Nitrate removal by anaerobic ferrous-oxidizing (NAFO) process: performance and characteristics of cu

• 作 者: MengZhang;PingZheng;ZhuoZeng;XiaoyuShan;GhulamAbbas;
• 机 构: Department of Environmental Engineering,Zhejiang University,Hangzhou 310058,China
• 出 处: 中国生物工程学会第六次全国会员代表大会暨第九届学术年会
• 发表日期: 2015年期

　　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.