Coal chemical wastewater treatment process

By using copper sulfate pentahydrate, L-cysteine ​​and Fenton oxidation technology in coal chemical wastewater treatment, the problem of difficulty in removing high concentrations of chloride ions and organic pollutants at the same time in the prior art is solved, and efficient wastewater treatment effect is achieved.

CN119750759AActive Publication Date: 2025-04-04HENAN POLYTECHNIC UNIV
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Patent Information

Application Number
CN202510121869.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-24
Publication Date
2025-04-04
Estimated Expiration
2045-01-24

AI Technical Summary

Technical Problem

The prior art is difficult to efficiently remove high concentrations of chloride ions and difficult-to-degrade organic pollutants in coal chemical wastewater at the same time. Especially in advanced oxidation processes, the presence of chloride ions will affect the activation effect of active free radicals, resulting in unsatisfactory treatment effect.

Method used

The mixed reaction of copper sulfate pentahydrate, L-cysteine ​​and coal chemical wastewater was used to remove chloride ions to produce copper chloride and crystals. Then, the organic pollutant degradation was used through Fenton oxidation technology.

Benefits of technology

The removal rate of high concentration chloride ions in coal chemical wastewater has reached more than 80%, and the removal rate of organic pollutants has been significantly improved, and the pH range is applicable to a wide range, which reduces treatment costs and saves resources.

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Abstract

The invention provides a coal chemical wastewater treatment process, and belongs to the technical field of industrial wastewater treatment and recycling. The method comprises the following steps: mixing copper sulfate pentahydrate, L-cysteine and coal chemical industry wastewater, carrying out chloride ion removal reaction, and carrying out primary separation after the reaction is ended, so as to obtain solid precipitate and supernatant liquid; carrying out secondary washing separation on the solid precipitate to obtain crude cuprous chloride; and adding the supernatant liquid into Fenton iron mud particles, mixing, then adding peroxide, mixing, and carrying out Fenton oxidation. According to the treatment process, the chloride ions and the refractory organic pollutants can be efficiently removed at the same time, the byproduct cuprous chloride precipitate for removing the chloride ions has extremely high industrial value and can be recycled, the treatment cost is reduced, and the residual copper ions and cysteine can serve as peroxide activators to improve the organic matter removal efficiency.
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