HJ 2022-2012Technical specifications for coking wastewater treatment (English PDF)

3.2 Coking wastewater coking wastewater

It refers to waste water generated during coal coking, gas purification, chemical product recovery and chemical product refining.

3.3 Excess ammonia water

Refers to the coke oven waste gas condensate after separation of tar residue and tar, the output of which depends mainly on the moisture content of coking coal.

3.4 Steamed ammonia waste water from ammonia stripper

Refers to the wastewater after removal of volatile ammonia and fixed ammonia by steaming ammonia.

3.5 Anoxic denitrification anaerobic denitrification

Refers to the process of denitrifying denitrification by using anoxic oxygen for anaerobic respiration under anaerobic conditions.

3.6 Reflux nitrified liquid

Refers to aerobic nitrifying liquid containing nitrate and nitrite.

3.7 Uniform and pool equalizing tank

Refers to the pool used to homogenize the quality of coking wastewater.

3.8 Semi-coke carbocoal

Also known as blue charcoal, it refers to the solid product obtained by dry distillation of coal at low temperature (500 ~ 700) °C.

5.1 General provisions

5.1.1 Coking should adopt a clean production process to reduce the coking wastewater.

5.1.2 The treatment of coking wastewater should be based on the principles of classified collection and quality treatment.

5.1.3 Contaminants generated during the water treatment process should be disposed of properly.

5.1.4 The selection of coking wastewater treatment technology should follow the advanced and feasible technology, less secondary pollution, less capital investment, and lower operating costs.

The principle of simple system maintenance.

5.1.5 Coking wastewater should be treated by a combined treatment process of "pretreatment biochemical treatment and post-treatment deep purification treatment".

5.1.6 Semi-coke (blue carbon) wastewater, polyphenol-rich phenol refined oil water separation water, small-scale or low-concentration in the case of technical and economical rationality, the refined wastewater of industrial products may be treated by incineration according to relevant regulations.

5.1.7 Wastewater treatment The technical requirements for the physical and chemical treatment of waste liquid generated in the chemical production process are as follows.

(1) For conventional coking other than blue carbon (semi-coke) production (including tar processing and benzene refining) High-concentration coking wastewater should be treated with water volume adjustment, degreasing and steaming (requiring removal of fixed ammonia);

(2) Independent tar processing and high concentration coking wastewater produced by benzene refining enterprises should be solvent extracted for dephenolation or steaming.

Steam dephenolization; if necessary, steaming ammonia should be carried out.

(3) For semi-coke (blue carbon) wastewater, degreasing, dephenolization and steaming should be carried out. In the degreasing measures can not effectively remove milk in the case of chemical oils and low-boiling alkali-soluble oils, chemical processes should be used with solvent dephenolation, steam dephenolation and ammonia distillation.

5.1.8 The process selection of wastewater biochemical treatment should follow the following principles.

(1) The biochemical treatment of wastewater should adopt a biological denitrification treatment process and should include a pre-denitrification section.

(2) In the case where the chemical process cannot ensure the effect of deoiling, dephenolization and ammonia treatment of the semi-coke (blue carbon) wastewater, the wastewater the biochemical treatment process should be used with caution.

5.1.9 Partial process selection for wastewater deep purification treatment should follow the following principles.

(1) Depth purification used when the water is returned to the biochemical treatment system for dilution or defoaming water after deep purification treatment the treatment process should be effective in removing polycyclic and heterocyclic organic pollutants remaining in the wastewater after biochemical treatment.

(2) When the water is used as the supplementary water for the circulating cooling water system after the deep purification treatment, the deep purification treatment process should be completed.

Water quality standards for supplemental water.

(3) Membrane concentrated waste liquid rich in high concentration of organic pollutants shall not be used for quenching, washing coal and iron making slag.

5.1.10 The core facilities for the physical and chemical treatment of coking wastewater should be configured in no less than two separate series.

5.1.11 For the construction of the main project in phases, the coking wastewater treatment should be matched with the overall plan.

5.1.12 An accident pool should be set up.

5.2 Construction scale

5.2.1 The construction scale of the coking wastewater treatment project should be consistent with the construction scale of the main coking project, and should be considered for phased construction.

The need for future development.

5.2.2 The construction scale of the coking wastewater treatment project should be determined according to the amount of coking wastewater treated. No other data can be used the test time can be determined according to Table 1, in which the pre-treatment and biochemical treatment water volume has included low-concentration coking wastewater and pollution in the factory area.

The amount of rainwater in the water and production plant area.

Table 1 Corresponding relationship between the coking production scale and the designed water volume in each stage of coking wastewater treatment

Coking scale (10,000 t coke/a) 60 ~ 70 90 ~ 100 120 ~ 130 180 ~.200 260 ~ 300 360 ~ 400 540 ~ 600 Remarks High concentration wastewater (m3/h) <=22 <=35 <=46 <=70 <=105 <=138 <=200 The amount of refined wastewater from some chemical products Ammonia wastewater (m3/h) 20~25 35~40 46~50 70~80 100~120 140~160 210~235 Pretreatment (m3/h) 30~35 45~50 60~65 90~100 130~150 180~200 270~300 Biochemical treatment (m3/h) 50~60 80~90 110~120 150~180 220~260 300~360 450~540 Biochemical post-treatment (m3/h) 50~60 80~90 110~120 150~180 220~260 300~360 450~540 Sludge treatment (m3/h) 0.5~4 1~6 1.3~8 2~12 2.5~15 3.5~25 5.5~40 Related to the nature of the flocculant used

5.2.3 The determination of the construction scale of the coking wastewater treatment project should take into account the disadvantages of increased water content of coking coal in the rainy season.

factor.

5.2.4 The scale of coking wastewater treatment produced by the independent chemical product refining process can be based on the number of high-concentration wastewater in Table 1.

The value corresponds to the corresponding processing scale.

5.2.5 Coking enterprises with chemical products refined processing, the scale of wastewater treatment should be adjusted accordingly.

5.3 System composition

5.3.1 The physical and chemical treatment of the waste liquid generated in the chemical production process belongs to the recycling of chemical products, and is designed by the coking chemical industry.

The chemical production workshop is responsible for operation management.

5.3.2 Coking wastewater treatment system should include wastewater pretreatment, wastewater biochemical treatment, wastewater biochemical treatment, advanced treatment and its supporting secondary pollution control system, instrumentation and control system, analysis and testing system, and ancillary facilities.

5.3.3 Wastewater pretreatment should include the following parts.

(1) Collection, storage, pressurization and transportation facilities for low-concentration coking wastewater;

(2) A water conditioning tank for coking wastewater;

(3) The water quality of the coking wastewater is equal to the pool;

(4) When the oil content of coking wastewater is high, degreasing facilities should be added.

5.3.4 Wastewater biochemical treatment should include the following parts.

(1) Anaerobic hydrolysis acidification facility (2) anoxic biological denitrification facilities;

(3) aerobic biological oxidation and aerobic biological nitrification facilities;

(4) Secondary sedimentation tank of biochemical system of activated sludge method;

(5) Submersible mixing system for anoxic activated sludge process system;

(6) Aeration system, defoaming system, dosing system, and return sludge system of aerobic activated sludge process;

(7) Filling system, water distribution system and water collecting system of biofilm biochemical reaction facility;

(8) Nitrification liquid reflux system;

(9) Excess sludge discharge system and supernatant discharge system.

5.3.5 Wastewater biochemical treatment should include the following parts.

(1) Wastewater mixing, reaction, and sedimentation facilities;

(2) Pharmaceutical preparation and dosing systems;

(3) Drainage system;

(4) Wastewater filtration facilities;

5.3.6 The advanced treatment process can be.

(1) Membrane process;

(2) Strong oxidation process;

5.3.7 Secondary pollutant control should include the following parts.

(1) The collection, treatment, storage and disposal of waste oil from the pretreatment system;

(2) Biochemical treatment of residual activated sludge and flocculation and precipitation of chemical sludge for dewatering and disposal;

(3) Noise prevention.

5.3.8 Auxiliary facilities should include the following parts.

(1) blast air system;

(2) Uniform water distribution and water collection system of biofilm system (3) Liquid storage, conditioning and pressurization lifting systems;

(4) Preparation and dosing systems for pharmaceuticals;

(5) Power distribution systems, etc.

5.3.9 The instrumentation and control system shall include the following parts.

(1) control system;

(2) Flow, temperature, pressure, and liquid level detection;

(3) automatic interlock control of water pump and liquid level;

(4) On-line detection of water quality indicators and water quantity such as system pH, DO, ammonia nitrogen, COD;

(5) Monitoring of distribution system voltage, working current, etc.;

(6) Water quality online monitoring system, etc.

5.3.10 The analysis and analysis system should be configured to meet the requirements of wastewater treatment operation management and environmental protection monitoring.

5.3.11 The coking wastewater treatment station set up in the factory shall be considered by the whole plant.

5.3.12 The waste oil collected during the pretreatment of wastewater is recycled or blended into coking coal after gravity dewatering treatment;

5.3.13 The excess sludge generated during the biochemical treatment of wastewater and the chemical sludge generated during the post-treatment of wastewater shall be as follows Dispose of.

(1) Directly sent to the inlet end of the water coke sedimentation tank of the water quenching system, the sludge is trapped in the powder coke of the powder coke sedimentation tank, and the powder coke the coal feeding yard is incorporated into the coking coal;

(2) After the mechanical pressure filtration dehydration or the powder coke percolation dehydration, the coal supply yard is mixed into the coking coal.

5.3.14 The separated water produced during the separation of oil and water and sludge dewatering shall be returned to the wastewater pretreatment system.

5.3.15 The process selection, treatment standard and system composition of the deep purification treatment should meet the water quality requirements of the circulating water supplement.

5.4 Site selection and layout

5.4.1 The site location of the coking wastewater treatment station shall comply with GB 50014 and relevant regulations, and shall be avoided in the explosion-proof area.

The windward side of the small frequency wind direction is far away from the living area.

5.4.2 The layout of the station shall be such that the operating office is placed on the downwind side of the annual minimum frequency wind direction.

5.4.3 The facilities for wastewater treatment should be concentrated in the same area and should not be dispersed.

5.4.4 Wastewater treatment buildings should adopt a multi-layered three-dimensional arrangement.

5.4.5 Wastewater treatment structures shall be arranged according to the process in priority, and the two structures connected by gravity flow shall be arranged adjacent to each other.

Fluid bypass or long distance transport should be reduced or avoided.

5.4.6 The distribution of buildings and structures and the selection of equipment shall be such that the number of communication pipes between systems is the minimum and the length is the shortest.

5.4.7 Parallel series of structures should be geometrically symme...