title: Improving hydrolysis acidification by limited aeration in the pretreatment of petrochemical wastewater.
abstract: Petrochemical wastewater was pretreated by hydrolysis acidification to improve the biodegradation and treatability on limited aeration conditions. The results showed limited aeration with DO from 0.2 to 0.3mg/L (average ORP was -210 mV) was the best condition. The BOD5/COD of influent was 0.23, and it increased to 0.43 on this condition. Limited aeration can obviously reduce the reduction of SO4(2-), reducing the generation of toxic gas H2S, and almost no H2S can be detected in the off-gas. The sulfate reducing bacteria (SRB) diversity and abundance on limited aeration condition was obviously inhibited. Limited aeration condition was benefit for the removal of benzene ring organics, such as benzene, toluene, ethylbenzene and xylenes (BTEX), improving the toxicity and treatability of the wastewater. Based on the experiment results, an anaerobic hydrolysis acidification tank (100,000 m(3)) has been transformed into limited aeration hydrolysis acidification tank and it runs well.
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Research Center of Water Pollution Control Technology, Chinese Research Academy of Environment Sciences, Beijing 100012, China.
authors.forename: Changyong
authors.initials: C
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Research Center of Water Pollution Control Technology, Chinese Research Academy of Environment Sciences, Beijing 100012, China. Electronic address: zhouyuexi@263.net.
authors.forename: Yuexi
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: School of Marine Science and Technology and Environment, Dalian Ocean University, Dalian, Liaoning 116032, China.
authors.forename: Peichao
authors.initials: P
authors.lastname: Wang
authors.affiliation: Jilin Petrochemical Wastewater Treatment Plant, PetroChina Jilin Petrochemical Company, Jilin 132000, China.
authors.forename: Shujun
authors.initials: S
authors.lastname: Guo
mesh_terms: D000143:Acids / Q000737:chemistry*; D000332:Aerobiosis; D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000032:analysis; D006868:Hydrolysis; D010578:Petroleum / Q000032:analysis*; D013431:Sulfates / Q000032:analysis; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D000143:Acids; D005232:Fatty Acids, Volatile; D010578:Petroleum; D013431:Sulfates; D062065:Wastewater
keywords: Biodegradability; DO; Hydrolysis acidification; Limited aeration; Petrochemical wastewater