し尿浄化槽の浄化機能におよぼす洗条水の影響に関する研究 (第IV報) : 海水使用時と上水使用時の相違点について

概要

論文の詳細を見る
By investigation the gas and the sludge in a septic tank on purification of the sewage, theefficiency of the treatment by using sea water and by city water were compared.The results were as follows:(1) The digestible process of human excrements and the ammoniamizing process of nitrofraction in the first stage of the septic tank were more active in case of the sea water than of the city water. Thus the NH3-N and C.O.D. was maintained in high degree as the result of high solubility of the ammoniac nitrogen, the soluble sulfide and the organic acids to the sewage.However the sewage through the second stage septic tank showed the low degree of the NH3-N and C.O.D.. This might indicate that dissolved substances were evaporated as NH3-, H2S-or CO2-gas or precipitated as metal binding suefide.(2) In case of the sea water, the digestible process of human excrements was so rapid that the products of scum and sludge in the first stage septic tank were remarkabls small in quantity.(3) In case of the sea water, the C.O.D. was maintained in high degree by increasing sulfide and the ratio of B.O.D. to C.O.D. was significantly low.(4) In case of the sea water, the small quantity of formation of NO2 and NO3, and production of coloring and stinking substance in the sewage were observed. This might be due to reducing process of sulfide and the sufficient digestible process.
日本衛生学会の論文