title: Enhanced azo dye wastewater treatment in a two-stage anaerobic system with Fe0 dosing.
abstract: Azo dye wastewater treatment was enhanced in an acidogenic reactor (A1) by Fe(0) dosing. Both COD (50%) and color (60%) removal in A1 were stable when the dye concentrations were increased from 200 to 800 mg/L. However, the performances of a Fe(0)-free control reactor (A2) showed low COD (34%) and color (32%) removals. The reason was attributed that Fe(0) dosing enhanced the activity of fermentative bacteria, which played an important role in acidogenesis and decolorization. The methanogenic reactor fed with the effluent of A1 exhibited higher removal efficiency and treatment stability. These results suggested that Fe(0) powder dosing was helpful to improve acidogenesis and decolorization to create a favorable feeding condition for the subsequent methanogenic treatment.
authors.affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering, (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
authors.forename: Yiwen
authors.initials: Y
authors.lastname: Liu
authors.forename: Yaobin
authors.initials: Y
authors.lastname: Zhang
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Zhao
authors.forename: Yang
authors.initials: Y
authors.lastname: Li
authors.forename: Xie
authors.initials: X
authors.lastname: Quan
authors.forename: Shuo
authors.initials: S
authors.lastname: Chen
mesh_terms: D001391:Azo Compounds / Q000378:metabolism*; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002849:Chromatography, Gas; D003116:Color; D004396:Coloring Agents / Q000378:metabolism*; D005285:Fermentation; D017404:In Situ Hybridization, Fluorescence; D007501:Iron; D009841:Oligonucleotides / Q000235:genetics; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D009841:Oligonucleotides; D014874:Water Pollutants, Chemical; D007501:Iron