Insights into rapidly recovering the autotrophic nitrogen removal performance of single-stage partial nitritation-anammox systems: Reconstructing granular sludge and its functional microbes synergy. (October 2022)

• Record Type: Journal Article
• Authors: Yang, Enzhe; Chen, Jing; Jiang, Ziyi; Deng, Zhengyu; Tu, Zhi; Wang, Hong; Wu, Sha; Kong, Zhe; Hendrik Sanjaya, Eli; Chen, Hong
• Is Part Of: Bioresource technology. Volume 361(2022)
• Publication Date: 2022-10
• Subjects: Wastewater treatment -- Biological nitrogen removal -- Partial nitritation-anammox -- Granular sludge -- Functional microbes; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.127750
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: The deteriorated AIPBR was successfully recovered with an TNRE of 71.93%. Flexible use of FNA and FA to inhibit NOB and reduce the toxic effects of FNA. AR regulation and DO partitioning are critical for PNA systems to recover. Recovery was by reconstructing granular sludge and functional microbes synergy. Abstract: Partial nitritation-anammox (PNA) deteriorates easily and is difficult to recover. After an airlift inner-circulation partition bioreactor was impacted by low NH4 + –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.