title: [Application of Micro-aerobic Hydrolysis Acidification in the Pretreatment of Petrochemical Wastewater].
abstract: Micro-aerobic hydrolysis acidification technology was applied in the reconstruction of ananaerobic hydrolysis acidification tank in a north petrochemical wastewater treatment plant. After put into operation, the monitoring results showed that the average removal rate of COD was 11.7% when influent COD was 490.3-673.2 mg x L(-1), hydraulic retention time (HRT) was 24 and the dissolved oxygen (DO) was 0.2-0.35 mg x L(-1). In addition, the BOD5/COD value was increased by 12.4%, the UV254 removal rate reached 11.2%, and the VFA concentration was increased by 23.0%. The relative molecular weight distribution (MWD) results showed that the small molecule organic matter (< 1 x 10(3)) percentage was increased from 59.5% to 82.1% and the high molecular organic matter ( > 100 x 10(3)) percentage was decreased from 31.8% to 14.0% after micro-aerobic hydrolysis acidification. The aerobic biodegradation batch test showed that the degradation of petrochemical wastewater was significantly improved by the pretreatment of micro-aerobic hydrolysis acidification. The COD of influent can be degraded to 102.2 mg x L(-1) by 48h aerobic treatment while the micro-aerobic hydrolysis acidification effluent COD can be degraded to 71.5 mg x L(-1) on the same condition. The effluent sulfate concentration of micro-aerobic hydrolysis acidification tank [(930.7 ± 60.1) mg x L(-1)] was higher than that of the influent [(854.3 ± 41.5) mg x L(-1)], indicating that sulfate reducing bacteria (SRB) was inhibited. The toxic and malodorous gases generation was reduced with the improvement of environment.
authors: Chen
authors: C
authors: Zhu
authors: Chang-yong
authors: CY
authors: Wu
authors: Yue-xi
authors: YX
authors: Zhou
authors: Xiao-yong
authors: XY
authors: Fu
authors: Xue-min
authors: XM
authors: Chen
authors: Yan-bo
authors: YB
authors: Qiu
authors: Xiao-feng
authors: XF
authors: Wu
mesh_terms: D001673:Biodegradation, Environmental; D006868:Hydrolysis; D010100:Oxygen / Q000032:analysis; D013431:Sulfates / Q000032:analysis; D016999:Sulfur-Reducing Bacteria; D064091:Waste Disposal Facilities; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014871:Water Microbiology
chemical_list: D010100:Oxygen; D013431:Sulfates; D062065:Wastewater