Study on the advanced nitrogen removal under low temperature by biofilm on weak magnetic carriers

被引：15
作者：
Chen, Sien [1 ]
Yang, Dongli [1 ]
Wang, Qingxin [1 ]
Huang, Xueying [2 ]
Ren, Hongqiang [1 ]
Xu, Ke [1 ]
机构：
[1] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Peoples R China
[2] Nanjing Univ, Sch Geog & Oceanog Sci, Nanjing 210023, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2022年 / 360卷
关键词：
Weak magnetic carrier; Advanced nitrogen removal; Low temperature; Enzyme activity; Electron transport chain; Microbial community; WASTE-WATER; MICROBIAL COMMUNITY; DENITRIFICATION; FIELD; WETLANDS; SYSTEM; CELL;
D O I：
10.1016/j.biortech.2022.127580
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
The advanced nitrogen removal under low temperature is inhibited because of reduction of the microbial activity. Packed bed reactors filled with different magnetic carriers (0, 0.3, 0.6, 0.9 mT) were constructed to enhance advanced denitrification under low temperature (5 degrees C). Results showed that 0.3 and 0.9 mT carriers significantly improved denitrification, indicating the "window" effect. Total nitrogen removals were increased by 6.96% and 8.25%, and NO2- accumulation decreased by 25.70% and 13.90% in 0.3 and 0.9 mT reactors, respectively. Analysis of enzyme activity and electron transport chain showed that 0.3 mT carrier mainly increased NIR activity by improving compound III and cytC abundance while 0.9 mT carrier mainly increased NAR activity by improving compound I and NADH abundance, indicating different pathways. Similar microbial community in 0.3 and 0.9 mT reactors were revealed. Overall, weak magnetic carriers can be used to enhance advanced nitrogen removal under low temperature.
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页数：10
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