An environmentally friendly coking wastewater sodium sulfate evaporation mother liquor decolorization process and system

Through the environmentally friendly decolorization process of sodium sulfate evaporated mother liquor in coking wastewater, including pretreatment, oxidation treatment and decolorization treatment, the high color problem caused by the difficulty of degradation of organic matter and pigments in coking wastewater is solved, and efficient COD removal and decolorization is achieved, with environmentally friendly advantages.

CN115974299BActive Publication Date: 2025-03-25江苏鑫林环保设备有限公司
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Patent Information

Application Number
CN202211434195.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-16
Publication Date
2025-03-25
Estimated Expiration
2042-11-16

AI Technical Summary

Technical Problem

The difficult-to-degrade organic matter and pigments in coking wastewater lead to high color of biochemical water. The existing technologies such as biochemical methods and activated carbon adsorption have low efficiency or environmental protection problems.

Method used

The environmentally friendly decolorization process of evaporating mother liquor of sodium sulfate in coking wastewater is adopted, including pretreatment, oxidation treatment and decolorization treatment. The pretreatment is damaged by anaerobic environment to degrade organic matter. The oxidation treatment is made of chlorine dioxide for oxidation and decolorization. The decolorization treatment is made of alternating addition of modified decolorizer and sodium chloride solution, combining ultraviolet lamp and nanofiltration technology.

Benefits of technology

It has achieved more than 99% COD removal rate and efficient decolorization in coking wastewater, avoiding the generation of additional waste gas and pollutants, and has an environmentally friendly effect.

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Abstract

The invention discloses an environmentally friendly decolorization process of sodium sulfate evaporation mother liquor of coking wastewater, which comprises the following steps: S1, evaporation treatment: firstly introducing the pretreated coking wastewater into an evaporation system for evaporation to obtain sodium sulfate evaporation mother liquor; S2, oxidation treatment: introducing the sodium sulfate evaporation mother liquor into an oxidation tank, adding an oxidant for oxidation treatment, and then obtaining concentrated sodium sulfate evaporation mother liquor through ultrafiltration; S3, decolorization treatment: adjusting the pH of the concentrated sodium sulfate evaporation mother liquor obtained in S2, and then introducing the concentrated sodium sulfate evaporation mother liquor into a decolorization system under aerobic conditions for decolorization treatment; the system provided according to the decolorization process comprises a pretreatment tank, an evaporation system, a centrifuge, an oxidation tank, a pH adjustment tank and a decolorization system connected in sequence; the coking wastewater decolorization process of the invention uses double decolorization treatment of oxidation and decolorization to remove substances in the coking wastewater that are difficult to degrade and cause chromaticity and reduce the concentration of COD, and the process of the invention is harmless to the environment.
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