Sludge enrichment and intermittent gradient aeration: Modulating microbial communities for start-up of partial nitrification in a sequencing batch reactor (SBR).

Autor: Hou Y; College of Environment and Ecology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China., Zhao R; College of Environment and Ecology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China., Ma J; College of Environment and Ecology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China., Jia K; College of Environment and Ecology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China., Abudula A; Energy Conversion Engineering Laboratory Institute of Regional Innovation (IRI), Hirosaki University, 3-Bunkyocho, Hirosaki 036-8561, Japan., Guan G; Energy Conversion Engineering Laboratory Institute of Regional Innovation (IRI), Hirosaki University, 3-Bunkyocho, Hirosaki 036-8561, Japan., Duan Y; College of Environment and Ecology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China. Electronic address: duanyun@tyut.edu.cn.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2024 Nov 30; Vol. 418, pp. 131916. Date of Electronic Publication: 2024 Nov 30.
DOI: 10.1016/j.biortech.2024.131916
Abstrakt: A novel approach has been proposed integrating sludge enrichment with intermittent gradient aeration to achieve partial nitrification (PN). Results indicated that this method suppressed nitrite-oxidizing bacteria (NOB) activity while maintained ammonia-oxidizing bacteria (AOB) activity, achieving an 82.87 % nitrite accumulation rate (NAR) during startup. During stable operation, specific ammonia oxidation rate and specific nitrite oxidation rate reached 18.44 and 2.67 mg N/g MLVSS/h, respectively. Shortening anoxic time from 30 to 20 min enhanced ammonia removal efficiency by 12.5 %, increasing NAR to 89.55 %. Further reduction to 5 min yielded 38.46 % and 91.88 %, respectively. AOB abundance enriched from 0.62 % to 22.28 %, with the AOB-to-NOB ratio jumping from 0.22 to 59.58. This research presented a rapid and effective strategy for achieving PN.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: