title: [Treatment of micro-polluted river water by immobilized microorganism technique].
abstract: The effect of immobilized microorganism technique on the micro-polluted river water was studied by four kinds of gaia-biological aerated filter (G-BAF), which were formed by special microorganism (BP35) and four different carriers, including haydite, FPUFS, aquamats flexible carrier and artificial aquatic mat. The removal rates of NH4(+) -N, chlorophyll and turbidity were 83.0%-89.0%, 77.5%-89.0% and 84.4%-95.2%, respectively, and they were all higher than the removal rates of COD, UV254 and TP. The FPUFS contained reactive groups, such as hydroxyl, epoxy and acylamide groups, which made FPUFS load a great amount of enzymes and microorganisms. Therefore, the removal rates of pollutants for FPUFS-G-BAF were higher than those for the other three kinds of G-BAF. Hydraulic retention time (HRT) had little effect on the removal rate of NH4(+) -N, while affected the removal rate of COD significantly. When the concentration of dissolved oxygen (DO) increased from < 2 mg/L to > 4 mg/L, for the four kinds of G-BAF, the removal rates of COD and NH4(+) -N increased 11.9%-18.0% and 12.7%-16.1%, respectively. The result of GC-MS showed that the technique of G-BAF could effectively degrade the macro-molecule refractory organics into small-molecule substance.
authors.affiliation: Department of Environmental Engineering, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing 100871, China. quyanzhi@iee.pku.edu.cn
authors.forename: Yan-Zhi
authors.initials: YZ
authors.lastname: Qu
authors.forename: Cao
authors.initials: C
authors.lastname: Liu
authors.forename: Ri-Hong
authors.initials: RH
authors.lastname: Liao
authors.forename: Lei
authors.initials: L
authors.lastname: Yao
authors.forename: Zheng-Fang
authors.initials: ZF
authors.lastname: Ye
authors.forename: Pei-Jing
authors.initials: PJ
authors.lastname: Wang
mesh_terms: D001419:Bacteria / Q000166:cytology / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D018914:Cells, Immobilized; D005374:Filtration / Q000379:methods; D009930:Organic Chemicals / Q000378:metabolism; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D009930:Organic Chemicals; D014874:Water Pollutants, Chemical