Method and device for synchronizing short-cut nitrification and denitrification with enhanced biological phosphorus removal

By introducing a side-flow anaerobic fermentation reactor into the mainstream reactor of a wastewater treatment plant, and utilizing the hydrolysis and fermentation of returned sludge to provide an internal carbon source, a short-cut nitrification-denitrification and biological phosphorus removal coupled system was constructed. This solved the problem of nitrogen and phosphorus removal under low carbon-to-nitrogen ratio, achieved efficient simultaneous treatment, and reduced operating costs.

CN122444341APending Publication Date: 2026-07-24TONGJI UNIV
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TONGJI UNIV
Filing Date
2026-05-09
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing wastewater treatment plants struggle to achieve simultaneous short-cut nitrification-denitrification and biological phosphorus removal when the carbon-to-nitrogen ratio is low. This makes it difficult to optimize the nitrogen and phosphorus removal processes simultaneously, and traditional processes require additional carbon sources and inhibitors, resulting in high operating costs.

Method used

A continuously stirred side-flow anaerobic fermentation reactor is set up in the main reactor. The internal carbon source is provided by the hydrolysis and fermentation of returned sludge. Combined with the parameter control of the main system, a stable short-cut nitrification-denitrification and biological phosphorus removal coupled system is constructed. The fermentation products are used as the internal carbon source to inhibit nitrite oxidizing bacteria and enhance the activity of polyphosphate-accumulating bacteria.

Benefits of technology

It achieves simultaneous short-cut nitrification and denitrification with enhanced biological phosphorus removal without the addition of external carbon sources and inhibitors, improving nitrogen and phosphorus removal efficiency, achieving a nitrite nitrogen accumulation rate of over 70%, enhancing system stability and flexibility, and reducing operating costs.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122444341A_ABST
    Figure CN122444341A_ABST
Patent Text Reader

Abstract

The present application belongs to the field of sewage denitrification and dephosphorization treatment technology, in particular to a method and device for simultaneous short-cut nitrification and denitrification and enhanced biological dephosphorization, which constructs a coupling system for simultaneous short-cut nitrification and denitrification and enhanced biological dephosphorization, introduces the main stream part of the reflux sludge into the side stream reactor for anaerobic hydrolysis and fermentation, and refluxes the fermentation product to the anaerobic tank and the anoxic tank of the main stream reactor to relieve the carbon source competition and the microbial growth contradiction in the denitrification and dephosphorization process. The present application realizes the short-cut nitrification and denitrification with nitrite as the intermediate product by the two-stage starting operation mode of the main stream, first constructs a stable enhanced biological dephosphorization process, and then regulates the nitrification and denitrification conditions on the basis of maintaining the enhanced dephosphorization performance. The present application can realize efficient denitrification and dephosphorization of municipal sewage without additional carbon source and inhibitors, and is suitable for upgrading and modification of the existing sewage denitrification and dephosphorization treatment process.
Need to check novelty before this filing date? Find Prior Art