在纺织废水中脱色细菌的影响外文翻译.doc

本科生毕业设计 外文翻译 　 Bacterial Influence on Textile Wastewater Decolorization Aamr Alalewi, Cuiling Jiang 1Department of Hydrology and Water Resources, Hohai University, Nanjing, China; 2State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, China. Email: aamralewi@ Received May 12th, 2012; revised June 15th, 2012; accepted July 17th, 2012 ABSTRACT The study aims to isolate and optimize bacterial strains having the ability to degrade and decolorize azo dyes produced in the final effluent of textile dying industries. In this regard, ten bacterial strains were isolated from wastewater treat- ment plants, and most of them were subjected to the colored effluents resulting from dilapidated houses. The ability of these bacterial isolations to use a wide range of azo dyes to determine the sole carbon source was determined. Keywords: Decolorization; Biodegradation; Azo Dys; Textile Wastewater 1. Introduction Environmental pollution has been identified as a major problem in the modern world. The increasing demand for drinkable water, and its dwindling supply, has made the treatment and reuse of industrial effluents an attractive option. One of the most important environmental pollu- tion problems is the color in water courses; although some of these colors are normally present and of “natu- ral” origins (e.g. the color originates from the activity of microorganisms in ponds), a considerable proportion, especially in the lower reaches of rivers that drain large industrial conurbations, originates from industrial efflu- ents. Some colored effluents are associated with the pro- duction and use of dyes. Azo dyes, the largest chemical class of dyes with the greates variety of colors, have been used extensively for textile, dyeing, and paper painting [1]. These dyes cannot be easily degraded, and some are toxic to higher animals. Azo dyes consist of a diazotized amine coupled with an amine or phenol, and contain one or more azo