Decolorization of Orange Ⅱ using an anaerobic sequencing batch reactor with and without co-substrate

• 作 者: Soon-An Ong Eiichi Toorisaka M
• 机 构: Department of Applied Chemistry, OitaUniversity, Oita 870-1192, Japan“,”School of Environmental Engi
• 出 处: 环境科学学报（英文版）
• 发表日期: 2012年2期
• 关键词: anaerobic reduction azo dye decolorization rate endogenous lysis Orange Ⅱ

We investigated the decolorization of Orange Ⅱ with and without the addition of co-substrates and nutrients under an anaerobic sequencing batch reactor (ASBR).The increase in COD concentrations from 900 to 1750 to 3730 mg/L in the system treating 100 mg/L of Orange H-containing wastewater enhanced color removal from 27％ to 81％ to 89％,respectively.In the absence of co-substrates and nutrients,more than 95％ of decolorization was achieved by the acclimatized anaerobic microbes in the bioreactor treating 600 mg/L of Orange Ⅱ.The decrease in mixed liquor suspended solids concentration by endogenous lysis of biomass preserved a high reducing environment in the ASBR,which was important for the reduction of the Orange Ⅱ azo bond that caused decolorization.The maximum decolorization rate in the ASBR was approximately 0.17 g/hr in the absence of co-substrates and nutrients.