Heavy metal removal from aqueous solution by wasted biomass from a combined AS-biofilm process.
This study evaluated the capability of metal biosorption by wasted biomass from a combined anaerobic-anoxic-oxic (A2O)-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 6h. 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.
Chang
W C
WC
Department of Environmental & Safety Engineering, National Yunlin University of Science and Technology, Touliu, Taiwan. changwc@yuntech.edu.tw
Hsu
G S
GS
Chiang
S M
SM
Su
M C
MC
D001421:Bacteria, Anaerobic / Q000254:growth & development / Q000378:metabolism*; D018441:Biofilms / Q000254:growth & development; D019149:Bioreactors / Q000382:microbiology*; D018929:Cell Culture Techniques / Q000295:instrumentation / Q000379:methods; D003198:Computer Simulation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007220:Industrial Waste / Q000517:prevention & control*; D019216:Metals, Heavy / Q000302:isolation & purification* / Q000378:metabolism*; D008954:Models, Biological; D012722:Sewage / Q000382:microbiology*; D018511:Systems Integration; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods
D007220:Industrial Waste; D019216:Metals, Heavy; D012722:Sewage