期刊
BIORESOURCE TECHNOLOGY
卷 97, 期 13, 页码 1503-1508出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2005.06.011
关键词
wasted sludge; extracelluler polymer; metal removal; biosorption; wasteweater treatment
This study evaluated the capability of metal biosorption by wasted biomass from a combined anaerobic-anoxic-oxic (A20)-biofilm process with simultaneous nitrogen and phosphorus removal. Zinc, cadmium and nickel were rapidly adsorbed in 20 min by the harvested sludge from a continuous-flow pilot-plant. Biosorption equilibrium was then reached in 6 h. The biosorption isotherm showed that metal biosorption behavior had fitted well to the Freundlich isotherm, but not Langmuir isotherm. The capacity constants k of Freundlich model for nickel, zinc and cadmium were 0.471, 0.298 and 0.726, respectively; the affinity constants 1/n were 0.444, 0.722 and 0.718, respectively. The order of metal affinity for the wasted biomass was Zn > Cd > Ni, which was in conformity to the other biosorption results with different biological sludge. (c) 2005 Elsevier Ltd. All rights reserved.
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