Insights into the synergy between functional microbes and dissolved oxygen partition in the single-stage partial nitritation-anammox granules system.

Autor: Wang H; School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410004, PR China., Yang M; Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, PR China., Liu K; School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410004, PR China., Yang E; School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410004, PR China., Chen J; School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410004, PR China., Wu S; School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410004, PR China., Xie M; School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410004, PR China., Wang D; College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China., Deng H; Meidensha Corporation, Tokyo 141-6029, Japan., Chen H; School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410004, PR China. Electronic address: chenhonghnu@gmail.com.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2022 Mar; Vol. 347, pp. 126364. Date of Electronic Publication: 2021 Nov 25.
DOI: 10.1016/j.biortech.2021.126364
Abstrakt: The rapid start-up and stable operation of the single-stage partial nitritation-anammox (PNA) process remains a challenge in practical applications. An integrated investigation of nitrogen removal performance, sludge characteristics, activity and abundance, and microbial dynamics was implemented for 360 days via an airlift internal circulation reactor. During long-term operation, the reactor realized a stable dissolved oxygen (DO) partition and cultivated granular sludge. The nitrogen removal rate increased from 0.15 kg-N/m 3 /d to 1.24 kg-N/m 3 /d, and a high nitrogen removal efficiency of 82.6% was obtained. A stable DO partition further accelerated the bioreaction rates and enhanced the activity of functional microbes. The activities of ammonia oxidation and anammox reached 1.21 g-N/g-VSS/d and 1.43 g-N/g-VSS/d, respectively. Sludge granulation efficiently enriched the abundances of Candidatus Brocadia (7.4%) and Nitrosomonas (5.2%). These results demonstrated that efficient DO partition and stable culture of granular sludge could enhance the synergy of functional microbes for autotrophic nitrogen removal.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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