A method and system for synergistic oxidation-reduction coupling treatment of ethyl thiocyanate-CNS in mineral processing wastewater using MABR oxygen stratification process.

By employing the MABR oxygen stratification process and an adaptive switching mechanism, the problem of treating ethyl thiocyanate nitrogen in lead-zinc mine beneficiation wastewater has been solved. This has enabled efficient and low-energy-consumption synergistic oxidation-reduction of ethyl thiocyanate nitrogen and CNS, improving treatment efficiency and system adaptability while simplifying the process flow.

CN121134980BActive Publication Date: 2026-05-26NORTHEAST NORMAL UNIVERSITY +2
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Patent Information

Application Number
CN202511284035.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-09-09
Publication Date
2026-05-26
Estimated Expiration
2045-09-09

AI Technical Summary

Technical Problem

Existing technologies are ineffective in treating ethyl nitrogen in lead-zinc mine beneficiation wastewater, leading to a significant increase in COD and NH4+-N in the wastewater. Furthermore, traditional methods suffer from problems such as high reagent consumption, easy saturation of adsorbents, severe membrane fouling, and high energy consumption.

Method used

The MABR oxygen stratification process is adopted to achieve synergistic oxidation-reduction treatment of ethyl nitrogen by controlling the dissolved oxygen sequence and adaptive switching mechanism, including high dissolved oxygen stage, normal dissolved oxygen stage and low dissolved oxygen stage. Combined with anaerobic reactor to enhance denitrification, a biofilm structure of aerobic zone, anoxic zone and anaerobic zone is formed.

Benefits of technology

It significantly improves the removal efficiency of ethyl sulfur nitrogen and ammonia nitrogen, reduces energy consumption, enhances the system's adaptability to water quality fluctuations, simplifies the process flow, and achieves synergistic removal of carbon, sulfur, and nitrogen with zero external carbon source.

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Abstract

This application relates to the field of wastewater treatment technology, specifically providing a method and system for the synergistic oxidation-reduction coupling treatment of ethylthionitrogen-C-N-S in mineral processing wastewater using a MABR oxygen stratification process. This method and system innovatively develops a time-sequential dissolved oxygen (DO) dynamic control strategy: by periodically / pulsally switching anaerobic-hypoxic-aerobic conditions, the oxidation and ammonification reactions of ethylthionitrogen are directionally enhanced, and the toxic inhibitory effects of intermediate products on functional bacteria are eliminated. Based on this strategy, the system can precisely utilize the spatial distribution of the biofilm oxygen gradient within a single MABR reactor to achieve a cascade reaction of ethylthionitrogen: "sulfur oxidation-ammonification → aerobic nitrification → anoxic denitrification"; or, for high-concentration ethylthionitrogen (>50 mg / L), it can couple a pre-anaerobic reactor to enhance ammonification detoxification and denitrification.
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