Coal chemical wastewater treatment process

The method of generating cuprous chloride from copper sulfate pentahydrate and L-cysteine, combined with Fenton oxidation of Fenton iron sludge particles and peroxides, solves the problem of efficient removal of chloride ions and organic pollutants in coal chemical wastewater, reduces costs and improves treatment efficiency.

CN119750759BActive Publication Date: 2026-06-09HENAN POLYTECHNIC UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HENAN POLYTECHNIC UNIV
Filing Date
2025-01-24
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing technologies struggle to simultaneously and efficiently remove high concentrations of chloride ions and recalcitrant organic pollutants, especially phenols, from coal chemical wastewater. Furthermore, advanced oxidation technologies are less effective in the presence of high chloride ions, resulting in high treatment costs.

Method used

Copper sulfate pentahydrate and L-cysteine ​​are reacted to generate cuprous chloride, which is then subjected to Fenton oxidation with Fenton iron sludge particles and peroxides. The Cu2+ and Fe2+ cycling mechanism is used to increase the amount of free radicals generated and enhance the degradation effect of organic matter.

Benefits of technology

It achieves efficient removal of chloride ions and organic pollutants from coal chemical wastewater, reduces treatment costs, improves organic matter degradation efficiency, has a wide applicable pH range, and reduces reaction time and peroxide dosage.

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Abstract

This invention provides a coal chemical wastewater treatment process, belonging to the field of industrial wastewater treatment and reuse technology. The invention involves mixing copper sulfate pentahydrate, L-cysteine, and coal chemical wastewater for a chloride ion removal reaction. After the reaction, initial separation is performed to obtain a solid precipitate and a supernatant. The solid precipitate is then subjected to a second washing and separation to obtain crude cuprous chloride. The supernatant is mixed with Fenton iron sludge particles, followed by the addition of peroxide for Fenton oxidation. This process can simultaneously and efficiently remove chloride ions and recalcitrant organic pollutants. The cuprous chloride precipitate, a byproduct of chloride ion removal, has high industrial value and can be recycled to reduce treatment costs. The residual copper ions and cysteine ​​can be used as peroxide activators to improve organic matter removal efficiency.
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