Nitrate removal by anaerobic ferrous-oxidizing (NAFO) process: performance and characteristics of cultivated sludge
The nitrate-dependent anaerobic ferrous oxidizing(NAFO)is a newly discovered autotrophic bioprocess,which was valuable to develop autotrophic denitrifying technology.In this work,the performance of NAFO process and characteristics of the active sludge was investigated.The NAFO process was operated in the lab-scale reactor over 200 days.The whole operation period could be divided into three separate phases.Under the steady state(phase III),a nitrate removal rate(NRR)of 115.01±7.69 g·m-3·d-1 was achieved.A comparison between the seeding sludge and cultivated sludge was carried out to illustrate the NAFO sludge characteristics.The results showed that the NAFO sludge possessed distinct high settleability,and the average velocity value was 390.07±161.31 m/h.The increasing of particle size and density was contributed to the excellent profile.The NAFO sludge contained high quantity of iron oxide compounds,which endowed unique morphology characteristics of the NAFO sludge.After a long-term operation,a microbial succession was supposed to occur in the granular sludge,and the dominant bacterial communities in the NAFO sludge were Proteobacteria,Actinobacteria,Firmicutes and Chloroflexi.
autotrophic denitrification NAFO performance physicochemical characteristics microbial community
Meng Zhang Ping Zheng Zhuo Zeng Xiaoyu Shan Ghulam Abbas
Department of Environmental Engineering,Zhejiang University,Hangzhou 310058,China
国内会议
上海
英文
1-20
2015-11-06（万方平台首次上网日期，不代表论文的发表时间）