title: [Study on treatment of coking wastewater by A/O process of biological filter].
abstract: Coking wastewater was treated by A/O process of biological filter with a special kind of carrier. The wastewater contained much more phenolic compounds with about 2000 mg/L of COD and 260 mg/L of NH4+ -N. The A/O system could achieve average removal efficiencies of 87.0% and 91.6% for COD and NH4+ -N, respectively, when HRT was 60 h. The NH4+ -N in the effluent could meet the first level of National Discharge Standard at optimal operation condition. The phenolic compounds with low molecular weight could be fully biodegraded by A/O system. The organic compounds in the effluent were in the relative molecular weight range of 10,000-30,000 and contained --OH, C==O, C--O and phenyl group. Based on the support and protection of the carrier, a great number of microorganisms adhered and immobilized on the outer and inner surface of carrier, which contributed to a simultaneous removal of COD, NH4+ -N and TN. The A/O system biological filter showed a characteristic of steady performance and resistance ability during the operation period.
authors.affiliation: The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Department of Environmental Engineering, Peking University, Beijing 100871, China. laipeng@iee.pku.edu.cn
authors.forename: Peng
authors.initials: P
authors.lastname: Lai
authors.forename: Hua-zhang
authors.initials: HZ
authors.lastname: Zhao
authors.forename: Zheng-fang
authors.initials: ZF
authors.lastname: Ye
authors.forename: Jin-ren
authors.initials: JR
authors.lastname: Ni
authors.forename: Ming
authors.initials: M
authors.lastname: Zeng
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002244:Carbon / Q000302:isolation & purification / Q000378:metabolism; D002681:China; D003077:Coke; D005374:Filtration / Q000379:methods; D007220:Industrial Waste / Q000032:analysis / Q000517:prevention & control*; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism; D010100:Oxygen / Q000737:chemistry; D019800:Phenol / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000379:methods*; D014873:Water Pollutants / Q000302:isolation & purification / Q000378:metabolism; D014876:Water Pollution / Q000032:analysis / Q000517:prevention & control
chemical_list: D003077:Coke; D007220:Industrial Waste; D014873:Water Pollutants; D019800:Phenol; D002244:Carbon; D009584:Nitrogen; D010100:Oxygen