Apparatus and method for rapid start-up of short-cut nitrification process

By inoculating secondary sedimentation tank sludge into a sequencing batch reactor and adding polyurethane biological sponge carrier, combined with the endogenous denitrification capacity and low dissolved oxygen environment of Candidatus Contendobacter, and adopting a segmented influent and post-aeration incremental strategy, a rapid start-up short-cut nitrification process was achieved. This solved the problems of slow start-up speed and high cost in existing technologies, and provided an efficient and stable PN process start-up method.

CN120208414BActive Publication Date: 2026-06-30BEIJING UNIV OF TECH
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Patent Information

Application Number
CN202510385435.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-03-29
Publication Date
2026-06-30
Estimated Expiration
2045-03-29

AI Technical Summary

Technical Problem

Existing short-cut nitrification processes have slow start-up speeds, and traditional methods are costly and may cause toxic damage to biological systems, making it difficult to achieve rapid and stable PN process start-up in practical applications.

Method used

A sequencing batch reactor was used, inoculated with sludge from the secondary sedimentation tank and added with polyurethane biological sponge carrier. Through a segmented influent and post-aeration incremental strategy, combined with the endogenous denitrification capacity of Candidatus Contendobacter, the enrichment of AOB was driven in a low dissolved oxygen environment. With the help of low alkalinity and multiple aeration strategies, the enrichment of AOB and the inhibition of NOB were promoted.

Benefits of technology

This method enables rapid start-up of the PN process within 15-20 days, reduces the cost of chemical reagents, provides an efficient and stable PN process start-up method, is non-biotoxic, and shortens the start-up time of traditional methods.

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Abstract

This invention relates to a device and method for rapidly starting a short-cut nitrification process, belonging to the field of water treatment. The invention involves inoculating a secondary sedimentation tank with sludge and adding a polyurethane biological sponge carrier into a sequencing batch reactor (SBR). First, a phased influent influent + incremental post-aeration strategy (increasing aeration time first, then increasing aeration rate) is adopted. This utilizes nitrate and a dynamic oxygen environment to drive the migration of *Candidatus Contendobacter* to the sponge carrier and complete its enrichment and acclimatization, reducing the obstruction of O2 on the endogenous denitrification process of *Candidatus Contendobacter* under aerobic conditions. The phased influent influent is then eliminated, and NH4 is introduced. + -N synthesis wastewater is treated using a low-alkalinity strategy (reducing influent KHCO3 concentration) + post-aeration with an initial increase followed by a decrease in aeration volume, combined with strong NO2 stimulation from Candidatus Contendobacter in a low dissolved oxygen environment. ‑ -N reducing power inhibits NOB growth, enabling rapid start-up of the short-cut nitration process.
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