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KMID : 0669519910010000062
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Journal of Health Science - Yonsei University
1991 Volume.1 No. 0 p.62 ~ p.70
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Application of Biosorbents to the Treatment of Heavy Metal Wastewaters
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Abstract
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Microorganisms and their derivatives are known to interact with and accumulate various metal ions from aqueous solution. The metal accumulation is often selective and significant. This ability is being utilized to treat industrial wastewater containing heavy metals and to recover valuable metals from process streams and natural waters. However, most native microorganisms need some physical modification to be used as technical biosorbents in a packed bed operation. Membrane encapsulation of R. arrhizus was carried out using a spouted bed coater in order to immobilize the biomass. Mass transfer of pore forming additive, CaCO_(3) from the coated membrane and uranium uptake by the immobilized biomass was determind in a modified liquid Carberry reactor. Membrane structure of immobilized biomass was observed by using a scaning electron microscope. The pore structure appeared to be unifrom across the membrane layer and the porosity could be controlled by adjusting the ratio of polymer to additive in the coating solution. Leaching rate of CaCO_(3) additive was strongly affected by the pH of the leaching solution and the polymer/additive ratio.
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