Degradations of urobilin and stercobilin during activated sludge treatment of night soil.
This paper deals with the degradation of urobilin and stercobilin in the sewage treatment plant or domestic septic tank and elucidates the factors contributing to their decomposition. The quantities of urobolin or stercobilin in the effluents from the sewage treatment plants were low and these substances were degraded by treatment with activated sludge. The efficacies of aeration, bacterial decomposition and free chlorine treatment in degrading urobilin or stercobilin were examined. Urobilin and stercobilin were decomposed by aeration and the decomposition rate was accelerated under alkaline conditions. Both compounds were decomposed by activated sludge, isolated bacteria and free chlorine treatments. These results show the decomposition of urobilin and stercobilin at sewage treatment plants.
Miyabara
Y
Y
Faculty of Pharmaceutical Sciences, Science University of Tokyo, 12, Ichigaya Funagawara-machi, Shinjuku-ku, Tokyo, 162, Japan.
Suzuki
J
J
Suzuki
S
S