A device and method for realizing autotrophic and heterotrophic coupled advanced denitrification and dephosphorization of low carbon-nitrogen ratio sewage based on a continuous flow membrane aeration biofilm reactor

By combining a continuous flow membrane biofilm reactor (MABR) with short-cut denitrification and anaerobic ammonia oxidation technologies, the dissolved oxygen distribution and carbon source recovery are optimized, solving the problems of low nitrogen and phosphorus removal efficiency and high energy consumption in wastewater with low carbon-to-nitrogen ratio, and achieving stable and efficient deep nitrogen and phosphorus removal.

CN120589931BActive Publication Date: 2026-07-24BEIJING UNIV OF TECH
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Patent Information

Application Number
CN202510598894.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-05-09
Publication Date
2026-07-24
Estimated Expiration
2045-05-09

AI Technical Summary

Technical Problem

Existing technologies have low nitrogen and phosphorus removal efficiency, high energy consumption, and are sensitive to water quality fluctuations when treating wastewater with low carbon-to-nitrogen ratios, making it difficult to achieve stable and efficient deep nitrogen and phosphorus removal.

Method used

A continuous flow membrane biofilm reactor (MABR) is adopted, combining short-cut denitrification and anaerobic ammonia oxidation technologies. The dissolved oxygen distribution is optimized through the bubble-free aeration and biofilm stratification structure of the MABR, and carbon source recovery is combined with sludge fermentation to form a nitrogen and phosphorus removal system with low energy consumption and low sludge yield.

Benefits of technology

It achieves efficient nitrogen and phosphorus removal from wastewater with low carbon-to-nitrogen ratio, reduces energy consumption and sludge production, improves system stability and resistance to shock loads, and reduces the need for external carbon sources.

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Abstract

The application discloses a device and method for realizing autotrophic and heterotrophic coupling deep denitrification and dephosphorization of low carbon-nitrogen ratio sewage based on a continuous flow membrane aerated biofilm reactor. A hollow fiber membrane is arranged in the continuous flow reactor, and an oxygen concentration gradient is formed through bubble-free membrane aeration technology. In the biofilm area, spatial partitioning of functional bacteria such as nitrifying bacteria and anaerobic ammonia oxidation bacteria is established, two anoxic zones realize efficient denitrification through short-cut denitrification coupled with anaerobic ammonia oxidation (PD / A) and simultaneous nitrification and denitrification. In terms of phosphorus removal, the system adopts an anaerobic-aerobic operation mode, and the polyphosphorus bacteria release phosphorus in the anaerobic state and absorb excess phosphorus in the aerobic state, and finally, phosphorus removal is realized through residual sludge discharge. The system integrates an internal carbon source extraction process, recovers sludge carbon source to supplement the electron donor required for denitrification, and reduces operation cost and carbon emission. The continuous flow MABR denitrification system strengthens the denitrification efficiency of the PD / A system, is suitable for large-scale operation, and realizes efficient and stable deep denitrification of low carbon-nitrogen ratio municipal sewage treatment plants.
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