研究了CrS@酵母复合吸附剂对阳离子型染料亚甲基蓝的吸附性能,考察了在不同pH值、流速V、床高H、初始浓度c_0条件下对亚甲基蓝染料的吸附效果,以探究最佳吸附条件。结果表明,在溶液pH值为3,流速5 m L/min,床高H=1.5 cm,初始浓度c=50 mg/...研究了CrS@酵母复合吸附剂对阳离子型染料亚甲基蓝的吸附性能,考察了在不同pH值、流速V、床高H、初始浓度c_0条件下对亚甲基蓝染料的吸附效果,以探究最佳吸附条件。结果表明,在溶液pH值为3,流速5 m L/min,床高H=1.5 cm,初始浓度c=50 mg/L时吸附效果最好。采用动力学模型Yoon-Nelson对不同条件下吸附曲线进行分析,相关系数R^2均大于0.9,本次研究结果对于甲基蓝废水的处理具有很重要的参考价值,并且对于我国染料废水的处理可提供借鉴。展开更多
Hexavalent chromium （Cr（VI）） pollution has become one of the most serious environmental problems today. One removal strategy comprises the microbial reduction of Cr（VI）, is regarded as a cost-effective biotechno...Hexavalent chromium （Cr（VI）） pollution has become one of the most serious environmental problems today. One removal strategy comprises the microbial reduction of Cr（VI）, is regarded as a cost-effective biotechnology for the treatment of high volume and low concentration complex wastewaters. In this work a yeast strain that exhibits high Cr（VI） resistance was isolated from soil sediment. The isolated yeast was identified as Pichia anomala by sequencing analysis. The yeast showed a remarkable capacity to completely reduce 25 and 50 mg/L of Cr（VI） in 48 h under aerobic conditions. The increase of initial Cr（VI） concentration influenced reduction, growth and specific growth rate. This strain also exhibited multiple heavy metal tolerance. The presence of anions and cations in the medium had a great influence on chromium reduction. Fractionation of the cells showed that the mechanism of Cr（VI） removal by this strain is ＂adsorption-coupled reduction＂ and the hexavalent chromate reductase activity was expressed constitutively. FTIR analysis of the biomass exposed to chromium showed that the binding process of the chromium ions involves the active participation of functional groups present in the external surface of biomass. High Cr（VI） concentration resistance and high Cr（VI） reducing ability of this strain make it a suitable candidate for bioremediation.展开更多
文摘研究了CrS@酵母复合吸附剂对阳离子型染料亚甲基蓝的吸附性能,考察了在不同pH值、流速V、床高H、初始浓度c_0条件下对亚甲基蓝染料的吸附效果,以探究最佳吸附条件。结果表明,在溶液pH值为3,流速5 m L/min,床高H=1.5 cm,初始浓度c=50 mg/L时吸附效果最好。采用动力学模型Yoon-Nelson对不同条件下吸附曲线进行分析,相关系数R^2均大于0.9,本次研究结果对于甲基蓝废水的处理具有很重要的参考价值,并且对于我国染料废水的处理可提供借鉴。
文摘Hexavalent chromium （Cr（VI）） pollution has become one of the most serious environmental problems today. One removal strategy comprises the microbial reduction of Cr（VI）, is regarded as a cost-effective biotechnology for the treatment of high volume and low concentration complex wastewaters. In this work a yeast strain that exhibits high Cr（VI） resistance was isolated from soil sediment. The isolated yeast was identified as Pichia anomala by sequencing analysis. The yeast showed a remarkable capacity to completely reduce 25 and 50 mg/L of Cr（VI） in 48 h under aerobic conditions. The increase of initial Cr（VI） concentration influenced reduction, growth and specific growth rate. This strain also exhibited multiple heavy metal tolerance. The presence of anions and cations in the medium had a great influence on chromium reduction. Fractionation of the cells showed that the mechanism of Cr（VI） removal by this strain is ＂adsorption-coupled reduction＂ and the hexavalent chromate reductase activity was expressed constitutively. FTIR analysis of the biomass exposed to chromium showed that the binding process of the chromium ions involves the active participation of functional groups present in the external surface of biomass. High Cr（VI） concentration resistance and high Cr（VI） reducing ability of this strain make it a suitable candidate for bioremediation.
