title: Treatment of diazo dye C.I. Reactive Black 5 in aqueous solution by combined process of interior microelectrolysis and ozonation.
abstract: Interior microelectrolysis (IM) as a pretreatment process was effective to treat Reactive Black 5 (RB5) in this study. The removal rates of chemical oxygen demand (COD), total organic carbon (TOC) and color were 46.05, 39.99 and 98.77%, respectively, when this process was conducted under the following optimal conditions: the volumetric ratio between iron scraps and active carbon (AC) (V(Fe)/V(C)) 1.0, pH 2.0, aeration dosage 0.6 L/min, and reaction time 100 min. Contaminants could be further removed by ozonation. After subsequent ozonation for 200 min, the solution could be completely decolorized, and the COD and TOC removal rates were up to 77.78 and 66.51%, respectively. In addition, acute toxicity tests with Daphnia magna showed that pretreatment by IM generated effluents that were more toxic when compared with the initial wastewater, and the toxicity was reduced after subsequent ozonation.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, 163 Qixia Road, Jiangsu Nanjing 210023, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Guo
authors.forename: Yaping
authors.initials: Y
authors.lastname: Cai
authors.forename: Zhongbo
authors.initials: Z
authors.lastname: Wei
authors.forename: Haifeng
authors.initials: H
authors.lastname: Hou
authors.forename: Xi
authors.initials: X
authors.lastname: Yang
authors.forename: Zunyao
authors.initials: Z
authors.lastname: Wang
mesh_terms: D002606:Charcoal / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry; D004572:Electrolysis; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D009282:Naphthalenesulfonates / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry; D013997:Time Factors; D062065:Wastewater / Q000633:toxicity; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D002606:Charcoal; D004396:Coloring Agents; D007501:Iron; D009282:Naphthalenesulfonates; D010126:Ozone; D062065:Wastewater; D014874:Water Pollutants, Chemical; C063421:Remazol black B