The Importance of the Surface Charge on Support Media for Microbial Adhesion

概要

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Using cristobalites treated at various temperatures, methane fermentation tests were carried out in an anaerobic fluidized-bed reactor (AFBR). Cristobalites treated below 1,000℃ had almost the same qualities in terms of components, physical properties, and surface structures. However, point of zero charge were different between cristobalites treated below 600℃ and those treated above 800℃. Points of zero charge on the former numbered about 5 and their surfaces were positively charged in the fermentor controlled pH at 7,while points of zero charge of the latter numbered above 8 and surfaces were negatively charged. In the methane fermentation tests, a TOC removal efficiency of 78% was obtained using positively charged cristobalite at a TOC loading rate of 8 g/l・h, but with negatibely charged cristobalite, the efficiency was only 63% under the same conditions. This result confirms the importance of the surface charge on the support medium for the anaerobic digestion in an AFBR.
社団法人日本生物工学会の論文
1992-04-25