A method for simultaneous nitrification and denitrification and chromium remediation of high ammonia-nitrogen wastewater based on a microorganism-promoter combination

By culturing SND bacteria under high-oxygen conditions and adding promoters NaN3, alanine, and PMo12, the problem of reduced microbial activity in high-chromium wastewater was solved, achieving efficient nitrogen conversion and chromium remediation, and improving wastewater treatment efficiency.

CN118754312BActive Publication Date: 2026-02-10SOUTH CHINA UNIV OF TECH
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Patent Information

Application Number
CN202410952852.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-07-16
Publication Date
2026-02-10
Estimated Expiration
2044-07-16

AI Technical Summary

Technical Problem

The heavy metal chromium in high-chromium wastewater has high biotoxicity to SND bacteria, leading to reduced microbial activity and affecting the treatment efficiency of high ammonia nitrogen wastewater.

Method used

SND (Synthetic Nitrification and Denitrification) microbial strains were cultured under high-oxygen conditions, and biological promoters NaN3, alanine, and PMo12 were added to promote microbial growth and electron transfer, reduce the toxicity of heavy metal chromium, and achieve simultaneous nitrification, denitrification, and chromium remediation.

Benefits of technology

It improves the bioactivity and treatment efficiency of microorganisms under high chromium conditions, achieves efficient nitrogen conversion and chromium removal, simplifies the treatment process, and reduces costs.

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Abstract

The application discloses a high-ammonia-nitrogen wastewater simultaneous nitrification and denitrification and chromium remediation method based on a microorganism-promoter combination. 12 The combination is composed of simultaneous nitrification and denitrification bacteria and sodium azide (NaN3), alanine and dodecamolybdenum phosphate (PMo 12 ) and is used for detoxifying dissolved heavy metal chromium and improving denitrification efficiency. The method is to culture SND simultaneous short-cut nitrification and denitrification biological bacteria under aerobic conditions, inoculate the biological bacteria into a high-chromium solution, add biological promoters, promote the growth of microorganisms and the conversion of nitrogen, continuously receive and provide electrons in a reversible oxidation-reduction process, thereby reducing the total activation energy of the reaction and efficiently detoxifying heavy metal chromium. The microorganism-promoter combination technology obtained in this way can not only realize efficient simultaneous nitrification and denitrification in high-ammonia-nitrogen wastewater, but also maintain the biological activity of the SND bacteria in a high-chromium environment, thereby providing reliable technical support for efficient chromium removal and toxicity remediation of high-ammonia-nitrogen wastewater.
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