絹精錬排水の活性汚泥処理

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Investigation of the chemical pretreatment and the activated sludge treatment of silk scouring waste water were performed in order to obtain basic data. The results obtained were as follows;1. Pretreatment was caried out by acidification, adding sulfuric acid solution to the waste water. The acidified waster water formed floc which was found to have optimum pH range of 3.0-3.5 for flocculation and to contain a nonionic surfactant (BD-204,manufactured by Nikka kagaku Kogyo Co) used in scouring process and sericine from the raw silk as organic substances. About 50% COD_<Cr> of the waste water was reduced by the removal of settled floc.2. Activated sludge treatment of the pretreated waste water was conducted after neutralization with sodium hydroxide solution. In a batch test, activated sludge accliminated to the waste water for a month showed the best growth on the waste water with 40 ppm monobasic potassium phosphate added, and was found to have optimum pH of 8.6,optimum temperature of 36℃, maximum specific growth rate of 0.12 hr^<-1>, yield constant of 0.39 for COD_<Cr>, saturation constant of 296 ppm for COD_<Cr> and autoxidation coefficient of 0.118 day^<-1>. A continuous test was carried out at the dilution rate of 1/8hr^<-1>, MLSS concentration of 2600 ppm, and in the COD_<Cr> loading rasnge of 0.69-2.0 kg. kg^<.-1>. day^<-1>. 80% COD_<Cr> of the chemical pretreated waste water was reduced in the continous test and the sludge volume index consistently showed about 80 ml.g^<-1>. From the test, it was suggested that the waste water contained COD_<Cr> components resistant to biodegradation, such as detergents.
社団法人日本生物工学会の論文
1974-09-25

絹精錬排水の活性汚泥処理

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