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| Effects of organic matter on nitrogen removal and microbial community in anammox reactor |
| CHEN Chong-jun1,2,3,4, WANG Yao-qi1, JIANG Ying1, GUO Meng-lei1, XIE Jia-wei1, XIE Jun-xiang1, SHEN Yao-liang1,2,3 |
1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
2. Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou 215009, China;
3. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215009, China;
4. Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China |
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Abstract The UASB continuous flow reactor was used to study the long-term effects of different organic concentrations on the anammox nitrogen removal and microbial community structure. The results showed that the 40mg/L of COD concentration provided the most promotion to anammox reaction among the COD concentration levels with 0, 20, 40, 60 and 80mg/L. At this concentration, the TN and COD removal rates were stabilized at 88.5% and 75.3%, respectively. Under a lower level (20mg/L), the anammox reaction was not affected significantly. However, the nitrogen removal performance was inhibited when the COD concentrations were higher at 60 and 80mg/L. The microbial community structure under different COD concentrations was analyzed by high-throughput sequencing technology. The results indicated that the Chloroflexi, Planctomycetes, Proteobacteria and Actinobacteria were always dominated under different COD concentrations, their relative abundance varied in different scenarios. The relative abundance of Planctomycetes was decreased from 24.60% to 7.70% with the increase of COD concentration (0 to 80mg/L). Among them, Candidatus Brocadia declined fastest, and the abundance was decreased from 12.14% to 3.63%. The relative abundance of Proteobacteria was increased from 15.40% to 36.30%, among which Bdelloribrio had the biggest increase from 0.01% to 8.39%.
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Received: 16 May 2019
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