Minimization of nitrous oxide emission from CASS process treating low carbon source domestic wastewater: Effect of feeding strategy and aeration rate

被引：43
作者：
Liang, Weihao [1 ]
Yu, Chao [1 ]
Ren, Hongqiang [1 ]
Geng, Jinju [1 ]
Ding, Lili [1 ]
Xu, Ke [1 ]
机构：
[1] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Jiangsu, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2015年 / 198卷
关键词：
Nitrous oxide; Feeding strategy; Aeration rate; Cyclic Activated Sludge System; Microbial community; SEQUENCING BATCH REACTOR; ACTIVATED-SLUDGE; N2O PRODUCTION; NITRIC-OXIDE; MICROBIAL COMMUNITY; OXIDIZING BACTERIA; DENITRIFICATION; NITRIFICATION; NITRITATION; GENERATION;
D O I：
10.1016/j.biortech.2015.08.075
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
Nitrous oxide (N2O) emission during wastewater treatment can be mitigated by improving operational conditions, e. g., organic carbon supply and dissolved oxygen. To evaluate the control parameters for N2O emission in the low carbon source domestic wastewater treatment process, N2O emissions from Cyclic Activated Sludge System (CASS) under different feeding strategies and aeration rates were investigated. Results showed that continuous feeding enhanced nitrogen removal and reduced N2O emission compared to batch feeding, while a higher aeration rate led to less N2O emission. N2O was mainly produced during non-aeration phases in batch feeding CASS and the amount of N2O generated from denitrification decreased under continuous feeding, indicating that carbon source in the continuous influent relieved the electron competition between denitrification reductases during non-aeration phase. Moreover, taxonomic analysis based on high-throughput 16S rRNA gene sequencing revealed higher abundance of denitrifying bacteria, especially N2O-reducing bacteria in continuous feeding CASS. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：172 / 180
页数：9
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