MBBR-nitrification process performance and N2O emission characteristics with continuous/intermittent aeration regimes
ZHANG Zhe1, ZHANG Yao1, LIU Qing-hua1, LIU Chao2, WANG Ya-yi1
1. State Key Laboratory of Pollution Control and Resources Reuse, Shanghai institute of pollution control and ecological security, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
2. Shanghai Environmental Sanitary Engeering Design Institute, Shanghai 200092, China
In this study, a moving-bed Biofilm reactor (MBBR) was used to immobilize ammonia-oxidizing bacteria (AOB) on carriers. Two MBBR-AOB reactors were operated under continuous aeration (RC) and intermittent aeration (RI) in parallel. The variationsin the nitritation performance and nitrous oxide and nitric oxide emission characteristics were analyzed under different aeration regimes. The results showed that both aeration methods can achieve partial nitrification, but the average effluent concentration of NO2--N was approximately 20% higher in the RI than that in the RC; also, the degree of fluctuation of effluent NO2--N and NO3--Nwere smaller in the RI than that in the RC. Therefore, intermittent aeration mode had better nitritation performance, and it was easier to achieve a stable nitritation system. Online measurement of gaseous N2O and NO showed that RC reduced the release of NO by about 87.3% and increased the release of N2O by about 57.5%. The 16S rDNA high-throughput sequencing revealed that Nitrosomonas was the main AOB genus, and its highest relative abundance in the RC and RI modes was 8% and 10.06% respectively,and the lowest was 2.19% and 2.26% respectively. Our findings suggest running MBBR nitritation reactor with intermittent aeration mode couldachievea higher AOB relative abundance.
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