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Removal of 17β-estradiol in laccase catalyzed treatment processes

Frontiers of Environmental Science & Engineering 2014年第3期8卷 372-378页

作者： Qing XIA Deyang KONG Guoqiang LIU Qingguo HUANG aamr alalewi Junhe LU Department of Environmental Science and Engineering Nanjing Agricultural University Nanjing 210095 China Nanjing Institute of Environmental Sciences Ministry of Environmental Protection Nanjing 210042 China Department of Crop and Soil Sciences University of Georgia Griffin GA 30223 USA

The removal of 17β-estradiol （E2） in laccase catalyzed oxidative coupling processes was systematically studied in this work. We focused on the influence of pH and natural organic matter （NOM） on the performance of the enzymatic treatment processes. It was found that the optimal pH for E2 removal was between 4 and 6. The removal of E2 was slightly inhibited in the presence of NOM. Enzymatic transformation of E2 was second-order in kinetics with first-order to both the concentrations of the enzyme and contaminant. Mass spectrum （MS） analysis suggested that coupling products were formed through radical-radical coupling mechanism. The results of this study demonstrated that laccase catalyzed oxidative coupling process could potentially serve as a treatment strategy to control steroid estrogens.

关键词： 17β-estradiol laccase oxidative coupling processes kinetics mechanisms

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Bacterial Influence on Textile Wastewater Decolorization

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Journal of Environmental Protection 2012年第8期3卷 889-903页

作者： aamr alalewi Cuiling Jiang Department of Hydrology and water resources Hohai UniversityChina Nanjing State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityChina Nanjing

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 treatment 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. According to these screening testes, two bacterial isolations were selected as the most potent decolorizer for azo dyes, and they were identified as Comamanas acidovorns-TN1 and Burkholdera cepace-TN5. The optimization process started with the addition of 1 g/l yeast extract, where the decolorization ability of the two strains increased sharply and according to this experiment, the two azo dyes, Acid orange 7 and Direct blue 75, were selected to complete the study. The effect of different conditional and chemical factors on the decolorization process of Acid orange 7 and Direct blue 75 by Comamanas acidovorns-TN1 and Burkholdera cepace-TN5 was studied. Factors that contributed to the difference were different pH, temperature, incubation period, inoculum size, carbon source, nitrogen source and the respective concentrations of yeast extract. This study recommends the application of the two most potent bacterial strains in the decolorization of the azo dyes, along with acid orange 7 and direct blue 75, specifically in the industrial effluents under all nutritional and environmental conditions.

关键词： Decolorization Biodegradation Azo Dys Textile Wastewater

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