AI Article Synopsis
- Partial nitritation-anammox (PNA) processes can break down easily when faced with bad wastewater conditions, causing a big drop in nitrogen removal efficiency.
- Researchers tested a special recovery method for PNA systems that helped improve nitrogen removal from only 5.97% back to 61.77% in just 43 days.
- The recovery was supported by changes in the types of bacteria present, with a shift from one type (Nitrospira) to another (Candidatus Brocadia), which worked together better to remove nitrogen efficiently.
Article Abstract
Partial nitritation-anammox (PNA) deteriorates easily and is difficult to recover. After an airlift inner-circulation partition bioreactor was impacted by low NH-N wastewater containing organic matter, Nitrospira and Denitratisoma propagated rapidly, granular sludge disintegrated, and the total nitrogen removal efficiency (TNRE) decreased from 68.27 % to 5.97 %. This study used a unique strategy to recover deteriorated single-stage PNA systems and explored the mechanism of rapid performance recovery. The TNRE of the system recovered up to 61.77 % in 43 days. The high nitrogen loading rate and hydraulic shear force from the airlift caused the sludge in the reactor to granulate again. The microbial community structure recovered, with a decrease in the abundance of Nitrospira (0.05 %) and enrichment of Candidatus Brocadia (8.82 %). A favorable synergy among functional microbes in the reactor was thus re-established, promoting the rapid recovery of the nitrogen removal performance. This study provides a feasible recovery strategy for PNA processes.
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| http://dx.doi.org/10.1016/j.biortech.2022.127750 | DOI Listing |
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