobic requirements of the wastewater treatment system, the physical and chemical tank
Air stirring and other gas volume requirements. The blowers for biochemical oxygen supply and physical and chemical agitation should be arranged separately.
7.5.3 The blower shall be set for backup. When there are less than four blowers, one should be set up for backup; when there are not less than four blowers, two should be set up
spare.
7.6 Aeration equipment
7.6.1 Products with high oxygen utilization coefficient, good mixing effect, reliable quality, small resistance loss and easy installation and maintenance shall be selected.
7.6.2 Blast aerators shall comply with the provisions of HJ/T 252.
7.7 Filler
7.7.1 Hanging packing shall meet the requirements of HJ/T 245.
7.7.2 Suspended fillers shall meet the requirements of HJ/T 246.
7.8 Sludge dewatering machine
7.8.1 The number of sludge dewatering machines shall be determined according to the maximum amount of dry sludge to be treated, and shall not be less than two.
7.8.2 Chamber filter presses and plate and frame filter presses for sludge dewatering shall meet the requirements of HJ/T 283. Belt press filters for sludge dewatering
Meet the requirements of HJ/T 242.
7.8.3 Other types of sludge dewatering machines shall comply with relevant regulations.
8 Inspection and process control
8.1 General
8.1.1 The textile dyeing and finishing wastewater treatment project should set up a laboratory and configure corresponding testing instruments and equipment.
8.1.2 Instruments and meters such as water quantity measurement, water level observation, water quality detection, and medicine measurement shall be set according to the treatment process and management requirements.
8.1.3 An automatic control system for wastewater treatment shall be set up, and the instruments and automatic control systems shall have functions such as anti-corrosion, anti-scaling, and self-cleaning.
8.2 Inspection
8.2.1 The main parameters of the wastewater treatment project should be tested regularly, and the key control indicators should be tested online.
8.2.2 On-line testing devices used to provide data for closed-loop control and performance evaluation of wastewater treatment projects, their testing points should be set separately
In the controlled unit or at the entrance and exit, the sampling frequency and testing items should be determined according to process control requirements.
8.2.3 The hydrolysis acidification treatment unit should detect the pH value, temperature, redox potential, COD, BOD5, volatility of the wastewater inlet and outlet.
Fatty acid (VFA) and indicators of alkalinity, sludge properties and sludge concentration in the reactor; aerobic treatment units should detect wastewater in and out
PH value, temperature, ammonia nitrogen, total nitrogen, total phosphorus, COD, BOD5 and dissolved oxygen, sludge properties and sludge concentration in the reactor
Degree and other indicators.
8.2.4 Wastewater flow, dissolved oxygen, pH value, temperature, water level, redox potential, and COD should be measured online.
8.3 Process control
8.3.1 Enterprises with conditions shall set up a central control room in the textile dyeing and finishing wastewater treatment project, and adopt centralized management monitoring or decentralized control.
The computer control system is equipped with a complete control system and an online automatic monitoring device for the treatment facilities.
8.3.2 The dosing system should automatically control the dosing amount according to the process setting parameters.
8.3.3 The wastewater treatment station shall set up liquid level controllers in the pools such as the adjustment tank, emergency pool, and clear water pool according to the process requirements,
Should meet the requirements of automatic and manual control of pump start and stop.
9 Major auxiliary works
9.1 Architecture and Structure
9.1.1 The design, anticorrosion, daylighting and structure of the factory building shall meet the requirements of GB 50033, GB 50037, GB/T 50046 and other standards.
9.1.2 Different structural forms may be adopted according to the differences in climatic conditions in different regions. Anti-freezing measures shall be taken for building structures in severe cold regions.
9.1.3 Wastewater treatment buildings (structures) shall be provided with drainage facilities. The discharged water shall be collected and returned to the conditioning tank to enter the treatment system.
9.1.4 Guardrails shall be provided for open underground structures (structures) and above-ground structures (structures). The height of the railing shall not be less than 1.2m, and shall be
Set the footguards.
9.2 Electrical
9.2.1 The technical requirements of the electrical specialty of wastewater treatment engineering should be consistent with the technical requirements in the production process, and the connection and operation of the working power supply
The setting of the room should be considered in coordination with the production process, and the high and low voltage levels and the neutral point of the power consumption should be consistent with the production equipment.
9.2.2 The power supply of the independent treatment plant (station) should be designed according to the secondary load. The power supply level of the treatment plant (station) in the dyeing and finishing plant should be the same as that of the production workshop.
equal.
9.2.3 The design of the substation shall meet the requirements of GB 50053 and GB 50059.
9.2.4 The design of power supply and distribution shall comply with the relevant regulations of GB 50052, GB 50054, GB 50055, GB 50057.
9.2.5 The safety of power supply and consumption at the construction site shall meet the requirements of GB 50194.
9.2.6 The controllers and power distribution screens supplied with complete sets of equipment shall meet the requirements of environmental conditions, and shall also meet GB 14048 and GB/T
22580 related provisions.
9.3 Air conditioning and HVAC
9.3.1 Ventilation facilities shall be set up in underground workshops (structures), as well as in the process workshops that produce harmful gases such as dispensing rooms and sludge dewatering rooms.
9.3.2 The design of the heating system of the wastewater treatment project should be unified with the production system. The heat source should be provided by the heating system in the plant area.
9.3.3 Wastewater treatment engineering buildings shall have heating, ventilation and air conditioning systems, and shall comply with the regulations of GB 50019, GB 50243, etc.
set.
9.4 Water supply and drainage and fire protection
9.4.1 The wastewater supply and drainage and fire protection systems of wastewater treatment projects shall be considered in coordination with the production system. The design of water supply and drainage shall comply with GB 50013,
GB 50014 and GB 50015.
9.4.2 The drainage of wastewater treatment projects should generally be discharged by gravity flow.
9.4.3 The fire protection design, fire hazard category, fire resistance level and fire protection system setting of wastewater treatment projects shall comply with GB 50016 and other regulations.
Related standard:   HJ 519-2020  HJ 945.3-2020
   
 
Privacy   ···   Product Quality   ···   About Us   ···   Refund Policy   ···   Fair Trading   ···   Quick Response
Field Test Asia Limited | Taxed in Singapore: 201302277C | Copyright 2012-2020