期刊
BIOPROCESS AND BIOSYSTEMS ENGINEERING
卷 42, 期 9, 页码 1507-1515出版社
SPRINGER
DOI: 10.1007/s00449-019-02148-z
关键词
Advanced nitrogen removal; Post-denitrification; Wastewater treatment; Sequencing batch reactor (SBR); Real-time control
资金
- National Natural Science Foundation of China [21677005]
- 111 Project [D16003]
- Beijing Municipal Commission of Education
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. The A/O/A SBR has good potential in achieving advanced nitrogen removal, especially in nitrogen-sensitive rural areas.
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