A method for treating coal gasification wastewater

By employing steps such as gravity oil removal, vortex flotation, dynamic hydrolysis, IMC tank biodegradation, and ozone catalytic oxidation, the problem of coal gasification wastewater treatment has been solved, achieving efficient removal of pollutants, meeting the standards for reused water, and alleviating water shortages.

CN117682704BActive Publication Date: 2026-06-23HUAXIA BISHUI ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAXIA BISHUI ENVIRONMENTAL PROTECTION TECH CO LTD
Filing Date
2023-12-25
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Coal gasification wastewater has high concentrations of pollutants and is highly toxic, making it difficult to treat. In addition, water resources are scarce in Northwest and North China, and existing technologies cannot effectively treat coal gasification wastewater to meet discharge requirements.

Method used

The treatment process employs a multi-step approach, including gravity oil removal, vortex flotation, dynamic hydrolysis, IMC pool biodegradation, and oxidation devices. It combines coagulation and flocculation, flotation separation, chemical oxidation, and ozone catalytic oxidation to enhance mass transfer and achieve efficient removal of pollutants.

Benefits of technology

It has achieved efficient treatment of coal gasification wastewater, with the effluent meeting the standards for reuse, reducing the pollutant removal rate and solving the problem of water shortage.

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Abstract

The present application relates to a kind of coal gasification wastewater treatment methods, comprising: (1) coal gasification wastewater is input into gravity oil removal pool, and light oil and solid impurities are separated;(2) then the effluent is input into vortex cavity air floatation pool, and coagulation and flocculation and air floatation separation are carried out, remove solid suspended matter and dispersed oil droplets;(3) then the effluent is into dynamic hydrolysis pool treatment, while adding sodium phosphate solution, hydrolysis acidification is carried out, the end of dynamic hydrolysis pool is backflowed to the first end of itself by pump;(4) then the effluent is into IMC pool and is biodegraded, after water inlet, aeration, circulating biochemical treatment, the effluent is discharged into intermediate pool;(5) the effluent of intermediate pool is sequentially input into anoxic tank, aerobic tank and secondary sedimentation tank, and biochemical treatment is carried out;(6) the effluent of secondary sedimentation tank is input into air floatation sedimentation tank, after coagulation and flocculation decolorization, water body is into oxidation device, and chemical oxidation treatment is carried out, the effluent of oxidation device is separated after final sedimentation tank sedimentation, and the effluent is obtained.
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