Process for advanced treatment of coking wastewater and coupled fluorine ion removal

A coking wastewater, advanced treatment technology, applied in the coking wastewater advanced treatment stage organic matter, chromaticity and fluoride ion coupling removal, cyanide field, can solve the problem that affects the stable operation of the coking wastewater zero discharge treatment system, affects the life of the evaporation crystallizer, fluorine There are no problems such as treatment effect, and the effect of improving fluorine removal effect, stable effect and low treatment cost is achieved

Pending Publication Date: 2021-12-14
上海宝汇环境科技有限公司
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  • Abstract
  • Description
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Problems solved by technology

Among them, biochemical treatment has no treatment effect on fluorine, and most of the fluoride ions will enter the subsequent treatment process, which is an important factor affecting the stable operation of the coking wastewater zero discharge treatment system
After the biochemically treated coking wastewater is concentrated by the membrane, the fluoride ion reaches more than 100mg/l, and enters the subsequent electrodialysis treatment. The fluoride ion...

Method used

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  • Process for advanced treatment of coking wastewater and coupled fluorine ion removal
  • Process for advanced treatment of coking wastewater and coupled fluorine ion removal
  • Process for advanced treatment of coking wastewater and coupled fluorine ion removal

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Effect test

Embodiment 1

[0026] The first and second phase treatment project of coking wastewater in a company, the treated water comes from solvent dephenolization, wastewater after ammonia distillation, coal fine process drainage, chemical production process drainage, COG condensate water and various accident drainage, mainly by biological anoxic and aerobic treatment, mixed It consists of three parts: coagulation filtration treatment and sludge dehydration treatment. The design processing scale is 5800m 3 / d, handle direct efflux.

[0027] The COD content of the influent water in the physical and chemical treatment stage after biochemical treatment of coking wastewater is 150-500mg / L, and the cyanide content is 1-2mg / L. The chromaticity is in the range of 128-256 times, the fluoride is in the range of 30-60mg / L, and the wastewater discharge requirements meet the discharge limit value of pollutant discharge standard for coking chemical industry (GB16171-2012). Table 2 Newly established enterprise w...

Embodiment 2

[0032] In the coking wastewater treatment area of ​​a company, the raw water is composed of gas condensate water, residual ammonia water, ammonia distillation discharge liquid, and hydrogen production wastewater. The two-stage AO+physicochemical+constructed wetland process is mainly adopted. The design processing scale is 6200m 3 / h, handle direct efflux.

[0033] The COD content of the biochemical effluent is 200-600mg / L, and the cyanide content is 0.5-3mg / L. The chromaticity is in the range of 128-256 times, the fluoride is in the range of 30-70mg / L, and the direct discharge of wastewater is required to meet the indirect discharge standard of pollutants in the coking chemical industry.

[0034]In the physical and chemical treatment stage of biochemical effluent, the original physical and chemical treatment device was modified, and 400mg / L of BH type agent was added to the first physical and chemical reaction tank, stirred and reacted for 30min, and then entered into the sec...

Embodiment 3

[0038] A coke oven wastewater treatment station adopts the technological process of pretreatment + biochemical treatment + post-treatment, and the volume of wastewater treated after biochemical treatment is about 140m 3 / h, the COD content of biochemical effluent is 200-300mg / L, the cyanide content is 0.5-2mg / L, the chromaticity is in the range of 128-256 times, and the fluoride is in the range of 30-40mg / L. After treatment, it enters the advanced treatment device and requires COD Content- <10mg / L.

[0039] In the physical and chemical treatment stage after the biochemical effluent, set up a coagulation reaction tank and a sedimentation tank. Add 300mg / L of BH type reagent to the first physical and chemical reaction tank, stir and react for 30min, and then enter the second physical and chemical reaction tank; add hydrogen to the second reaction tank Adjust the pH to neutral with sodium oxide, then add 600 mg / L of defluorinating agent, stir and react, enter the coagulation reac...

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Abstract

The invention provides a process for advanced treatment of coking wastewater and coupled fluorine ion removal. The process comprises the following steps: allowing biochemical effluent of the coking wastewater to enter a coagulation tank 1# from a raw water tank, adding 300-600 mg/L of a BH type advanced treatment agent into the wastewater, then performing stirring reaction, and then allowing the wastewater to enter a coagulation tank 2#, wherein the BH type advanced treatment agent is a composite agent which mainly comprises, in percentage by weight, 5-60 wt% of carbon powder, 2-50 wt% of a cyanogen removal agent and 20-60 wt% of a coagulant; adjusting a pH value in the coagulation tank 2# to 6-7, then adding a fluorine removal agent, carrying out sufficient stirring and reacting, and then allowing the wastewater to enter a coagulation reaction tank 3#, wherein the main component of the fluorine removal agent is calcium chloride, and the dosage of the fluorine removal agent is 900-2000 mg/L; adding 0.1-0.3% of polyacrylamide into the coagulation reaction tank 3#, carrying out slow stirring and uniform mixing, and allowing the wastewater to enter a sedimentation tank; and enabling solid to be formed through flocculation and sedimentation in the sedimentation tank, conducting solid-liquid separation, and allowing the treated wastewater to enter an effluent trough. The removal process disclosed by the invention is suitable for removing pollution factors such as low-concentration COD (Chemical Oxygen Demand), cyanide and fluorine ions in the wastewater and is a practical and simple agent treatment process.

Description

technical field [0001] The invention relates to the field of coking wastewater treatment, in particular to a process method for coupled removal of organic matter, cyanide, chroma and fluorine ions in the advanced treatment stage of coking wastewater. Background technique [0002] The source of coking wastewater mainly comes from the residual ammonia water produced by the coke oven, the gas refining process and the subsequent chemical production deep processing process. Wastewater has the characteristics of high organic content, deep color, more harmful substances and refractory substances, and belongs to high-concentration refractory organic wastewater. After biochemical treatment of wastewater, COD, cyanide, fluoride, chroma, etc. cannot meet the wastewater discharge standards, and further advanced treatment is required. Among them, biochemical treatment has no treatment effect on fluorine, and most of the fluoride ions will enter the subsequent treatment process, which is...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/14C02F101/18C02F103/34
CPCC02F9/00C02F2101/14C02F2103/34C02F1/5281C02F2001/007C02F1/283C02F2101/18C02F2209/08C02F1/66C02F2209/06C02F1/56
Inventor 林玉姣王洪洋朱筱滢杨翠平
Owner 上海宝汇环境科技有限公司
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