title: [Identification of a new heterotrophic nitrobacterium strain Colloides sp. JZ1-1 and its nitrifying capability].
abstract: A heterotrophic nitrobacterium strain JZ1-1 with higher nitrifying capability was isolated and mutagenized from an acclimated activated sludge. The JZ1-1 was identified as Colloides sp., according to its morphological and physiological features. The factors affecting the nitrifying capability of JZ1-1 were investigated, including medium carbon source, C/N ratio, pH value, dissolved oxygen, temperature, and ammonium nitrogen concentration. The optimal carbon source was sodium citrate, and the nitrification was favored when the C/N ratio was from 10 to 14, temperature was 30 degrees C, and pH value was 6-9 when cultured at a rotating speed of more than 150 r x min(-1). JZ1-1 could degrade ammonium nitrogen effectively when the initial concentration of ammonium nitrogen was from 100 mg x L(-1) to 500 mg x L(-1). JZ1-1 was stable after 5 generations of subculture.
authors.affiliation: School of Environment and Resource, Zhejiang Agriculture and Forestry University, Lin'an 311300, Zhejiang, China. jbx958@yahoo.com.cn
authors.forename: Ji-Bo
authors.initials: JB
authors.lastname: Xiao
authors.forename: Hui-Xia
authors.initials: HX
authors.lastname: Jiang
authors.forename: Shu-Yi
authors.initials: SY
authors.lastname: Chu
mesh_terms: D041841:Bradyrhizobiaceae / Q000145:classification / Q000302:isolation & purification* / Q000378:metabolism; D003198:Computer Simulation; D058465:Nitrification; D009584:Nitrogen / Q000302:isolation & purification* / Q000378:metabolism; D000644:Quaternary Ammonium Compounds / Q000302:isolation & purification* / Q000378:metabolism; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000737:chemistry
chemical_list: D009584:Nitrogen; D000644:Quaternary Ammonium Compounds; D012722:Sewage; D062065:Wastewater