title: Discoloration of methylene blue and wastewater from a plant by a Fe/Cu bimetallic system.
abstract: Using a Fe/Cu bimetallic system (Fe/Cu system), the discoloration of both methylene blue in aqueous solution and the colored wastewater from a plant was investigated under the anaerobic condition in batch or continuous reactors. Results show that the Fe/Cu system effectively removed the color with over 88% of color removal efficiency for both methylene blue solution and the wastewater from the plant in batch test. Color removal efficiencies increased rapidly with Fe/Cu dosage and reaction time, respectively, at initial time and slowly to stable values. Optimum pH was neutral range. In addition, in continuous test it also removed the color of the wastewater from the plant with 63% of discoloring efficiency under the condition of 2 h of hydraulic retention time and neutral range of pH (7.0-8.3). High discoloring efficiencies with low chemical oxygen demand removal efficiencies were found in all experiments. The reduction of chromophores in pollutants was the main mechanism of the discoloration in the Fe/Cu system.
authors.affiliation: The National Engineering Research Center for Urban Pollution Control, Tongji University, 1239 Siping Road, Shanghai 200092, PR China. lumingma@online.sh.cn
authors.forename: L M
authors.initials: LM
authors.lastname: Ma
authors.forename: Z G
authors.initials: ZG
authors.lastname: Ding
authors.forename: T Y
authors.initials: TY
authors.lastname: Gao
authors.forename: R F
authors.initials: RF
authors.lastname: Zhou
authors.forename: W Y
authors.initials: WY
authors.lastname: Xu
authors.forename: J
authors.initials: J
authors.lastname: Liu
mesh_terms: D003116:Color; D003300:Copper / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D008751:Methylene Blue / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D003300:Copper; D007501:Iron; D008751:Methylene Blue