化学
自养
氮气
厌氧氨氧化菌
硝化细菌
流出物
生物滤池
制浆造纸工业
环境化学
亚硝酸盐
硝化作用
环境工程
氨
废水
反硝化
硝酸盐
反硝化细菌
细菌
环境科学
生物
有机化学
遗传学
工程类
作者
Yong Liang,Dong Li,Xiaojing Zhang,Huiping Zeng,Jie Zhang
标识
DOI:10.1080/09593330.2014.969327
摘要
Completely autotrophic nitrogen removal over nitrite (CANON) process was considered as one of the most efficient and economical nitrogen removal processes, which was suitable for treating wastewater with low ratio of carbon to nitrogen. In this study, an enlarging start-up strategy for CANON process was proposed, and a 40-L CANON reactor was successfully started by seeding 2-L mature biofilm containing both aerobic ammonia-oxidizing bacteria (AerAOB) and anaerobic ammonia-oxidizing bacteria (AnAOB). The effects of dissolved oxygen (DO), ammonia loading rate and the ratio of air inflow to water inflow (Qair/Qwater) on nitrogen removal performance were investigated. The distribution of AerAOB and AnAOB was analysed using fluorescence in situ hybridization (FISH) technique. The system reached a maximum NRR of 3.11 kg N m−3 d−1 with a removal efficiency of 89.5%, and the average value in steady state was 2.42±0.26 and (83.07 ± 6.89)%, respectively. Analysis of influence factors showed the important role of high DO (around 5 mg L−1), for the high-rate nitrogen removal, and the Qair/Qwater should be controlled at 28–40 for stable operation. FISH results suggested that AerAOB and AnAOB predominated in the reactor, with proportions of 46.8% and 39.3%, respectively. This study demonstrated that the biofilter operated with high effluent DO was a feasible setup for CANON process.
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