Search result: HJ 2006-2010
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| HJ 2006-2010 | English | 529 |
Add to Cart
|
4 days [Need to translate]
|
Technical specifications for coagulation and flocculation process in wastewater treatment
| Valid |
HJ 2006-2010
|
| Standard ID | HJ 2006-2010 (HJ2006-2010) | | Description (Translated English) | Technical specifications for coagulation and flocculation process in wastewater treatment | | Sector / Industry | Environmental Protection Industry Standard | | Classification of Chinese Standard | Z23 | | Classification of International Standard | 13.060.30 | | Word Count Estimation | 20,271 | | Date of Issue | 2010-12-17 | | Date of Implementation | 2011-03-01 | | Quoted Standard | GB 4482; GB/T 22627-2008; GB/T 17514; GB 50141; GB 50334; GB 50204; GB 50205; HJ/T 335; CJJ 60; CJ/T 51; HG 2227 | | Summary | This standard specifies the sewage treatment works in the coagulation and flocculation process used in the general requirements, process design, equipment selection, detection and control, operation and management of the technical requirements. This standard applies to municipal wastewater or industrial wastewater treatment by coagulation and flocculation process engineering design, construction, commissioning, operation and management, as feasibility studies, environmental impact assessment, process design, construction inspection, operation and management of the technical basis. |
HJ 2006-2010
Technical specifications for coagulation and flocculation process in wastewater treatment
National Environmental Protection Standard of the People's Republic
Technical specification for sewage coagulation and flocculation treatment
Technical specifications for coagulation and flocculation process in
Wastewater treatment
Released.2010-12-17
2011-03-01 Implementation
Ministry of Environmental Protection released
Ministry of Environmental Protection
announcement
No. 94 of.2010
In order to implement the "Environmental Protection Law of the People's Republic of China" and standardize the construction and operation of pollution control projects, the "Air Pollution Control Workers" are now approved.
The 9 standards such as the “Technical Guidelines” are national environmental protection standards and are released.
The standard name and number are as follows.
I. Technical Guidelines for Air Pollution Control Engineering (HJ .2000-2010)
2. Technical Specifications for Flue Gas Desulfurization Engineering in Thermal Power Plants (HJ .2001-2010)
Third, electroplating wastewater treatment engineering technical specifications (HJ .2002-2010)
4. Technical specifications for the treatment of tannery and fur processing wastewater (HJ .2003-2010)
V. Technical Specifications for Slaughter and Meat Processing Wastewater Treatment Engineering (HJ .2004-2010)
Technical Specifications for Constructed Wetland Sewage Treatment Engineering (HJ .2005-2010)
Eight, technical specifications for sewage air flotation treatment (HJ .2007-2010)
9. Technical Specifications for Sewage Filtration Treatment Engineering (HJ .2008-2010)
The above standards have been implemented since March 1,.2011 and published by the China Environmental Science Press. The standard content can be found on the website of the Ministry of Environmental Protection.
Special announcement.
December 17,.2010
Content
Foreword..iv
1 Scope..1
2 Normative references..1
3 Terms and Definitions.1
4 pollutants and pollution load. 2
5 General requirements..2
6 Process Design..3
7 Main process equipment and materials.13
8 Detection and process control 13
9 Major auxiliary works.13
10 Labor Safety and Occupational Health..14
11 Construction and acceptance 14
12 Operation and maintenance 14
Iv
Foreword
To implement the "Environmental Protection Law of the People's Republic of China" and the "Water Pollution Control Law of the People's Republic of China", regulate sewage coagulation and flocculation
Handle the construction of the project to make it run continuously and stably, discharge to the standard, prevent water pollution, improve environmental quality, and formulate this standard.
This standard specifies the general requirements for the coagulation and flocculation process used in wastewater treatment projects, process design, equipment selection, testing and
Technical requirements for control and operation management.
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. Jiangsu Academy of Environmental Sciences, Southeast University, Jiangsu Pengyi Environmental Engineering Design Institute, Yangzhou Chenglu Ring
Engineering Co., Ltd.
This standard was approved by the Ministry of Environmental Protection on December 17,.2010.
This standard has been implemented since March 1,.2011.
This standard is interpreted by the Ministry of Environmental Protection.
Technical specification for sewage coagulation and flocculation treatment
1 Scope of application
This standard specifies the general requirements for the coagulation and flocculation process used in wastewater treatment projects, process design, equipment selection, testing and
Technical requirements for control and operation management.
This standard is applicable to the design, construction, acceptance and operation management of coagulation and flocculation processes in urban sewage or industrial wastewater treatment projects.
It can be used as a technical basis for feasibility study, environmental impact assessment, process design, construction acceptance, and operation management.
2 Normative references
The terms in the following documents become the terms of this standard by reference to this standard. The latest version of the undated reference document
Applicable to this standard.
GB 4482 water treatment agent ferric chloride
GB/T 22627-2008 Water treatment agent polyaluminium chloride
GB/T 17514 water treatment agent polyacrylamide
GB 50141 Water supply and drainage structure engineering construction and acceptance specification
GB 50334 Urban Wastewater Treatment Plant Engineering Quality Acceptance Specification
GB 50204 Concrete Structure Engineering Construction Quality Acceptance Specification
GB 50205 Steel Structure Engineering Construction Quality Acceptance Specification
Technical Specifications for Operation and Assessment of HJ/T 355 Water Pollution Source Online Monitoring System (Trial)
CJJ 60 Urban Wastewater Treatment Plant Operation, Maintenance and Safety Technical Regulations
CJ/T 51 Standard for urban sewage quality inspection methods
HG 2227 water treatment agent aluminum sulfate
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Coagulation
Refers to the process of adding coagulant and completing the hydrolysis and polycondensation reaction under certain hydraulic conditions to destabilize and agglomerate the colloidal dispersion system.
3.2
Mixed mixing
It refers to the rapid and uniform diffusion of the injected agent into the treated water to create a good hydrolysis reaction condition.
3.3
Flocculation
Refers to the colloidal colloids colliding with each other under certain hydraulic conditions, accumulating or adding a small amount of flocculant to assist coagulation to form larger flocculent particles.
the process of.
3.4
Coagulant
Refers to the generic name of the drug added to make the colloid lose stability and the destabilizing colloids accumulate.
3.5
Coagulant aids
Refers to the supplementary agent added in order to improve the flocculation effect during the precipitation and clarification of water.
3.6
Perforated swirling reaction cell perforating rotational flow reactor
Refers to the pool in which the water flow forms a swirling flow state between the reaction chambers through the provided channels to complete the flocculation process.
3.7
Mechanical reaction tank
Refers to a flocculation reaction tank with mechanical agitation.
3.8
Folding plate reactor
Refers to a reaction tank that uses a flap spoiler unit in the pool to achieve the turbulent state required for flocculation.
3.9
Grid (grid) reaction cell grid reactor
Refers to a reaction cell in which a grid or grid is placed in a section of water passing along a certain distance along the process to promote a fluid flow state change to complete the flocculation process.
3.10
Pharmacy fixed reserve
Refers to the reserve that is not allowed to be used in the warehouse of the drug for consideration of abnormal reasons, referred to as the fixed reserve of the drug.
the amount.
3.11
Pharmacy turnover reserve current reserve
Refers to the amount of reserves required to consider the difference between the consumption of medicines and the amount of supply, referred to as the amount of pharmaceutical turnover.
3.12
Coagulating sedimentation
Refers to a combination method in which a coagulation reaction is completed by using a chemical agent to agglomerate contaminants in water into flocs and removed by a precipitation method.
4 Contaminants and pollution loads
4.1 The coagulation process can be applied to urban sewage treatment and industrial wastewater treatment of various water quantities.
4.2 Coagulation process There is no limit to the concentration of raw water suspended particles, colloidal particles and related organic, chroma and oil substances.
Efficiency is different.
4.3 Coagulation process has good removal effect on suspended particles, colloidal particles and hydrophobic pollutants; hydrophilic and soluble pollutants
There is also a certain flocculation effect. In addition.
1) The coagulation process can be used for the adsorption coagulation treatment of insoluble macromolecular organic matter.
2) The coagulation process can be used for the destabilization and coagulation treatment of chroma substances, humic acids, fulvic acids, surfactants and the like.
3) The coagulation process can be used for emulsion demulsification and coagulation treatment.
5 General requirements
5.1 Coagulation and flocculation treatment The construction scale is determined by the amount of treated water, and the designed water volume is determined by the maximum amount of water in the project.
5.2 The coagulation and flocculation treatment process should be equipped with pretreatment equipment such as regulation and oil separation. The subsequent process should be set up with sedimentation tank or air flotation tank. When mining
When using contact filtration, coagulation should be connected directly to the filter.
5.3 The pH value of the completion of the coagulation reaction is quite different depending on the dosage of the drug to be administered, and the optimum pH value should be 7 to 8.5.
5.4 Coagulation and flocculation treatment When the structure is combined with sedimentation or air flotation, the water flow should be designed to flow into the subsequent equipment during the elevation arrangement.
5.5 Dosing equipment and pharmaceutical mixing equipment should be as close as possible to the coagulation process facilities.
5.6 All coagulation equipment, connecting pipes, and dosing and mixing machinery should have necessary anti-corrosion measures.
5.7 Mud separation of coagulation process is completed by subsequent precipitation or air flotation equipment, and sludge treatment should be considered in accordance with relevant national management requirements.
Dispose of.
5.8 Pretreatment should be carried out when the raw water contains volatile harmful gases.
6 Process design
6.1 General requirements
6.1.1 When the amount of treated sewage is not large (such as Q< 100 m3/h), the coagulation process should be combined with the sedimentation tank or the flotation tank.
6.1.2 The type and quantity of pesticides should be based on the raw water quality (pH, alkalinity, SS, etc.), the nature of the pollutants (such as relative molecular mass,
Molecular structure, density, concentration, hydrophobicity, etc.) were determined experimentally.
6.1.3 The coagulation process should be reasonably controlled to pH. When conditions permit, the pH automatic control instrument should be set up and coupled with the dosing metering pump.
6.1.4 The selection of the chemical mixing equipment should be determined according to the comprehensive analysis of the sewage volume, sewage properties, pH value, water temperature and other conditions, commonly used mixing
The equipment has a tubular mixer, a mechanical mixer, a water pump mixing device, and the like.
6.1.5 The choice of reaction tank type should be based on the sewage quality, design production capacity, water quality requirements after treatment, and consider the change of sewage water temperature,
Factors such as the uniformity of the influent water quality and the continuous operation, etc., are determined by technical and economic comparisons in combination with local conditions.
6.1.6 When the sewage SS is high or the dosage is large, a sludge discharge device should be installed in the reaction equipment.
6.2 Selection of coagulant and coagulant
6.2.1 Coagulant
6.2.1.1 Commonly used coagulants should be used in accordance with Table 1.
Table 1 Commonly used coagulants and conditions of use
Coagulant hydrolysate applicable conditions
Aluminum sulfate
Al2(SO4)3·18 H2O
Al3, [Al(OH)2]
[Al2(OH)n](6−n)
It is suitable for raw water with high pH and high alkalinity.
When demulsification and removal of organic matter in water, the pH should be between 4 and 7.
The pH of the suspended solids in the water should be controlled at 6.5-8.
Applicable water temperature 20～40°C Alum KAl(SO4)2·12H2O
Al3, [Al(OH)2]
[Al2(OH)n](6−n)
Ferric chloride FeCl3·6H2O
Fe(H2O)63
[Fe 2(OH)n](6−n)
Corrosive to metals, concrete and plastics.
Ferrous ions must first be oxidized to ferric iron, and when the pH is low, they must be aerated.
Oxygen or dosing aids are chlorine oxidized.
The pH range should be between 7 and 8.5.
The flocs form faster, are more stable, and have a shorter settling time.
Ferrous sulfate FeSO4·7H2O
Fe(H2O)63
[Fe2(OH)n](6−n)
polymerization
Salt
Polyaluminum chloride
[Al2(OH)nCl6−n]m
PAC
[Al2(OH)n](6−n)
It is less affected by pH and temperature, and the adsorption effect is stable.
The pH is 6-9, and the adaptability range is wide. Generally, it is not necessary to add an alkali agent.
Good coagulation effect, low consumption of effluent, low turbidity, low chroma, high raw water
Especially when turbidity is present.
Simple equipment, easy operation and good working conditions
Polyferric sulfate
[Fe2(OH)n(SO4)6−n]m
PFS
[Fe2(OH)n](6−n)
6.2.1.2 The choice of coagulant variety and its dosage should be based on the results of sewage coagulation sedimentation test or the operation under similar water quality conditions.
The test is determined by comprehensive comparison.
6.2.1.3 Selection of aluminum salt coagulant
1) The quality of aluminum sulfate should meet the requirements of HG 2227. The active ingredient of Al2O3 is the main indicator and should be verified before use.
2) Aluminum sulfate is suitable for water quality conditions in which the raw water has a high pH or a large alkalinity.
3) For the polymerization of aluminum chloride, a product with a higher degree of alkalinity B should be used.
4) The quality of polyaluminum chloride should meet the requirements of GB 15892, the most important of which is the degree of alkalinity B, which should be between 50% and 80%.
The degree of alkalinity B is calculated according to formula (1).
(OH) 100%
3[ (Al)]
mB
= × (1)
Where. B--degree of alkalization of polyaluminum chloride;
m(OH)-the amount of [OH] substance of polyaluminum chloride;
m(Al) - the amount of [Al] material of the polyaluminum chloride.
5) Polyaluminum chloride consumes less alkalinity during coagulation and has a wide pH range.
6.2.1.4 Selection of iron salt coagulant
1) Iron salt coagulant should be preferred when heavy metal ions are contained in the sewage.
2) The iron salt coagulant should not be used in excess, and the reaction conditions such as pH should be controlled.
3) Ferric chloride is highly corrosive and the anti-corrosion method is described in 6.3.2.3.
4) The quality of ferric chloride should meet the requirements of GB 4482. The iron content should be verified before use (in terms of Fe2O3), and no other contamination should be brought.
Dyed matter.
5) Ferrous sulfate as a coagulant should ensure that the raw water has sufficient alkalinity and dissolved oxygen. If necessary, aeration or oxygenation or oxidant should be applied.
The pH is often controlled to be greater than 8 to 8.5.
Chlorine gas can be used as an oxidizing agent for ferrous sulfate coagulation. The amount of chlorine added can be calculated according to formula (2). usually 1/8 of FeSO4·7H2O.
c α β= (2)
Where. c--Cl2 dosage, mg/L;
---ferrous ferrous sulfate dosage, mg/L, calculated as FeSO4·7H2O;
β--Cl2 over-feed, 1.5 ~ 2 mg/L.
6) When using iron salt coagulant, the heavy metal ions and other pollutants in the drug should be controlled. Do not use if it exceeds the index.
6.2.2 Selection of flocculants and coagulants
6.2.2.1 Commonly used flocculants are polyacrylamide (PAM), activated silicic acid, bone glue, etc., the most commonly used is PAM. Activated silicic acid
It is effective when it is low temperature and low turbidity water, and it is added after the completion of the coagulation reaction. It has a proper acidification degree and activation time, and the preparation is complicated. Bone gum
Mixture of ferric chloride.
6.2.2.2 Conditions for use of PAM
1) PAM is applied to flocculation after completion of coagulation reaction of aluminum salt and iron salt; its dosage should generally be less than 0.3-0.5 mg/L, and the dosing point is reversed.
Should be the end of the pool.
2) PAM should be equipped with a special dissolution (hydrolysis) device, the dissolution time should be controlled at 45 ~ 60 min, and the concentration of the drug should be less than 2%.
The hydrolysis time is 12 to 24 h, and the degree of hydrolysis is 30% to 40%.
3) After the PAM dissolution configuration is completed, it cannot be used for more than 48 hours.
4) PAM should be considered for anti-freezing measures when stored and stored at room temperature.
6.2.2.3 Coagulant can choose chlorine (Cl2), lime (CaO), sodium hydroxide (NaOH), etc.
1) Conditions for the use of chlorine.
z When it is necessary to treat high chroma water, destroy the structure of residual organic matter in water and remove odor, chlorine can be injected before the coagulant is added to reduce
Coagulant dosage;
z When ferrous sulfate is used as a coagulant, chlorine can be added to promote the oxidation of divalent iron to ferric iron.
2) Conditions for use of lime.
z When it is necessary to replenish the alkalinity of the sewage;
z need to remove CO2 from water and adjust pH value;
z need to increase the floc density and accelerate the flocculation;
z When it is necessary to enhance the dewatering performance of sludge.
3) Conditions for the use of sodium hydroxide.
z When the pH of the water needs to be adjusted.
6.3 Coagulating agent dosing system
6.3.1 General requirements
1) The choice of coagulant and coagulant and its dosage should be determined according to the characteristics of the sewage.
2) The equipment and pipeline of the coagulant dosing system should adopt corresponding anti-corrosion measures according to the nature of the coagulant.
3) The method of dosing the coagulant should adopt the liquid dosing method.
4) The dosage method of coagulant should be selected by metering pump, and it can also be used before pumping and ejector.
5) The coagulant dosing system usually includes. storage, preparation, lifting, storage, metering and dosing of the medicament.
6.3.2 Modulation of the medicament
6.3.2.1 Preparation method of medicament
1) The method of dissolving and diluting the coagulant should be determined according to the amount of dosage and the nature of the coagulant. It should be mechanically stirred or taken.
Use water or compressed air.
2) The hydraulic pressure of the water supply should be greater than 0.2 MPa.
3) Compressed air modulation can be used for the modulation of chemicals in sewage treatment plants (station) with a large amount of water. Control the aeration intensity at 3 ~ 5 L/(m2 · s);
The preparation of lime emulsion is not suitable for compressed air.
6.3.2.2 The volume of the dissolution tank and the solution tank are calculated according to formula (3) and formula (4).
1 2W(0.2 0.3)W = ～ (3)
1 000 1 000 417
aQ aQW
Cn cn
×= =× (4)
Where. W1--dissolving tank volume, m3;
W2--solution tank volume, m3;
The maximum dosage of α--coagulant, based on anhydrous product, mg/L, the maximum amount of lime is calculated as CaO;
Q--the amount of water treated, m3/h;
C--solution concentration, %, generally 5 to 20 (calculated as solid weight of coagulant), or 5 to 7.5 (deducted crystal water)
The lime milk is 2 to 5 (calculated as pure CaO);
n--The number of daily modulations should be determined according to factors such as the dosage of coagulant and the preparation conditions, and should not be more than 3 times.
6.3.2.3 Modulation equipment
1) The bottom of the dissolution tank and the solution tank should be not less than 0.02. The bottom of the tank should have a slag discharge pipe. The wall of the tank should be set to be super high to prevent the solution from overflowing.
2) The inner side of the dissolution tank and the solution tank shall be treated with anti-corrosion treatment. Generally, the inner wall is coated with epoxy glass reinforced plastic, diabase, acid-resistant clay tiling or
For polyvinyl chloride sheets, etc., when the chemicals used are not too corrosive, acid-resistant cement mortars may also be used.
3) When the dosage is small, a leaching tank may be arranged in the upper part of the solution tank instead of the solvent pool.
4) The solution tank can be placed overhead so that gravity can be added. There should be a workbench around the pool, which should be set at the highest working water level in the pool.
Overflow device.
5) The solution pool with a smaller dosage can be combined with the solvent pool. The solution pool should be used in the equipment pool.
6) The solution solution tank should usually be equipped with a stirring device, and the stirring speed is generally 10-15 r/min.
7) Stirring impeller should be equipped with speed adjustment device as needed.
6.3.3 Dosing of liquid medicine
6.3.3.1 The liquid medicine lifting equipment shall be provided for the liquid medicine lifting, and the centrifugal pump and the water ejector are commonly used.
6.3.3.2 The metering pump should be used for the feeding equipment, and an automatic control device should be provided to automatically adjust the dosage.
6.3.4 Dosing room and drug store
6.3.4.1 General provisions
1) The dosing room should be combined with the drug storehouse. The outdoor storage tank, dosing room and drug storey should be placed as close as possible to the drug dispensing point and set in ventilation.
Good location.
2) The chemical storage equipment should be set up according to the specific conditions in the pharmaceutical warehouse and dosing room.
6.3.4.2 Dosing room arrangement
1) There should be flushing facilities in the dosing room, and the floor should have drainage ditch.
2) The plastic liquid conveying pipe can generally be made of plastic pipes such as hard polyvinyl chloride.
3) A workbench should be provided at the side of the solution tank, and the width should be 1.5 m.
6.3.4.3 Drug store layout
1) The fixed reserve of the drug can be used in the amount of 7 to 15 days of the maximum dose.
2) The coagulant stacking height is generally 1.5 to 2.0 m, and when lime is used, it can be 1.5 m. When using mechanical handling equipment, it can be appropriate.
increase.
3) When necessary, the drug storehouse can be equipped with lifting equipment such as electric hoists or electric suspension cranes.
4) There should be good ventilation and the agent should be protected from moisture.
6.4 Selection and design of hybrid equipment
6.4.1 Selection of hybrid equipment
1) Mixing mode can be mixed by tube mixer, water pump mixing and mechanical mixing.
2) The selection of mixing equipment should be determined according to the sewage quality and operating experience under similar conditions or through experiments.
3) The tube mixer is suitable for the case where the raw water volume is stable, the fiber-free material is not used, and the water pump has a surplus head.
4) The pump mixing is suitable for the case where the original cement sand content is small, the suspended solid concentration is low, and the water pump is close to the reaction equipment.
5) Mechanical mixing is suitable for the case where the raw water composition is complex and the water quality and quantity are variable. The mixing tank can be combined with the flocculation reaction tank.
6.4.2 General requirements
1) Mixing equipment should be mixed quickly.
2) The coagulant which increases the flocculation effect such as polymer flocculant shall not be added in the mixing equipment.
3) The mixing time is generally 10 to 30 s. The stirring speed gradient G is generally 600 to 1 000 s−1.
4) The direct connection between the mixing facility and the subsequent processing structures is as much as possible.
5) The flow rate of the connecting pipeline between the mixing facility and the subsequent processing structure should be 0.8-1.0 m/s.
6.4.3 Water pump mixing
1) A dosing pipe should be installed on the suction pipe of each pump, and a water seal box equipped with a float valve should be installed.
2) Corrosive agents should not be mixed by water pump.
3) The distance between the pump and the treated structure should generally be less than 60 m.
6.4.4 Tubular mixer
1) The number of sections is generally 2 to 3 segments, and the flow rate in the tube is 1.0 to 1.5 m/s.
...
......
|