Effect of the ratios of sodium acetate to sodium propionate on denitrifying phosphorus removal characteristics in the A2/O-BCO process
YU Meng1, PAN Ting1, ZHANG Miao1, WANG Yi-xin1, PANG Jing-jin2, JIANG You-fa3, WANG Bao-lin3, HE Cheng-da1
1. College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China;
2. Yangzhou Jieyuan Drainage Company Limited, Yangzhou 225002, China;
3. Jiangsu Yangnong Chemical Company Limited, Yangzhou 225009, China
A denitrifying phosphorus removal system combining anaerobic/anoxic/oxic (A2/O) with biological contact oxidation process (BCO) was used to treat synthetic wastewater. By adjusting the ratio of sodium acetate to sodium propionate (sodium acetate:sodium propionate=1:0,2:1,1:1,1:2 and 0:1), the organic matter removal and denitrifying phosphorus removal characteristics of the system were investigated. The results showed that the ratio of sodium acetate to sodium propionate revealed a negligible effect on organic matter and NH4+-N removals, but the influences on organic consumption in the anaerobic stage, total nitrogen removal as well as the phosphorus release and absorption were obvious. The operation parameters of the system need to be further optimized due to the low phosphorus removal of 50.3%~56.8%. When the sodium acetate/sodium propionate was 1:1, the organic matter consumption in the anaerobic section was the highest, accounting for 61.2% of the total organic matter input, with the maximum anaerobic phosphorus releaseamount(23.2mg/L) and anoxic phosphorus uptake rate (71.4%). However, the TN removal increased with the addition of sodium propionate. High-throughput sequencing results showed that the microbial diversity in the A2/O reactor was lower, while the mixed carbon source sludge was more abundant than that of the single carbon source. Particularly, the amount of Chloroflexi and Saccharibacteria reduced while the Proteobacteria and Bacteroidetes increased in the domesticated sludge. The total proportion of nitrifying bacteria in the BCO reactor was 2.1%~31.4%, and the ammonia oxidizing bacteria (AOB) was dominate which favoured the realization of short-cut nitrification.
於蒙, 潘婷, 张淼, 王一鑫, 庞晶津, 姜友法, 王宝林, 何成达. 乙酸钠丙酸钠配比对A2/O-BCO反硝化除磷及菌群结构的影响[J]. 中国环境科学, 2019, 39(10): 4178-4185.
YU Meng, PAN Ting, ZHANG Miao, WANG Yi-xin, PANG Jing-jin, JIANG You-fa, WANG Bao-lin, HE Cheng-da. Effect of the ratios of sodium acetate to sodium propionate on denitrifying phosphorus removal characteristics in the A2/O-BCO process. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(10): 4178-4185.
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