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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 6    December 2006

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Biosorption behaviors of Cu2+, Zn2+, Cd2+ and mixture by waste activated sludge
LUO Sheng-lian(罗胜联)1, 2, YUAN Lin(袁 林)1, CHAI Li-yuan(柴立元)1
MIN Xiao-bo(闵小波)1, WANG Yun-yan(王云燕)1
FANG Yan(方

1. School of Metallurgical Science and Engineering, Central South University,
 Changsha 410083, China; 
2. College of Chemistry and Chemical Engineering, Hunan University, 
Changsha 410082, China

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.

 

Key words: biosorption; waste activated sludge; heavy metal mixture

ISSN 1672-7029
CN 43-1423/U

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