title: [Degradation Characteristics of Three Aniline Compounds in Simulated Aerobic Sewage Treat System].
abstract: The removal rates of 4-nitroaniline, 4-isopropyl aniline and 2-chloro-4-nitroaniline under different hydraulic retention time (HRT) were tested by employing a simulation method of aerobic biochemical sewage treatment technology in this study. The results showed that when HRT was 6 h, 12 h, and 24 h, the removal rates of dissolved organic carbon (DOC) were 70.2%, 80.3% and 88.3%, the removal rates of 4-nitroaniline were 48%, 64.7% and 75%; and the removal rates of 4-isopropyl aniline were 66%, 76% and 91%, respectively. It was concluded that increasing HRT could promote the removal rates of DOC and aniline chemicals. In contrast, 2-chloro-4-nitroaniline was difficult to be removed. The removal rates were less than 20% under all tested conditions. The kinetics analysis showed that the biodegradation of 4-nitroaniline, 4-isopropyl aniline and 2-chloro-4-nitroaniline in aerobic activated sewage (3 g x L(-1)) accorded with the first order kinetics and the regression coefficients were > 0.95. The half-life time of biodegradation was 6.01 h, 16.16 h, 123.75 h, respectively. In general, functional groups such as isopropyl had a positive effect on the biodegradation of aniline chemicals, whereas substituents such as nitro group and chlorine atom had an inhibitory effect.
authors.forename: Wen
authors.initials: W
authors.lastname: Gu
authors.forename: Lin-jun
authors.initials: LJ
authors.lastname: Zhou
authors.forename: Ji-ning
authors.initials: JN
authors.lastname: Liu
authors.forename: Guo-song
authors.initials: GS
authors.lastname: Chen
authors.forename: Li-li
authors.initials: LL
authors.lastname: Shi
authors.forename: Yan-hua
authors.initials: YH
authors.lastname: Xu
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D001673:Biodegradation, Environmental; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid
chemical_list: D000814:Aniline Compounds; D012722:Sewage; C071396:2-chloro-4-nitroaniline; C019498:4-nitroaniline; C023650:aniline