Treatment of domestic wastewater by low DO nitrification coupled with endogenous denitrification system
LI Fang-zhou, ZHANG Qiong, PENG Yong-zhen
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
To further utilize carbon source and reduce aeration energy consumption, endogenous denitrification reactor (ED-SBR) coupled with the low DO nitrification reactor (LDON-SBR) were used to treat low C/N domestic wastewater without additional carbon sources. The operation mode was: anaerobic (ED-SBR)-aerobic (LDON-SBR)-anoxic (ED-SBR). The feasibility of endogenous denitrification coupled with the low DO nitrification was evaluated according to the performance of ED-SBR/ LDON-SBR system. The results showed that low DO concentration (0.3~0.5mg/L) maintained a stable nitrification performance in the LDON-SBR, and the nitrifying efficiency reached up to 90%. Meanwhile low DO concentration enhanced simultaneous nitrification and denitrification (SND), and the average SND rate was 29.6% in the LDON-SBR; In the ED-SBR, the organic matter of influent was stored as internal carbon source in the anaerobic period. The stored internal carbon source could be used for endogenous denitrification in the next anoxic period, which reduced NO3--N concentration from 27.3mg/L to 3.9mg/L in the ED-SBR with a NO3--N removal rate of 86.5%; In addition, the COD removal rate was about 80% in the low DO nitrification coupled with endogenous denitrification system.
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