作者
Liangliang Shi, Bin Ma, Xiyao Li, Qiong Zhang, Yongzhen Peng
发表日期
2019/9/13
期刊
Bioprocess and biosystems engineering
卷号
42
页码范围
1507-1515
出版商
Springer Berlin Heidelberg
简介
Advanced nitrogen removal without the addition of external carbon source is challenging in the conventional biological nitrogen removal processes. This study presented a novel anaerobic/aerobic/anoxic sequencing batch reactor (A/O/A SBR) based on endogenous nitrate (NO3−–N) respiration to enhance nitrogen removal. The mean effluent total nitrogen (TN) in the A/O/A SBR could be reduced to as low as 3.5 mg/L, when the average influent TN and chemical oxygen demand (COD) were 52.7 and 235.4 mg/L, respectively. This advanced nitrogen removal was attributed to the post-denitrification, since 82.7% of TN removal was achieved in the post-anoxic stage. The post-denitrification rate with nitrite (NO2−–N, 0.59 mg NO2−–N/gMLVSS/h) was higher than that with NO3−–N (0.35 mg NO3−–N/gMLVSS/h). Therefore, the post-anoxic time could be further optimized by achieving denitrification via NO2−–N …
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L Shi, B Ma, X Li, Q Zhang, Y Peng - Bioprocess and biosystems engineering, 2019