抄録
Odor problem by algal bloom is one of new problems to be additionally removed from supplied water. The author has developed a biological process by gravel sand filtration to remove the odor. Here in this paper, application of a cermic membrane is tested in order to know whether it can support the biological activities as gravel sand can do. Experimental findings are as follows; 1) filtration speed of a lake water was about 1 m/day per membrane surface, 2) odor substance 2-methyl isoborneol was biologically removed more than 80%, 3) bacterial leak from the process was minimum because the pore of the membrane was less than 0.1μm, 4) chlorine consuming organics were biologically removed to a limitted extent in addition to the odor removal, 5) from the process, a species of bacteria wich can decompose fumic acid was isolated and identified.
