1995 Volume 18 Issue 4 Pages 315-323
The effects of clay on the fouling due to algogenic organic matter in the cross-flow ultrafiltration (MWCO 50,000, polysulfone, 100 kPa) were evaluated by algal cells, intercellular organic matter (IOM), extracellular organic matter (EOM) and anaerobic and aerobic decomposition products of algae in the presence of clay. The algae selected in this study were Microcystis aeruginosa, Chlorella pyrenoidosa and Melosira granulate. Algae was taken by plankton nets in Lake Tsukui in order to obtain anaerobic and aerobic decomposition of algae products. The kaolin was used as clay in this study. The flux of dispersions containing algal cells decreased with an increase in the cells number of algae, but increased with coexistence of kaolin. The flux of dispersions containing EOM and microbial decomposition products decreased with the increase of the fraction of organic matter having molecular weight more than molecular weight cut-off (MWCO) of membrane.
The flux of dispersions containing these organic substances with coexistence of kaolin decreased with the increase of the amount of kaolin, but they had nothing to do with their molecular weight distribution. The flux of dispersions containing IOM was not affected by the coexistence of kaolin.
