title: Effects of reduction products of ortho-hydroxyl substituted azo dyes on biodecolorization of azo dyes.
abstract: The mediated effects of reduction products of some ortho-hydroxyl substituted azo dyes on biodecolorization were investigated. The results indicated that the addition of reduction products could effectively accelerate dye decolorization by Shigella sp. QRZ-1. The best accelerating effect was obtained with the addition of reduction products of Acid Red 14 (AR14), resulting in an over 3-fold increase in decolorization efficiency of many azo dyes. In sequencing batch reactor experiments, the accelerating effect of reduction products of AR14 was more obvious (1.5-fold) during the startup of the system. When the dye concentration was increased to 500 mg L(-1), the accelerated decolorization efficiency was still maintained around 95%. The presence of AR14 in the feed enhanced the decolorization performance of anaerobic sludge, indicating that the strategy may be beneficial for practical application. 1-Naphthol-2-amino-4-sulfonic acid, which is one of the reduction products of AR14, may function as redox mediator to speed up azo dye biodecolorization.
authors: Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China.
authors: Guangfei
authors: G
authors: Liu
authors: Jing
authors: J
authors: Wang
authors: Hong
authors: H
authors: Lu
authors: Ruofei
authors: R
authors: Jin
authors: Jiti
authors: J
authors: Zhou
authors: Long
authors: L
authors: Zhang
mesh_terms: D001391:Azo Compounds / Q000737:chemistry* / Q000378:metabolism; D019149:Bioreactors; D002621:Chemistry / Q000379:methods*; D002851:Chromatography, High Pressure Liquid; D004396:Coloring Agents / Q000737:chemistry* / Q000378:metabolism; D004275:DNA, Ribosomal / Q000235:genetics; D013058:Mass Spectrometry / Q000379:methods; D008956:Models, Chemical; D010084:Oxidation-Reduction; D010802:Phylogeny; D012722:Sewage; D012760:Shigella / Q000378:metabolism; D013816:Thermodynamics; D018508:Water Purification / Q000379:methods
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D004275:DNA, Ribosomal; D012722:Sewage