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| Factors influencing the competition between activated sludge and biofilm in hybrid MBBR nitrification system |
| ZHOU Jia-zhong1, HAN Wen-jie1, WU Di1, SUN Xiao-yang1, HE Qiang2, KAN Yu-jiao3 |
1. Biofilm Research Institute, Qingdao SPRING Water Treatment CO. Ltd., Qingdao 266510, China;
2. Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China;
3. School of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China |
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Abstract In order to explore the competition relationship between activated sludge and biofilm in hybrid MBBRnitrification system, the influence of conventional factors (sludge concentration, DO, temperature, C/N) on the nitrification effect of hybrid MBBR system was studied through lab-scale experiment. The changing trend of sludge volume load and MBBR (moving bed biofilm reactor) biofilm volume load in the system was analyzed, and the competition relationship of sludge membrane was obtained. The sludge concentration, DO and temperature were positively related to the volume load of hybrid MBBR nitrification system in a certain range. In addition, compared with MBBR biofilm, the activated sludge in the system has an obvious advantage in competing for DO and substrate, while MBBR biofilm had a stronger ability of low temperature resistance. The influent C/N was negatively correlated with the nitrification load of hybrid MBBR system, and the activated sludge had more advantages than MBBR biofilm in response to the high influent C/N, and MBBR "inlay" enhanced the SND effect of the system. The results of microbial analysis showed that Nitrospira was the dominant nitrifying bacteria in hybrid MBBR system, and the enrichment capacity of suspension carrier biofilm was significantly higher than that of activated sludge.
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Received: 14 March 2020
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