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| Optimization for low C/N sewage treatment in an anaerobic/aerobic simultaneous nitrification-endogenous denitrification and phosphorous removal system |
| WANG Xiao-xia1,2, WANG Shu-ying1, ZHAO Ji1, DAI Xian1, PENG Yong-zhen1 |
1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;
2. Department of Environmental Engineering, Qingdao University, Qingdao 266071, China |
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Abstract This study focused on the nitrogen (N) and phosphorus (P) removal performance optimization in simultaneous nitrification-endogenous denitrification and phosphorus removal (SNEDPR) systems. An anaerobic (180min)/aerobic sequencing batch reactor (SBR) fed with domestic wastewater was studied for optimization of N and P removal performance of SNEDPR by regulating the aerobic dissolved oxygen (DO) concentration (0.3~1.0mg/L) and aerobic duration time (150~240min). FISH technology was also employed to analyze the population dynamics of functional microorganisms in the SNEDPR system. Results indicated that the effluent PO43--P concentration was below 0.4mg/L, effluent TN concentration decreased from 14.3mg/L to 8.7mg/L, and TN removal efficiency increased from 75% to 84% with aerobic DO concentration decreased from 1.0mg/L to 0.3mg/L and aerobic duration time increased from 150min to 240min. SNED was enhanced by the decreased aerobic DO concentration, with SNED efficiency increased from 34.7% to 63.8%. The enhanced SNED reduced the effluent NO3--N concentration, improved the N removal performance, and strengthened the intracellular carbon storage at the following anaerobic stage. FISH results showed that the populations of PAOs, GAO and AOB (ammonia oxidizing bacteria) still maintained at high levels in the 127-day optimized SNEDPR-SBR (accounting for 29%±3%, 20%±3% and 13%±3% of total biomass, respectively), which ensured the P uptake, nitrification and denitrification; however, NOB (nitrite oxidizing bacteria) reduced by 50%, which provided a possibility to achieve N removal through simultaneous partial nitrification-endogenous denitrification in the SNEDPR.
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Received: 18 January 2016
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