Biological deamination treatment process based on iron-carbon coupling method

By employing a sandwich-structured iron-carbon composite packing material and a sulfur autotrophic bacteria-iron reducing bacteria composite community in wastewater with a low C/N ratio, a stable electron transport network is formed. The denitrification and nitrification modes are switched using hydrogen signals, thus solving the problem of deep nitrogen removal in wastewater with a low C/N ratio and achieving efficient ammonia nitrogen degradation and improved electron transfer efficiency.

CN121990692APending Publication Date: 2026-05-08GUANGDONG TAIQUAN ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Application Number
CN202610343999.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-20
Publication Date
2026-05-08

AI Technical Summary

Technical Problem

Low C/N ratio wastewater contains low organic carbon sources, making it difficult for traditional biological methods to achieve deep denitrification. Adding external carbon sources can easily cause secondary pollution and increase CO2 emissions, thus limiting the application of external carbon source denitrification in deep denitrification of low C/N ratio wastewater.

Method used

The iron-carbon composite packing material with a sandwich structure is used to form a double-layer biofilm by cultivating a complex community of sulfur autotrophic bacteria and iron reducing bacteria. The hydrogen generated by the iron-carbon reaction is used as a signal source to switch between denitrification and nitrification modes, forming a stable electron transport network. This achieves self-powered electron transport and bacterial symbiosis, avoiding the need for an external carbon source.

Benefits of technology

It achieves continuous and efficient ammonia nitrogen degradation in wastewater, reduces sludge production, lowers power consumption, improves electron transfer efficiency, extends the oxidation process cycle, and enhances treatment effectiveness.

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Abstract

The invention relates to the technical field of wastewater treatment, and particularly discloses a biological deamination treatment process based on an iron-carbon coupling method. The invention discloses a biological deamination treatment process based on an iron-carbon coupling method. The biological deamination treatment process comprises the following steps: pretreatment: filling a reactor with iron-carbon composite filler with a sandwich structure; then circularly contacting the surface of the filler with an iron reducing bacteria solution and a sulfur autotrophic bacteria solution, and culturing and biofilm culturing to form a composite membrane; wherein the iron-carbon composite filler with the sandwich structure comprises two conductive net layers and an iron powder layer arranged between the two net layers; wastewater treatment: adjusting the pH and temperature of the wastewater, then introducing the wastewater into a reactor, and using hydrogen generated by iron-carbon reaction as a signal source: when the hydrogen concentration is greater than 0.5%, automatically closing aeration to enter a denitrification mode, and when the hydrogen concentration is less than 0.2%, starting aeration to convert into a nitrification mode; the composite membrane formed in the reactor continuously degrades ammonia nitrogen, and deamination treatment is completed.
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