| Biosorption behaviors of Cu~(2 ),Zn~(2 ),Cd~(2 ) and mixture by waste activated sludge |
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| 作者单位： | School of Metallurgical Science and Engineering Central South University 2.College of Chemistry and Chemical Engineering，Hunan University，Changsha 410082，China，School of Metallurgical Science and Engineering，Central South University，School of Metallurgical Science and Engineering，Central South University，School of Metallurgical Science and Engineering，Central South University，School of Metallurgical Science and Engineering，Central South University，School of Metallurgical Science and Engineering，Central South University，School of Metallurgical Science and Engineering，Central South University，Changsha 410083，China，Changsha 410083，China，Changsha 410083，China，Changsha 410083，China，Changsha 410083，China，Changsha 410083，China，Changsha 410083，China |
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| 基金项目： | 湖南省科技攻关项目;国家自然科学基金 |
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| 摘 要： | 1Introduction Waste activated sludge is the by-product of sewage treated by activated sludge process.According to incomplete statistic,in China sewage discharge amount is4.474×107m3/d1],and there are more than100sewage treatment plants with different sc…
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Biosorption behaviors of Cu2+,Zn2+, Cd2+ and mixture by waste activated sludge |
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| Authors: | LUO Sheng-lian YUAN Lin CHAI Li-yuan MIN Xiao-bo WANG Yun-yan FANG Yan WANG Pu |
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| Abstract: | Biosorption of heavy metal ions,such as Cu2 ,Cd2 and Zn2 ,was carried out using waste activated sludge from municipal sewage treatment plant as adsorption material,and the effects of parameters,such as pH value,temperature,reaction time and sorption duration,were studied in detail.The results indicate that the removal rates of Cu2 ,Zn2 and Cd2 with low concentration are 96.47%,80% and 90%,respectively,adsorbed by waste activated sludge.Little effect of dosage of activated sludge on the adsorption of Cu2 and more effects on the adsorption of Zn2 and Cd2 are observed.Little effect of temperature is observed,while pH value and adsorption time exert important influence on the sorption process.The adsorption behaviors of heavy metal ions all have parabolic relationships with pH value.The optimum pH value is between 6 and 10,and the optimum adsorption time is 1 h.In single heavy metal ion system,the sorption processes of Cu2 ,Zn2 and Cd2 are in accordance with Freundlich model,which indicates that it is suitable for the treatment of these three heavy metal ions using intermittent operation.In addition,the sorption capacity of the sludge for Cu2 is preferential to the other two ions. |
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| Keywords: | biosorption waste activated sludge heavy metal mixture |
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