title: Organics and nitrogen removal from textile auxiliaries wastewater with A2O-MBR in a pilot-scale.
abstract: The removal of organic compounds and nitrogen in an anaerobic-anoxic-aerobic membrane bioreactor process (A(2)O-MBR) for treatment of textile auxiliaries (TA) wastewater was investigated. The results show that the average effluent concentrations of chemical oxygen demand (COD), ammonium nitrogen (NH4(+)-N) and total nitrogen (TN) were about 119, 3 and 48 mg/L under an internal recycle ratio of 1.5. The average removal efficiency of COD, NH4(+)-N and TN were 87%, 96% and 55%, respectively. Gas chromatograph-mass spectrometer analysis indicated that, although as much as 121 different types of organic compounds were present in the TA wastewater, only 20 kinds of refractory organic compounds were found in the MBR effluent, which could be used as indicators of effluents from this kind of industrial wastewater. Scanning electron microscopy analysis revealed that bacterial foulants were significant contributors to membrane fouling. An examination of foulants components by wavelength dispersive X-ray fluorescence showed that the combination of organic foulants and inorganic compounds enhanced the formation of gel layer and thus caused membrane fouling. The results will provide valuable information for optimizing the design and operation of wastewater treatment system in the textile industry.
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, China.
authors.forename: Faqian
authors.initials: F
authors.lastname: Sun
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, China; Shanghai Electric Group Co. Ltd. Central Academe, Shanghai 200070, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Sun
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Hu
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, China.
authors.forename: Yangyang
authors.initials: Y
authors.lastname: He
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, China. Electronic address: weixiang@zju.edu.cn.
authors.forename: Weixiang
authors.initials: W
authors.lastname: Wu
mesh_terms: D001419:Bacteria / Q000378:metabolism; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D007220:Industrial Waste; D008567:Membranes, Artificial; D009584:Nitrogen / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D010084:Oxidation-Reduction; D010865:Pilot Projects; D011145:Polyvinyls; D013784:Textiles; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D005465:Fluorocarbon Polymers
chemical_list: D007220:Industrial Waste; D008567:Membranes, Artificial; D009584:Nitrogen; D009930:Organic Chemicals; D011145:Polyvinyls; D062065:Wastewater; D014874:Water Pollutants, Chemical; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers
keywords: Anaerobic–anoxic–aerobic; Membrane bioreactor; Recycle ratio; Refractory organics; Textile auxiliaries wastewater