화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.9, No.6, 735-742, November, 2003
Characteristics of Porous Ceramic Carriers made from Fly Ash for Immobilization of Microorganisms
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The purpose of this study is to develop the porous ceramic carrier made from fly ash for immobilization of microorganisms which can be applied to the effective removal of nitrogen in wastewater. For the purpose, attempts were carried out to investigate the effects of pore structure in the prepared carrier on the immobilization of microorganisms and to determine the optimum conditions for preparation of the carrier. And the surface of the prepared carriers was treated with NaOH solution at 100 ℃ for 4 hrs to provide the cation exchange capacity by the transformation of a fly ash into a zeolite. As a result, we could control the porosity and pore size of the carrier by varying the amount and particle size of polyethylene added, respectively. The number of immobilized microorganisms increased with the pore volume of the appropriate size for colonization of microorganisms. And it seems that the immobilization capacity depends on the pore size rather than the porosity. The result also showed that immobilization capacities of the prepared carriers were about 3 times as high as the commercial carrier. The carrier which was treated with 4M NaOH solution at 100 ℃ for 4 hrs showed higher cation exchange capacity than the natural zeolite without the change of bulk shape. It is expected that the prepared carrier can be effectively applied to the removal process of nitrogen in wastewater.
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