Characteristics of Growth of Activated Sludge Cultivated with Cow's Milk

概要

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An activated sludge was cultivated with cow's milk to prepare a sample to study a metabolism of organic substrate by activated sludge, and to compare characters of the sludge cultivated with cow's milk with those cultivated with artificial sewage containing glucose, polypepton etc.. The characteristics of growth of the sludge were investigated as a preliminary test. It seems that our attempt was successful at least on finding the culture conditions enable to obtain a stable activated sludge by using cow's milk as a substrate. It is necessary for the growth of activated sludge that initial load of cow's milk per initial concentration of MLSS (F_o/M_o) exceeds 0.8-0.9 mL cow's milk/gMLSS per day. When F_o/M_o exceeded about 1.5mL cow's milk/gMLSS per day, SV_30 increased rapidly, filamentous microorganisms grew in the sludge, and SVI exceeded 200. An increase in MLSS with cultivation caused decrease of F_o/M_i (i : cultivation days), filamentous microorganisms disappeared and SVI decreased. The activated sludge is able to be utilized conveniently as a sample for the education of environmental science.
岡山理科大学の論文