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Detail Information of HJ 2024-2012; HJ2024-2012
Description (Translated English): Technical specifications for completely mixed anaerobic reaction tank in wastewater treatment
Sector / Industry: Environmental Protection Industry Standard
Word Count Estimation: 20,269
Date of Issue: 12/24/2012
Date of Implementation: 3/1/2013
Quoted Standard: GB 3096; GB 12348; GB 12801; GB 18597; GB 18599; GB 50014; GB 50015; GB 50016; GB 50040; GB 50053; GB 50187; GB 50204; GB 50222; GB 50231; GB 50268; GB 50141; GBJ 87; GBZ 1; GBZ 2.1; GBZ 2.2; CJ 3025; CJJ 60; CJ/T 51; JGJ 37; HJ/T 91; HJ/T 242; HJ/T 279;
Drafting Organization: China Environmental Protection Industry Association
Regulation (derived from): Ministry of Environmental Protection Notice 2012 No. 72
Summary: This standard specifies the process design completely mixed anaerobic wastewater treatment tank, the main equipment, testing and control, construction and acceptance, operation and maintenance of technical requirements. This standard applies to the use of

HJ 2024-2012
Technical specifications for completely mixed anaerobic reaction tank in wastewater treatment
National Environmental Protection Standard of the People's Republic
Fully mixed anaerobic reaction cell
Wastewater treatment engineering technical specification
Technical specifications for completely mixed anaerobic reaction tank
In wastewater treatment
Published on.2012-12-24
2013-3-1 implementation
Ministry of Environmental Protection released
Content
Preface II
1 Scope..1
2 Normative references..1
3 Terms and definitions. 2
4 Design water quantity and design water quality 3
5 General requirements..4
6 Process Design..5
7 Detection and process control 14
8 Major auxiliary projects.15
9 Construction and acceptance..16
10 Operation and maintenance 18
Foreword
To implement the Law of the People's Republic of China on Water Pollution Prevention and Control, standardize the complete mixed anaerobic reaction tank in wastewater treatment
Application, prevention of water pollution, protection of human health, the development of this standard.
This standard specifies the process design, main equipment, testing and control, construction and acceptance of a fully mixed anaerobic reactor.
Technical requirements for operation and maintenance.
This standard is a guiding standard.
This standard is the first release.
This standard was formulated by the Science and Technology Standards Department of the Ministry of Environmental Protection.
This standard is mainly drafted by. China Environmental Protection Industry Association, Harbin Institute of Technology, Dalian Nationalities College, Tsinghua University
University, Harbin Engineering University, Shaoxing Water Conservancy Construction Engineering Co., Ltd., Beijing Municipal Environmental Protection Research Institute.
This standard was approved by the Ministry of Environmental Protection on December 24,.2012.
This standard has been implemented since March 1,.2013.
This standard is explained by the Ministry of Environmental Protection.
Complete mixed anaerobic reaction tank wastewater treatment engineering technical specification
1 Scope of application
This standard specifies the process design, main equipment, testing and control of the complete mixed anaerobic reaction tank wastewater treatment project.
Technical requirements for construction and acceptance, operation and maintenance.
This standard is applicable to high suspended solids and high concentration organic wastewater treatment projects using fully mixed anaerobic reaction tanks.
Environmental impact assessment and environmental engineering design, construction, environmental protection acceptance and technical basis for operation and management after completion.
2 Normative references
The contents of this standard refer to the terms in the following documents. For undated references, the valid version applies to this
standard.
GB 3096 Acoustic Environmental Quality Standard
GB 12348 industrial enterprise boundary environmental noise standard
General rules for safety and health requirements of GB 12801 production process
GB 18597 Hazardous Waste Storage Pollution Control Standard
GB 18599 General industrial solid waste storage and disposal site pollution control standards
GB 50014 Outdoor Drainage Design Code
GB 50015 Building Water Supply and Drainage Design Code
GB 50016 Building Design Fire Code
GB 50040 power plant basic design specification
GB 50053 10KV and below substation design specifications
GB 50187 General Plan for Design of Industrial Enterprises
GB 50204 Concrete Structure Engineering Construction Quality Acceptance Specification
GB 50222 Building interior decoration design fire protection specification
General specification for construction and acceptance of GB 50231 mechanical equipment installation engineering
GB 50268 Water supply and drainage pipeline engineering construction and acceptance specifications
GB 500141 Water supply and drainage structures construction and acceptance specifications
GB J 87 Industrial Enterprise Noise Control Design Specification
GBZ 1 industrial enterprise design hygiene standard
GBZ 2 workplace occupational exposure limit
CJ 3025 Urban sewage treatment plant sewage sludge discharge standard
CJJ 60 Urban Wastewater Treatment Plant Operation, Maintenance and Safety Technical Regulations
CJ/T 51 Standard for urban sewage quality inspection methods
JGJ 37 General Rules for Civil Building Design
HJ/T 91 Surface Water and Wastewater Monitoring Technical Specifications
HJ/T 242 environmental protection product technical requirements belt press filter for sludge dewatering
HJ/T 279 environmental protection product technical requirements push flow submersible mixer
HJ/T 283 environmental protection product technical requirements chamber filter press and plate and frame filter press
HJ/T 335 environmental protection product technical requirements sludge concentration belt dewatering machine
NY-T 1220 Biogas Engineering Technical Specification
NY/T 1220.1 Technical Specifications for Biogas Engineering Part 1. Process Design
NY/T 1220.2 Technical Specifications for Biogas Engineering - Part 2. Gas Supply Design
SHT 3535 Petrochemical Concrete Pool Construction and Acceptance Specifications
Measures for the Administration of Environmental Protection Acceptance for Completion of Construction Projects (Order No. 13 of the State Environmental Protection Administration)
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1 Completely mixed anaerobic reaction tank completely mixed anaerobic reaction tank
Refers to the installation of a stirring device in the sewage treatment reaction tank to complete the high-concentration organic wastewater and anaerobic microorganisms
An anaerobic wastewater biological treatment unit that is fully mixed to degrade organic contaminants in wastewater and remove suspended solids.
3.2 Complete mixed anaerobic reaction tank wastewater treatment process without sludge reflux
Completely mixed anaerobic reaction tank in wastewater treatment without return sludge
Refers to high-suspension high-concentration organic wastewater pretreated by grid and primary sedimentation tank, and then treated by fully mixed anaerobic reaction tank.
The effluent enters the degassing device and the sedimentation tank and other subsequent treatments, and there is no process of returning the sludge to the fully mixed anaerobic reaction tank.
3.3 Complete mixed anaerobic reaction tank wastewater treatment process with sludge reflux
Completely mixed anaerobic reaction tank in wastewater treatment with return sludge
Refers to high-suspension high-concentration organic wastewater pretreated by grid and primary sedimentation tank, and then treated by fully mixed anaerobic reaction tank.
The effluent enters the deaerator and the sedimentation tank and other subsequent treatments, and the precipitated sludge in the sedimentation tank is partially returned to the fully mixed type.
Oxygen reaction cell to increase the biomass of the process.
3.4 normal temperature anaerobic reaction
The reaction cell temperature is controlled by an anaerobic reaction at 25 °C to 30 °C.
3.5 medium temperature anaerobic reaction mesophilic anaerobic reaction
The reaction cell temperature is controlled by an anaerobic reaction at 35 °C to 40 °C.
3.6 high temperature anaerobic reaction thermophilic anaerobic reaction
The reaction cell temperature is controlled by an anaerobic reaction at 45 °C to 55 °C.
4 Design water quantity and design water quality
4.1 Design water quantity
4.1.1 The designed water volume shall be designed according to the actual sewage flow measured at the total discharge of the plant or industrial park. Test method should be consistent
HJ/T 91 regulations.
4.1.2 The change of wastewater flow rate should be measured according to the characteristics of the process, and the flow coefficient of variation should be determined.
4.1.3 When the actual measurement data cannot be obtained, it can be determined by reference to the relevant provisions of the current national industrial water consumption, or
The same industry scale is the same as the existing plant drainage data of the process.
4.1.4 Domestic sewage and bathing wastewater in the factory or in the industrial park should directly enter the subsequent aerobic treatment unit. Stain
The determination of the amount of water and the amount of bathing water shall comply with the relevant provisions of GB 50015.
4.1.5 Lifting pump house, grid well, grit chamber, and primary settling tank should be calculated according to the highest daily maximum wastewater volume.
4.1.6 The design flow of the fully mixed anaerobic reactor should be designed according to the highest daily average.
4.1.7 Water supply facilities such as pumps and pipelines before and after a fully mixed anaerobic reaction tank shall be designed according to the highest daily maximum wastewater volume.
4.2 Design water quality
4.2.1 Influent water quality should be determined based on actual monitoring data or extensive reference to design operating parameters of similar plants.
4.2.2 The influent water quality can be weighted average of the corresponding flow of the continuous sampling monitoring data for 5 days and 24 hours at the total inlet, or
Obtain data in accordance with relevant regulations.
4.2.3 When there is no engineering survey data, the design water quality can be determined by referring to the relevant provisions of GB 50014.
4.2.4 The influent water quality of the fully mixed anaerobic reaction tank should meet the following conditions.
a) pH should be 6.5 ~ 7.5;
b) The ambient temperature anaerobic reaction temperature should be 25 °C ~ 30 °C, the intermediate temperature anaerobic reaction temperature should be 35 °C ~ 40 °C, high temperature annoyance
The oxygen reaction temperature is preferably 45 ° C ~ 55 ° C;
c) the nutritional combination ratio (CODCr. NH3-N. P) should be 100 ~ 500. 5. 1;
d) the ratio of BOD5/CODCr should be greater than 0.3;
e) the concentration of ammonia nitrogen in the influent water should be less than.2000 mg/L;
f) the concentration of sulfate in the influent water should be less than 3000 mg/L;
g) The concentration of CODCr in the influent water should be greater than 1000 mg/L;
h) Strictly control the concentration of heavy metals, cyanides, phenols and other substances into the fully mixed anaerobic reactor.
4.2.5 If the influent water quality does not meet the requirements, appropriate pretreatment measures should be adopted.
4.2.6 Completely mixed anaerobic reaction tank treatment process When the effluent is directly discharged, it should meet the requirements of national and local discharge standards;
When discharging into the next-stage treatment system, the water inlet requirements of the next-stage treatment system should be met.
4.3 Pollutant removal rate
The pollutant removal rate of the fully mixed anaerobic reaction tank can be referred to Table 1.
Table 1 Removal rate of pollutants in a fully mixed anaerobic reactor
Pollutant Index Chemical Oxygen Demand (CODCr) 5 Day Biochemical Oxygen Demand (BOD5) Suspended Solids (SS)
Removal rate (%) 70~90 60~80 80~90
5 General requirements
5.1 Completely mixed anaerobic reaction tank process is suitable for high suspended solids high concentration organic wastewater treatment project, suitable for including but not
Limited to sewage (waste) water treatment in the following industries. animal husbandry, food manufacturing, paper industry, meat processing industry, sugar industry,
Fermentation and brewing industry, pharmaceutical industry, textile dyeing and finishing industry, etc.
5.2 The sewage treatment plant (station) using the fully mixed anaerobic reactor process shall comply with the following regulations.
a) The choice and overall layout of the sewage treatment plant (station) address should comply with the relevant provisions of GB 50014. General plan design should
Meet the relevant provisions of GB 50187.
b) The flood control standard of the sewage treatment plant (station) should not be lower than the urban flood control standard and have good drainage conditions.
c) The fire protection design of the sewage treatment plant (station) shall comply with the provisions of GB 50016 and GB 50222.
d) The storage yard for sludge and drugs deposited in the sewage treatment plant (station) shall comply with the provisions of GB 18597 and GB 18599.
e) Exhaust gas, waste water, waste residue, noise and other pollutants generated during the construction and operation of sewage treatment plants (station)
The governance and discharge shall comply with the relevant provisions of national environmental protection regulations and standards to prevent secondary pollution. During the operation
The biogas produced should be comprehensively utilized, and the biogas safety should comply with the provisions of NY-T 1220.
f) The design and construction of the project should adopt effective noise reduction, noise reduction, greening and other measures to reduce noise, noise and vibration control.
The design of the system shall comply with the provisions of GB J 87 and GB 50040. The noise inside and outside the equipment room shall comply with GBZ 2 and GB 3096 respectively.
The provisions of the factory boundary noise should comply with the provisions of GB 12348.
g) occupational health and labor safety should be highly valued during the design, construction and operation of sewage treatment plants (stations).
The grid implements the provisions of GBZ 1, GBZ 2 and GB 12801.
h) Sewage treatment plants (stations) should consider emergency measures for pollution prevention in abnormal situations such as production accidents.
i) The building (structure) shall be provided with the necessary protective railings and appropriate anti-slip measures shall be in accordance with JGJ 37.
j) It is advisable to set up the detection and control system according to the requirements of the process operation to realize the automation of operation management.
5.3 Sewage treatment plants (stations) shall install online monitoring systems and treatment facilities in accordance with national or local environmental protection management requirements.
Central control system.
6 Process design
6.1 General requirements
6.1.1 According to the influent water quality, an appropriate pretreatment process should be adopted before the fully mixed anaerobic reaction tank to make the anaerobic anti-
The best operating conditions should be achieved within the pool.
6.1.2 Stirring and other measures should be taken to ensure that the flow state in the fully mixed anaerobic reaction tank is completely mixed.
6.1.3 When the quality of industrial wastewater changes greatly with the production process, facilities for regulating water quality and quantity should be set up.
6.1.4 Process design should take into account the effects of water temperature.
6.1.5 The grille shall be provided before the water inlet system. The design of the inlet pump house and the grille shall comply with the relevant provisions of GB 50014.
6.1.6 The number of cells (grid) of each treatment structure shall not be less than 2 (divisions) and shall be designed in parallel.
6.1.7 The reaction cell should be heated to ensure that the fully mixed anaerobic reactor is maintained at the required temperature.
6.2 Process
6.2.1 Sewage treatment plant (station) using a fully mixed anaerobic reaction tank wastewater treatment process without sludge reflux
The process flow is shown in Figure 1.
Pre-processed fully mixed
Anaerobic reaction cell
Influent
Biogas purification and utilization
Sludge treatment
Water
Degasser sedimentation tank
Fig.1 Process flow of complete mixed anaerobic reaction tank wastewater without sludge reflux
6.2.2 Sewage treatment plant (station) using a fully mixed anaerobic reaction tank wastewater treatment process with sludge reflux
The process flow is shown in Figure 2.
Pre-processed fully mixed
Anaerobic reaction cell
Influent
Biogas purification and utilization
Sludge treatment
Degasser
Water
Sludge backflow
Sedimentation tank
Figure 2 Process flow of complete mixed anaerobic reaction tank wastewater with sludge reflux
6.3 Pretreatment
6.3.1 Pretreatment of the complete mixed anaerobic reaction tank wastewater treatment process includes grid, grit chamber, primary settling tank, regulating tank and
Mix heating pools or cooling facilities.
Mixed
Hot pool or
Cooling Tower
Enter complete mixing
Anaerobic reaction cell
pH, temperature regulation, nutrient salt dosing
Legend. Recommended process unit optional process unit
Figure 3 Pretreatment process
6.3.2 Thick and fine grids should be provided as needed. The design of the grille shall comply with the provisions of GB 50014.
6.3.3 A grit chamber should be provided. The design of the grit chamber should comply with the provisions of GB 50014.
6.3.4 The primary sinking tank should be set. The design of the primary sedimentation tank shall comply with the provisions of GB 50014.
6.3.5 The adjustment pool should be set. The design of the conditioning tank should meet the following requirements.
a) The capacity of the adjustment tank should be determined according to the curve of the sewage flow; when there is no flow curve, the capacity of the adjustment tank should be full.
For the requirement of homogenization of water quality and quantity in the production drainage cycle, the residence time should be 8 h to 12 h; if it is intermittent operation, adjust the tank capacity.
The amount should be set in 1~2 cycles;
b) It is advisable to set up a nutrient salt replenishing device in the adjustment tank, which can also be used as a neutralization tank;
c) The mixing facility should be set in the adjustment tank, and the mixer power should be 4 W/m3 to 8 W/m3;
d) The slag removal device shall be installed at the outlet end of the adjustment tank, and the sand removal and sludge discharge device shall be installed at the bottom of the tank.
6.3.6 The pH adjustment and nutrient salt dosing device should be located in the dosing room and should be designed to meet the following requirements.
a) Adjust and control the pH in the fully mixed anaerobic reaction tank by adding alkaline or acidic substances, alkaline substances
Na2CO3, NaHCO3, NaOH, etc. may be used; hydrochloric acid, sulfuric acid, etc. may be selected for the acidic substance;
b) The pharmacy should have a certain amount of storage, the storage of acidic substances should be more than 7 days, and the storage of alkaline substances should be 15 days.
on;
c) It is advisable to use a special solvent-dissolving tank and mixing equipment for the dissolution of the drug, and the metering pump should be used for automatic quantitative dosing;
d) It is advisable to first add acidic or alkaline substances to the conditioning tank for coarse pH adjustment, and then use a pipe mixer and quantitative
Acid and alkali pump for fine adjustment of pH;
e) It is advisable to set up a drug dissolving and dosing device such as nutrient salt (nitrogen, phosphorus, etc.) in the dosing room.
6.3.7 If the temperature of the wastewater does not meet the design temperature requirements, a heating or cooling device shall be provided. The specific requirements are as follows.
a) There are two ways of heating outside the pool and heating in the pool. There are two ways of heating outside the pool and heating in the pool.
The heating in the pool should be heated by hot water circulation;
b) The heat exchanger selection shall be based on the characteristics of the wastewater, the temperature of the medium and the temperature of the outlet medium of the heat exchanger. Heat exchanger exchange
The thermal area should be calculated according to the heat balance, and the calculation result should have a margin of 10% to 20%;
c) The heat demand of the heating device is calculated as follows.
Dht QQQ = (1)
In the formula.
Qt--total heat demand, kJ/h;
Qh--heat required to heat the sewage to the design temperature, kJ/h;
Qd - the amount of heat required to maintain the temperature of a fully mixed anaerobic reactor, kJ/h.
d) Cooling facilities or cooling towers should be used for cooling facilities.
6.3.8 After the pre-treatment of the influent water, the influent requirements of the 4.2.4 fully mixed anaerobic reaction tank shall be met.
6.4 Completely mixed anaerobic reaction cell
6.4.1 Pool type
6.4.1.1 The basic pool type of the fully mixed anaerobic reaction tank is cylindrical and egg type, as shown in Figure 4.
(a) Cylindrical (b) egg type
Figure 4 Schematic diagram of a fully mixed anaerobic reactor pool
6.4.1.2 The cylindrical full-mixing anaerobic reaction tank has a ratio of diameter D to height H of about 1, and a diameter of generally 6 m to 35 m.
The inclination angle of the bottom and the pool cover is 15°-20°; the ratio of the long axis height H to the short axis diameter D of the egg type fully mixed anaerobic reaction tank is preferably 1.4~
Between 2.0.
6.4.2 Volume
6.4.2.1 Fully mixed anaerobic reactor tank volume without sludge backflow
6.4.2.1.1 Using the kinetic coefficient method, the sludge age (θc) is equal to the hydraulic retention time, and the fully mixed anaerobic reaction tank is effective.
The volume is calculated as follows.
cQV θ= .(2)
In the formula.
V--full mixed anaerobic reaction tank volume without sludge reflux, m3;
Q--Design flow rate of complete mixed anaerobic reaction tank without sludge reflux, m3/d;
Θc--sludge age (SRT), generally 3 d to 7 d.
6.4.2.1.2 Calculate the volume of the fully mixed anaerobic reaction tank using the volumetric load method as follows.
VN
QCV 01000= (3)
In the formula.
V--full mixed anaerobic reaction tank volume without sludge reflux, m3;
Q--Design flow rate of complete mixed anaerobic reaction tank without sludge reflux, m3/d;
C0--CODcr concentration of complete mixed anaerobic reaction tank without sludge reflux, mg/L;
NV--volume load, normal temperature anaerobic reaction generally takes 1 kg COD/(m3·d)~3 kg COD/(m3·d), moderate temperature anaerobic
The oxygen reaction generally takes 3 kg COD/(m3·d)~10 kg COD/(m3·d), and the high temperature anaerobic reaction generally takes 10 kg COD/(m3·d).
~15 kg COD/(m3·d).
6.4.2.1.3 When the volume of the fully mixed anaerobic reaction tank is designed according to the sludge load, it is calculated as follows.
XN
QCV
01000= (4)
In the formula.
V--full mixed anaerobic reaction tank volume without sludge reflux, m3;
Q--Design flow rate of complete mixed anaerobic reaction tank without sludge reflux, m3/d;
C0--the concentration of CODCr in the complete mixed anaerobic reaction tank without sludge reflux, mg/L;
NS--sludge load, kg COD/(kgMLVSS·d);
X--Sludge concentration in a fully mixed anaerobic reactor without sludge reflux, mg MLVSS/L.
6.4.2.2 Fully mixed anaerobic reaction tank volume with sludge reflux
6.4.2.2.1 When the volume of a fully mixed anaerobic reaction tank with sludge backflow is designed according to the kinetic coefficient, it shall be calculated as follows.
)1(
) ( 0
eC
bX
CCYQV θ
−= .(5)
In the formula.
V--the volume of the fully mixed anaerobic reaction tank with sludge reflux, m3;
X--Sludge concentration in a fully mixed anaerobic reaction tank with sludge reflux, mg MLVSS/L;
Y--sludge yield coefficient, reference value of low-fat wastewater is 0.0044 kg MLVSS/kg BOD5, high-fat wastewater
The test value is 0.040 kg MLVSS/kg BOD5;
B--endogenous respiration coefficient, the reference value of low-fat sewage is 0.019 d-1, and the reference value of high-fat sewage is 0.015 d-1;
Q--Design flow rate of fully mixed anaerobic reaction tank with sludge reflux, m3/d;
C0--CODCr concentration of complete mixed anaerobic reaction tank with sludge reflux, mg/L;
Ce--CODCr concentration of complete mixed anaerobic reaction tank with sludge reflux, mg/L;
Θc--sludge age (SRT), d. Θc is about 临 in a fully mixed anaerobic reaction tank wastewater treatment process with sludge reflux
The sludge age is 2 to 10 times the mCθ.
6.4.2.2.2 The critical sludge age (mCθ) shall be calculated as follows.
YkC
CKmm
=θ (6)
In the formula.
Cθ - critical sludge age, d;
Km--Mie's constant (half-saturation constant), the value of which is 2
1 substrate concentration at the maximum reaction rate, mg/L;
K--the maximum rate at which the product is produced, d-1;
C0--CODCr concentration of complete mixed anaerobic reaction tank with sludge reflux, mg/L;
Y--sludge yield coefficient, 0.0044 kg MLVSS/kg BOD5~0.04 kg MLVSS/kg BOD5.
6.4.2.2.3 When designing the volume of a fully mixed anaerobic reaction tank with sludge return according to the volumetric load, this standard shall be implemented.
The provisions of 6.4.2.1.2.
6.4.3 Stirring
6.4.3.1 Stirring design of a fully mixed anaerobic reactor without sludge backflow
6.4.3.1.1 It is advisable to use the biogas circulation mixing method to use the explosion-proof air compressor to introduce the biogas pressure into the fully mixed anaerobic reaction tank.
The push-flow submersible mixer and the like perform biogas circulation agitation. Push-flow submersible mixers shall comply with HJ/T 279.
6.4.3.1.2 Biogas agitation should achieve the following effects.
a) uniformly mixing organic pollutants with anaerobic microorganisms;
b) keeping the sludge concentration, pH value, microbial population, etc. throughout the fully mixed anaerobic reaction tank uniform;
c) timely transfer heat to all parts of the pool to make the heating even;
d) When there is an organic impact load or toxic substances entering, evenly mixing and mixing can minimize the impact or toxicity;
e) greatly reduce the sediment deposition at the bottom of the pool and the formation of liquid scum.
6.4.3.1.3 After the biogas is pressurized by the compressor, the anaerobic reaction is input from the uniform riser through the gas distribution loop at the top of the anaerobic reaction tank.
In the pool, the amount of biogas is designed from 5 m3/(1000 m3·min) to 7 m3/(1000 m3·min), and the flow rate of the main pipe and the gas distribution pipe is 10 m/s~
15 m/s, riser flow rate 5 m/s ~ 7 m/s.
6.4.3.1.4 The power of the biogas compressor can be calculated as follows.
VWN = (7)
In the formula.
N--gas compressor power, W;
V--full mixed anaerobic reaction tank volume, m3;
W--The power required for the unit pool capacity is generally 5 W/m3 to 8 W/m3.
6.4.3.2 Stirring design of a fully mixed anaerobic reactor with sludge reflux
6.4.3.2.1 Mechanical agitation should be adopted. The mixing power should be 5 W/m3 to 8 W/m3, and the installation angle should be adjustable.
Blender.
6.4.3.2.2 The stirrer shall be selected according to the tank type of the fully mixed anaerobic reaction tank. The stirrer shall comply with the provisions of HJ/T 279.
6.4.3.2.3 The spacing and position of the mechanical stirrer arrangement shall be determined according to the test or provided by the supplier.
6.4.3.2.4 A stirrer shall be provided in each fully mixed anaerobic reaction tank, and the stirrer shall be arranged symmetrically.
6.4.4 Overflow
A fully mixed anaerobic reactor should be equipped with a supernatant overflow. The overflow device shall be provided with a water seal to prevent the gas collecting hood and the atmosphere
through. Commonly used overflow devices are inverted siphon, atmospheric and water-sealed.
6.4.5 Draining mud
6.4.5.1 The sludge yield of the fully mixed anaerobic reactor is 0.0044 kg MLVSS/kg BOD~0.04 kg MLVSS/kg
BOD, the sludge discharge frequency should be determined according to the sludge concentration distribution curve. Sampling ports should be set at different heights, according to the monitoring of sludge
The sludge distribution curve is determined by the concentration.
6.4.5.2 The drain pipe of the fully mixed anaerobic reaction tank without sludge return shall be located at the bottom of the tank and drained by the clean water pressure.
6.4.5.3 A fully mixed anaerobic reaction tank with sludge reflux is followed by a sedimentation tank, and sludge is discharged in the sedimentation tank.
The machine is completed.
6.5 degasser
A fully mixed anaerobic reactor should use a degasser with a vacuum of about 4900 Pa.
6.6 Sedimentation tank
The surface area of the sedimentation tank in the subsequent treatment process of the fully mixed anaerobic reaction tank is calculated as follows.
Nq
QA = ..(8)
In the formula.
A--the surface area of the sedimentation tank, m2;
Q--Design flow rate of fully mixed anaerobic reaction tank with sludge reflux, m3/d;
N--the number of sedimentation tanks;
q--The hydraulic load of the sedimentation tank area, generally ranging from 0.5 m3/(m2·d) to 1.0 m3/(m2·d).
6.7 Sludge backflow
6.7.1 The sludge returning facilities should use centrifugal pumps, mixed flow pumps, submersible pumps and other equipment that are not easy to generate reoxygenation.
6.7.2 The reflux facility should be calculated and determined according to the maximum sludge reflux ratio in the treatment system.
6.7.3 The reflow device should be set up for backup.
6.8 Excess sludge
6.8.1 The amount of excess sludge is calculated according to the sludge sludge age.
VXX θ=Δ (9)
In the formula.
△X--the amount of excess sludge, g MLVSS/d;
V--the volume of the fully mixed anaerobic reaction tank, m3;
X--the concentration of sludge in the fully mixed anaerobic reaction tank, mg MLVSS/L;
Θc--sludge mud age, d.
6.8.2 The amount of excess sludge is calculated according to the sludge yield coefficient, attenuation coefficient and non-biodegradable inert suspension.
)()( 00 ede SSSSfQVXKSSYQX − −−=Δ (10)
In the formula.
△X--the amount of excess sludge, g MLVSS/d;
V--the volume of the fully mixed anaerobic reaction tank, m3;
Y--sludge yield coefficient, 0.0044 kg MLVSS/kg BOD5~0.04 kg MLVSS/kg BOD5;
Q--completely mixed anaerobic reaction tank design flow, m3/d;
So--completely mixed anaerobic reaction tank water BOD5, mg/L;
Se--completely mixed anaerobic reaction tank effluent BOD5, mg/L;
Kd--attenuation coefficient, d-1;
X--the concentration of sludge in the fully mixed anaerobic reaction tank, mg MLVSS/L;
The sludge conversion rate of f--MLSS should be determined according to the test data, and it can be taken from 0.5 to 0.7 without test data.
g MLVSS/g MLSS;
SSo--in-mixed anaerobic reaction tank inlet suspension concentration, kg/m3;
SSe--concentration of suspended solids in fully mixed anaerobic reactor, kg/m3.
6.8.3 The remaining sludge should be equipped with a metering device, which can be measured by wet sludge metering or dry sludge metering.
6.8.4 The design and operation of sludge discharge operation in sedimentation tanks shall comply with the provisions of GB 50014.
6.8.5 Sludge treatment and disposal requirements GB 5001.
Related standard:   HJ 1009-2019  HJ 1015.1-2019
   
 
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