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HJ 1095-2020 English PDF

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HJ 1095-2020: Technical specifications of fenton oxidation process for wastewater treatment
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Basic data

Standard ID HJ 1095-2020 (HJ1095-2020)
Description (Translated English) Technical specifications of fenton oxidation process for wastewater treatment
Sector / Industry Environmental Protection Industry Standard
Word Count Estimation 23,232
Date of Issue 2020
Date of Implementation 2020-01-13
Issuing agency(ies) Ministry of Ecology and Environment

HJ 1095-2020: Technical specifications of fenton oxidation process for wastewater treatment

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Technical specifications of fenton oxidation process for wastewater treatment National Environmental Protection Standards of the People's Republic of China Fenton oxidation process wastewater treatment engineering technical specifications 2020-01-14 release 2020-01-14 Implementation Issued by the Ministry of Ecology and Environment

Table of contents

Foreword...I 1 Scope of application...1 2 Normative references...1 3 Terms and definitions...3 4 Pollutants and pollution load...4 5 General requirements...5 6 Process design...6 7 Main process equipment and materials...11 8 Inspection and process control...13 9 Main auxiliary projects...13 10 Work Safety and Occupational Health...14 11 Construction and acceptance...15 12 Operation and maintenance...17

Foreword

In order to implement the "Environmental Protection Law of the People's Republic of China" and "Water Pollution Prevention Law of the People's Republic of China" and other laws and regulations, Prevent and control water pollution, improve the quality of ecological environment, standardize the construction and operation management of Fenton oxidation wastewater treatment project, and make Set this standard. This standard specifies the overall requirements, process design, main process equipment and materials, Fenton oxidation wastewater treatment project Technical requirements for inspection and process control, construction and acceptance, operation and maintenance. This standard is a guiding standard. This standard is issued for the first time. This standard was formulated 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, Tsinghua University, Xinlu Environmental Protection Industry, Xinhui District, Jiangmen City Development Corporation, Anle Engineering Co., Ltd. This standard was approved by the Ministry of Ecology and Environment on January 13, 2020. This standard will be implemented on January 14, 2020. This standard is interpreted by the Ministry of Ecology and Environment. Fenton oxidation process wastewater treatment engineering technical specifications

1 Scope of application

This standard specifies the overall requirements, process design, main process equipment and materials, Fenton oxidation wastewater treatment project Technical requirements for inspection and process control, construction and acceptance, operation and maintenance. This standard is applicable to the design, construction, acceptance, and acceptance of wastewater treatment projects containing refractory organics by Fenton oxidation Operation and maintenance.

2 Normative references

The content of this standard refers to the following documents or their clauses. For undated reference documents, the latest version applies In this standard. GB/T 534 Industrial sulfuric acid GB/T 1616 Industrial hydrogen peroxide GB 3096 Acoustic Environmental Quality Standard GB/T 3797 electrical control equipment GB/T 4942.2 Low-voltage electrical enclosure protection class GB 5085.7 General Rules for Identification Standards of Hazardous Wastes GB 5226.1 Electrical Safety of Machinery Electrical Equipment of Machinery Part 1.General Technical Conditions GB 6944 Dangerous goods classification and article number GB/T 10531 Water treatment agent ferrous sulfate GB 12268 List of Dangerous Goods GB 12348 Environmental Noise Emission Standard at the Boundary of Industrial Enterprises GB/T 12801 General Principles of Safety and Health Requirements for Production Process GB 15603 General rules for the storage of commonly used dangerous chemicals GB/T 17514 Water treatment agent anionic and non-ionic polyacrylamide GB 18597 Pollution Control Standard for Hazardous Waste Storage GB 18598 Pollution Control Standard for Hazardous Waste Landfill GB 18599 Pollution control standard for general industrial solid waste storage and disposal sites GB/T 22627 water treatment agent polyaluminum chloride GB 50014 Outdoor Drainage Design Code GB 50016 Code for fire protection of building design GB/T 50046 Design standard for corrosion protection of industrial buildings GB 50053 20kV and below substation design code GB/T 50087 Industrial Enterprise Noise Control Design Code GB 50108 Technical code for waterproofing of underground engineering GB 50141 Code for construction and acceptance of water supply and drainage structures GB 50160 Code for fire protection design of petrochemical enterprises GB 50187 General Layout Design Specification for Industrial Enterprises GB 50204 Code for Acceptance of Construction Quality of Concrete Structure Engineering GB 50205 Code for Construction Quality Acceptance of Steel Structure Engineering GB 50212 Construction Code for Anti-corrosion Engineering of Buildings GB 50231 General specification for construction and acceptance of mechanical equipment installation engineering GB 50235 Construction Code for Industrial Metal Pipeline Engineering GB 50268 Code for construction and acceptance of water supply and drainage pipeline engineering GB 50275 Specification for construction and acceptance of fan, compressor and pump installation engineering GB 50726 Industrial equipment and pipeline anti-corrosion engineering construction code GB 50727 Code for acceptance of construction quality of industrial equipment and pipeline anti-corrosion engineering GBZ 1 Hygienic Standard for Design of Industrial Enterprises GBZ 2.1 Occupational Exposure Limits for Hazardous Factors in the Workplace Part 1.Chemical Hazardous Factors GBZ 2.2 Occupational Exposure Limits for Hazardous Factors in the Workplace Part 2.Physical Factors AQ 3018 General Rules for Operation Safety of Hazardous Chemicals Storage Tank Farm AQ 3047 Specification for Safety Warning Signs in Chemical Workplaces CJJ 60 Technical Regulations for Operation, Maintenance and Safety of Urban Sewage Treatment Plant CJJ/T 120 Technical Standard for Electrical and Automation Engineering of Urban Drainage System HG/T 20507 Automation Instrument Selection Design Specification HG 20520 glass fiber reinforced plastic/polyvinyl chloride (FRP/PVC) composite pipe design regulations HJ/T 91 Technical specification for surface water and sewage monitoring HJ/T 298 Technical Specification for Identification of Hazardous Wastes HJ.2006 Technical Specification for Sewage Coagulation and Flocculation Treatment Engineering HJ.2007 Technical Specification for Wastewater Air Flotation Treatment Engineering HJ 2021 Technical specification for sewage treatment engineering of internal circulation aerobic biological fluidized bed HJ 2025 Technical specification for hazardous waste collection, storage and transportation SH/T 3024 Petrochemical Environmental Protection Design Specification "National Directory of Hazardous Wastes" (Order No. 39 of the Ministry of Environmental Protection) "Regulations on the Safety Management of Hazardous Chemicals" (State Council Order No. 344) "Interim Measures for Environmental Protection Acceptance of Construction Projects Completed" (Guo Environmental Guidance and Environmental Assessment [2017] No. 4) "Construction Project (Engineering) Completion Inspection and Acceptance Measures" (Ji Jian Jian [1990] No. 1215) "Technical Requirements for Environmental Protection Completion Acceptance Monitoring of Construction Projects" (Huanfa [2000] No. 38)

3 Terms and definitions

The following terms and definitions apply to this standard. 3.1 Fenton reagent fenton reagent Refers to a homogeneous liquid system composed of ferrous ions (as a catalyst) and hydrogen peroxide (as an oxidant). 3.2 Fenton oxidation Refers to the process in which Fenton's reagent generates hydroxyl radicals under acidic conditions, destroys the structure of organic matter, and finally oxidizes and decomposes organic matter. 3.3 acid dosing process Refers to the process of adding concentrated sulfuric acid or dilute sulfuric acid to adjust the pH value of wastewater to acidity, so that the pH value of wastewater is suitable for Fenton oxidation reaction. 3.4 catalyst mixing process Refers to the process of adding catalyst and fully mixing the catalyst (ferrous salt, usually ferrous sulfate) with wastewater. 3.5 oxidation process Refers to the addition of oxidant (hydrogen peroxide) to fully mix the oxidant and wastewater, and generate Fenton oxygen under the action of the catalyst The process of oxidizing and decomposing organic matter in wastewater. 3.6 Neutralizing process Refers to the process of adjusting the pH value of the effluent from the oxidation reaction tank to meet the subsequent processing requirements or discharge requirements. Adjust the pH value to 7-9.

4 Pollutants and pollution load

4.1 General rules 4.1.1 Fenton oxidation method can be used as a pretreatment process before biochemical treatment of wastewater, and it can also be used as advanced treatment after biochemical treatment of wastewater Craft. 4.1.2 Fenton oxidation method is mainly suitable for the treatment of wastewater containing refractory organic matter, such as paper industry wastewater, dyeing and finishing industry wastewater, Coal chemical wastewater, petrochemical wastewater, fine chemical wastewater, fermentation industrial wastewater, landfill leachate and other wastewater and industrial parks Centralize the treatment of wastewater from wastewater treatment plants. 4.1.3 The removal rate of pollutants by Fenton oxidation method should be determined through experiments or by referring to similar cases in the same industry. 4.2 Design water volume 4.2.1 The design water volume shall be designed according to the highest daily waste water volume. When setting the conditioning tank before the Fenton oxidation process, The maximum water volume design for the Fenton oxidation process after the average volume of the saving pond. 4.2.2 For existing production enterprises or industrial parks, the actual measurement value of the total discharge of the The predicted value of the certificate (according to the actual development of the enterprise or park and the overall planning forecast) determine the design water volume. Among them, the measurement method should Comply with HJ/T 91 regulations. 4.2.3 When the actual water consumption data cannot be obtained, it can be determined by referring to the relevant national regulations on water consumption in the industry, or according to The drainage data of existing enterprises with the same scale and production process in the same industry is determined by analogy. 4.3 Design water quality and inlet water quality requirements 4.3.1 The design water quality should be determined based on the actual measurement data, and the measurement method and data processing method should comply with the HJ/T 91 regulations. When there is no actual measurement data, it can be determined by analogy with the existing enterprise data of the same scale and process in the same industry. 4.3.2 The inlet water of Fenton oxidation method shall meet the following conditions. a) Pollutants that are prone to produce toxic and harmful gases under acidic conditions (such as sulfide ions, cyanide ions, etc.) should not enter Fenton Oxidation process unit; b) The content of suspended solids in influent water should be less than.200 mg/L; c) Cl-, H2PO4 in the water should be controlled -, HCO3 -, oils and other inorganic ions or pollution that affect Fenton oxidation reaction The limit concentration should be determined based on the test results. 4.3.3 When the influent water of Fenton oxidation method does not meet the conditions specified in 4.3.2, corresponding pretreatment measures shall be taken according to the quality of the influent water. a) When Fenton oxidation method is used for pretreatment of biochemical treatment, coarse and fine grids, grit tank, sedimentation tank or coagulation sedimentation can be set Pond to remove floating matter, gravel and suspended matter, which are easy to remove pollutants; when Fenton oxidation is used for advanced wastewater treatment, it should be set Pretreatment of coagulation sedimentation or/and filtration process; b) When the concentration of soluble phosphate in the influent is too high, slaked lime should be added to remove part of the soluble phosphate through coagulation and precipitation; c) When the inlet water contains oil, a grease trap should be installed to remove the oil; d) When sulfur ions are contained in the influent water, chemical precipitation or chemical oxidation should be used to remove; when the influent water contains cyanide ions, it should be Take chemical oxidation to remove; e) When the influent water contains other substances that affect the Fenton oxidation reaction, corresponding removal measures should be taken according to the water quality to eliminate In addition to the effect on Fenton oxidation reaction. 4.3.4 When the Fenton oxidation method is used for the pretreatment of biochemical treatment, if the water quality and quantity of the influent change greatly, the Fenton oxidation process should be set before Set the conditioning tank, the design of the conditioning tank should refer to HJ 2021 implementation.

5 General requirements

5.2 The auxiliary system of the Fenton oxidation wastewater treatment project should include power supply and distribution, water supply and drainage, fire protection, HVAC, detection and control systems, etc. 5.3 Wastewater treatment plants (stations) using Fenton oxidation method shall comply with the following regulations. a) The site selection and overall layout should comply with the relevant regulations of GB 50014, and the general plan design should comply with the regulations of GB 50187; b) Flood control should meet the flood control standards of factories and industries, and have good drainage conditions; c) The fire protection design of buildings (structures) should meet the requirements of GB 50016 and GB 50160; d) The transportation and storage of the medicament should meet the requirements of GB 50160 and GB 15603.Sulfuric acid, hydrogen peroxide and liquid caustic soda (or hydrogen Sodium oxide) and other drugs are hazardous chemicals. Transportation management should also comply with GB 6944, GB 12268 and "Safety of Hazardous Chemicals". Regulations on the Management Regulations, etc.; e) Design and construction should take effective noise reduction measures, such as sound insulation, noise reduction, and greening. Noise and vibration control equipment The calculation should comply with GB/T 50087; the noise inside and outside the computer room should comply with GBZ 2.1, GBZ 2.2 and GB 3096 respectively The environmental noise emission of the factory boundary should meet the requirements of GB 12348; f) Occupational health and labor safety should be emphasized during design, construction and operation, and GBZ 1, GBZ 2.1, GBZ should be implemented 2.2 and relevant regulations in GB/T 12801; when completed and operated, safety and sanitation facilities should also be designed, constructed, and Run at the same time, and formulate corresponding operating procedures; g) The online monitoring system should be installed in accordance with relevant regulations, and the control system should be set up according to the process operation requirements to realize the automation of operation management. 5.4 The treatment and discharge of waste water, waste gas, waste residue and other pollutants generated during construction and operation shall meet the requirements of the state. Relevant discharge standards, pollution discharge permits and environmental impact assessment requirements.

6 Process design

6.1 General provisions 6.1.1 The process flow of Fenton oxidation wastewater treatment project mainly includes acid adjustment, catalyst mixing, oxidation reaction, neutralization, solid-liquid Separation, chemical dosing and sludge treatment system, the process flow diagram is shown in Figure 1. 6.1.2 The process design parameters of Fenton oxidation method should be determined through experiments according to the water quality, quantity and effluent requirements. 6.1.3 The operation mode of Fenton oxidation method should be continuous, and when the amount of wastewater is small, intermittent mode can be adopted. 6.1.4 Oxidation reaction tanks, neutralization tanks and solid-liquid separation facilities (such as coagulation sedimentation or air flotation tanks) should be no less than 2 (cells) each Parallel design. Oxidation reaction tank and neutralization tank should be equipped with water spray or defoaming spray; solid-liquid separation facilities should be equipped with slag skimming facilities. 6.1.5 The medicament mixing equipment and dosing equipment should be close to the Fenton oxidation facility, and the vulnerable equipment should be equipped with standby equipment. 6.1.6 The sludge treatment system includes sludge thickening and sludge dewatering. The thickening and dewatering process should be selected according to the sludge disposal requirements. Sewage The mud should be in accordance with the "National Hazardous Waste List" and GB 5085.7, HJ/T 298 and other national hazardous waste identification standards and identification methods Law to determine whether it is hazardous waste. 6.1.7 The waste (odor) gas generated by the process unit can be collected with a closed, negative pressure pipeline when necessary, and the collected waste (odor) gas can be recovered Use chemical or biological deodorization methods. 6.1.8 The composition of the process unit can be adjusted according to the wastewater quality. When the pH of the influent water meets the requirements of the oxidation reaction, there is no need to set up an acid adjustment unit. 6.1.9 When Fenton oxidation is used as a pretreatment process for wastewater biochemical treatment, a degassing tank, buffer tank or adding reducing agent should be added In addition to the residual hydrogen peroxide in the wastewater, it avoids affecting the operation stability of the subsequent biochemical treatment system. 6.2 Acidity adjustment 6.2.1 According to the optimal pH value conditions of the oxidation reaction tank, the pH value of wastewater should be adjusted by adding concentrated sulfuric acid or dilute sulfuric acid. The pH value should be controlled at 3.0～4.0. 6.2.2 The acid adjustment tank should adopt hydraulic stirring, mechanical stirring or air stirring, and the mixing time should not be less than 2 min. 6.2.3 Concentrated sulfuric acid or dilute sulfuric acid should be dosed with a metering pump, and an automatic control system such as an online pH value controller should be used to automatically adjust the dose. 6.3 Catalyst mixing 6.3.1 The catalyst can be ferrous sulfate, and the mixing process is completed in the catalyst mixing tank. 6.3.2 The catalyst mixing tank should adopt hydraulic stirring, mechanical stirring or air stirring, and the mixing time should not be less than 2 min. 6.3.3 The mass percentage concentration of ferrous sulfate solution should be less than 30%, and it should be dosed with a metering pump. 6.4 Oxidation reaction 6.4.1 Hydrogen peroxide solution should be added to complete the oxidation reaction in the oxidation reaction tank. 6.4.2 The oxidation reaction tank can adopt a completely mixed type or a plug flow type. The completely mixed type oxidation reaction tank should not be less than 2 stages. Flow or perforated wall connection. 6.4.3 The type of oxidation reaction tank should be comprehensively determined according to factors such as wastewater treatment scale, floor space and economy. 6.4.4 When the oxidation reaction tank adopts a tower type, an upflow reactor should be used, and the steel structure tower body should be made of stainless steel 316L and Coated glass flake anti-corrosion treatment. The tower reactor contains Fenton reagent mixing zone, water distribution zone and reaction zone. Mixing speed in mixing zone The value of the gradient G should not be less than 500 s-1, the water distribution area should be evenly distributed, and the outlet flow velocity of the water distribution hole should be 1.0 m/s～1.5 m/s. The flow ratio should not be less than 100%. The height to diameter ratio of the tower reactor should be between 1.0 and 5.0, and the height should not be higher than 15 m. 6.4.7 The hydraulic retention time of the oxidation reaction tank should be determined through experiments based on the quality, composition and effluent requirements of the incoming water. For pre During treatment, the hydraulic retention time of the oxidation reaction tank should be 2.0 h～8.0 h; when used for advanced treatment, the hydraulic retention time of the oxidation reaction tank The time should be 2.0 h～6.0 h. 6.4.8 The mixing can adopt hydraulic stirring, mechanical stirring or air stirring to ensure uniform mixing and prevent short flow and dead water zone. 6.5 Neutralization 6.5.1 Add lye to the neutralization tank to adjust the pH to neutral. Sodium hydroxide solution and sodium carbonate solution should be used for lye, but not Calcium hydroxide solution. When the effluent of Fenton oxidation process is directly discharged, the pH value should be adjusted to meet the requirements of solid-liquid separation and discharge requirements. When the Fenton oxidation effluent enters the subsequent treatment process, the pH value should be adjusted to meet the requirements of solid-liquid separation and subsequent treatment Process requirements. 6.5.2 The neutralization tank can adopt hydraulic stirring, mechanical stirring or air stirring, and the mixing time should not be less than 2 min. 6.5.3 When air agitation is not used in the oxidation reaction and neutralization process, an air-stirred deaeration tank should be set up, and the hydraulic retention time should not be less than 15 min, the air-water ratio should not be less than 5.1. 6.6 Solid-liquid separation 6.6.1 Separation or air flotation can be used to complete the solid-liquid separation. If the separation effect is not good, a coagulant or coagulant can be added. Refer to the technical requirements. According to HJ.2006 and HJ.2007. 6.6.2 The coagulant should be polyaluminum chloride (PAC), and the dosage should be 100 mg/L～200 mg/L; the coagulant should be polyaluminum chloride (PAC). Acrylamide (PAM), the dosage should be 3 mg/L～5 mg/L. 6.6.3 The types of agents and dosage ratios shall be determined based on experiments when conditions permit. 6.7 Pharmacy dosing 6.7.1 General provisions 6.7.1.1 The dosage of Fenton reagent, acid-base reagent, coagulant, coagulant aid and other agents shall be determined after testing according to the characteristics of wastewater. 6.7.1.2 The dosing method of Fenton reagent and coagulant should choose metering pump and install flow meter. 6.7.1.3 The Fenton reagent and coagulant dosing system shall include the storage, preparation, transportation, metering and dosing facilities (preparation) of the agent. 6.7.1.4 When the dosing mixing adopts hydraulic stirring, mechanical stirring or air stirring, the required stirring speed gradient G should be Control between 1000 s-1 and 500 s-1. 6.7.1.5 When the chemical reaction or coagulation reaction is carried out by means of hydraulic stirring, mechanical stirring or air stirring, the stirring speed The value of gradient G should be controlled between 70 s-1 and 50 s-1, decreasing step by step. 6.7.2 Pharmaceutical preparation 6.7.2.1 Modulation method a) The dissolution and dilution methods of medicaments (such as ferrous sulfate, sodium hydroxide, PAC and PAM, etc.) should be based on the dosage, The nature of the medicine is determined. The dissolution and dilution should adopt mechanical agitation, or hydraulic or air agitation; b) The dissolution concentration should be selected reasonably according to different solubility and freezing point, and the concentration of sulfuric acid should ensure that sulfuric acid is solidified at this concentration The temperature is lower than the lowest temperature in winter (see Table 1 for the freezing point of sulfuric acid); the concentration of ferrous sulfate dissolved drug should be prepared according to the mass percentage concentration ≤30%, When the water temperature is low, it should be prepared according to the mass percentage concentration ≤20%; the mass percentage concentration of hydrogen peroxide should be ≤30%; the concentration of liquid caustic soda should be ≤30%. If the alkalinity of the water used for the preparation of ...

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