Process for treating cyanide-containing wastewater

By employing a two-stage electrochemical oxidation process and utilizing BDD anodes and suitable electrode materials, the efficient near-zero discharge of cyanide-containing wastewater was achieved. This solved the problems of complex processes and high energy consumption in existing technologies, and achieved complete mineralization of cyanide and compliance with emission standards.

CN122444273APending Publication Date: 2026-07-24CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2025-01-24
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing cyanide-containing wastewater treatment processes are complex, energy-intensive, and inefficient, and it is difficult to achieve complete mineralization of cyanide, resulting in non-compliance with emission standards.

Method used

A two-stage electrochemical oxidation process is adopted. The first stage utilizes the ·OH generated by the BDD anode to rapidly oxidize and decompose cyanide. The second stage achieves efficient near-zero treatment through the synergistic effect of ·OH and H2O2. Suitable electrode materials and process parameters are selected to simplify the process and reduce energy consumption.

Benefits of technology

It achieves complete mineralization of cyanide-containing wastewater, simplifies the treatment process, reduces energy consumption, avoids secondary pollution, and meets emission standards.

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Abstract

The application provides a cyanide-containing wastewater treatment process, which comprises the following steps: (1) the cyanide-containing wastewater enters a first electrochemical oxidation reaction unit for electrolysis treatment, and the treated wastewater is separated to obtain supernatant and precipitate; (2) under the condition of aeration, the supernatant obtained in step (1) enters a second electrochemical oxidation reaction unit for electrolysis treatment, and the supernatant obtained after the treated wastewater is separated by sedimentation is discharged up to the standard. The cyanide in the wastewater is completely mineralized by adopting two-stage electrochemical oxidation treatment, and the COD is also greatly reduced, so that the supernatant separated by solid-liquid separation can be discharged up to the standard.
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Citation Information

Patent Citations

  • Zero-emission system and method for high-salt cyanide wastewater

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  • Novel method for advanced oxidation treatment of cyanide through electro-catalysis coupling ultraviolet light assistance

    CN114835210A