title: The contrast study of anammox-denitrifying system in two non-woven fixed-bed bioreactors (NFBR) treating different low C/N ratio sewage.
abstract: Two non-woven fixed-bed bioreactors (NFBR) based on different substrates (nitrite and nitrate) were constructed to study the environmental adaptability for temperature and organic matter of anammox-denitrifying system and nitrogen removal performance. The two reactors were successfully operated for 200 days. The average removal rates of nitrogen and COD of R2 were 81% and 93%, respectively. Besides, the nitrogen removal rate of R1 was 95% under not more than 105 mg/l of COD. The experimental results indicated that the R2 based on nitrate had a good nitrogen removal performance at room temperature (25 °C). Additionally, the analysis results of fluorescence in situ hybridization (FISH) showed that the percentage compositions of anammox in R1 and R2 were 84% and 65% on day 189. Finally, the possible nitrogen removal model of anammox-denitrifying system was constructed. According to nitrogen balance and C/N ratios of denitrification, the nitrogen removal approaches of R1 and R2 were obtained.
authors.affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, PR China.
authors.forename: Fan
authors.initials: F
authors.lastname: Gao
authors.forename: Hanmin
authors.initials: H
authors.lastname: Zhang
authors.forename: Fenglin
authors.initials: F
authors.lastname: Yang
authors.forename: Hong
authors.initials: H
authors.lastname: Qiang
authors.forename: Guangyi
authors.initials: G
authors.lastname: Zhang
mesh_terms: D001421:Bacteria, Anaerobic / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology*; D002244:Carbon / Q000737:chemistry*; D009566:Nitrates / Q000302:isolation & purification / Q000378:metabolism*; D009573:Nitrites / Q000302:isolation & purification / Q000378:metabolism*; D009584:Nitrogen / Q000737:chemistry*; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage / Q000382:microbiology*
chemical_list: D009566:Nitrates; D009573:Nitrites; D012722:Sewage; D002244:Carbon; D009584:Nitrogen