Responses of various carbon to nitrogen ratios to microbial communities, kinetics, and nitrogen metabolic pathways in aerobic granular sludge reactor

被引:22
作者
Zou, Xin [1 ]
Gao, Mengjiao [1 ]
Mohammed, Abdul [1 ]
Liu, Yang [1 ,2 ,3 ]
机构
[1] Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 1H9, Canada
[2] Queensland Univ Technol, Sch Civil & Environm Engn, Brisbane, QLD, Australia
[3] Univ Alberta, Donadeo Innovat Ctr Engn, Dept Civil & Environm Engn, 7 263, Edmonton, AB T6G 1H9, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Free ammonia inhibition; Heterotrophic ammonia oxidizing bacteria; Autotrophic ammonia oxidizing bacteria; Specific microbial activity; Heterotrophic nitrification aerobic; denitrification (HNAD); WASTE-WATER; PHOSPHORUS REMOVAL; FREE AMMONIA; DENITRIFICATION; NITRIFICATION; BACTERIA; OPTIMIZATION; STABILITY; DYNAMICS; IMPACT;
D O I
10.1016/j.biortech.2022.128225
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
The role of different ammonia concentrations (mg N/L) (of 100 (carbon to nitrogen ratio (C/N) = 12; Stage I), 200 (C/N = 6; Stage II), 400 (C/N = 3; Stage III) and 200 (C/N = 6; Stage IV)) in nitrogen metabolic pathways, microbial community, and specific microbial activity were investigated in an aerobic granular sludge reactor. Heterotrophic ammonia oxidizing bacteria (HAOB) showed higher ammonia oxidation rates (AORs) than autotrophic ammonia oxidizing bacteria (AAOB) at higher C/N conditions (Stages I and II). Paracoccus was the dominant HAOB. AAOB, with only 0.2-0.3 % in relative abundance, showed 2.7-fold higher AORs than HAOB at elevated ammonia and free ammonia (FA) concentrations with C/N at 3. Nitrosomonas and a genus in Nitrosomondaceae family were the major AAOB. This study proposed that FA inhibition on heterotrophic bacteria might be the mechanism that contributes to the development of the autotrophic ammonia oxidation pathway and enrichment of AAOB.
引用
收藏
页数:10
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