A high-salinity wastewater recycling treatment method and treatment system

By combining electrochemical hardening, electrocoagulation, electroreduction oxidation, and chemical flocculation precipitation with microfiltration membrane separation, evaporation crystallization, and RO separation purification, the problems of low organic matter removal efficiency, easy scaling, and high energy consumption in the treatment of high-salt wastewater from coal chemical industry have been solved. This has achieved zero discharge and resource recovery of wastewater, reduced reagent consumption and operation and maintenance costs, and ensured stable water quality.

CN122102410APending Publication Date: 2026-05-29WUHAN TIANYUAN GROUP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN TIANYUAN GROUP CO LTD
Filing Date
2026-02-09
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing treatment processes for high-salt wastewater from coal chemical plants suffer from low organic matter removal efficiency, easy scaling of the system, high energy consumption, and difficulty in resource recovery, making it difficult to achieve zero discharge and resource utilization of wastewater.

Method used

The method combines electrochemical hardening, electrocoagulation, electroreduction oxidation and chemical flocculation precipitation with microfiltration membrane separation, evaporation crystallization and RO separation and purification. Through synergistic effects, hardness ions and organic matter are removed, reducing the risk of scaling, lowering energy consumption and achieving resource recovery.

Benefits of technology

It significantly improves the efficiency of organic matter removal, reduces the risk of scaling and energy consumption, achieves zero discharge and resource recovery of high-salinity wastewater, reduces reagent consumption and operation and maintenance costs, and ensures stable water quality that meets reuse requirements.

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Abstract

The application provides a high-salinity wastewater recycling treatment method and a treatment system, and comprises the following steps: sequentially performing electrochemical hardness removal treatment, electroflocculation treatment, electro-reduction oxidation treatment and chemical flocculation and sedimentation treatment on the high-salinity wastewater to obtain hardness-removed organic degradation treatment water and sludge; performing microfiltration membrane separation treatment on the hardness-removed organic degradation treatment water to obtain microfiltration product water; adjusting the pH of the microfiltration product water to 6-7; performing first evaporation treatment to obtain first evaporation product water and concentrated liquid; performing cooling crystallization and centrifugal separation on the concentrated liquid to obtain miscellaneous salt and mother liquor; performing second evaporation treatment on the mother liquor to obtain second evaporation product water; performing heat exchange treatment on the first evaporation product water, the second evaporation product water and the microfiltration product water; and performing RO separation and purification treatment on the heat-exchanged first evaporation product water and second evaporation product water to obtain recycled water. The application realizes efficient removal of hardness ions and organic matters in the high-salinity wastewater, makes the quality of the recycled water meet the industrial circulating water standard, and reduces the process energy consumption.
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