屎尿の消化処理に関する研究 (第2報) : 塩化カルシウムその他による屎尿の濃縮分離

概要

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The author established a simple method for estimating the degree of concentration and separation and the rate of concentration of the night soil on the basis of volume (%) and turbidity (%) of liquid fraction determined by the simple sedimentation experiments, and then investigated the effect of added calcium chloride, slaked lime and calcium carbonate on the efficiency of concentration and separation of night soil by the use of the above method.The night soil was stratified and separated into three fractions (scum, liquid and sediment) by the addition of calcium chloride. The concentrated fractions of scum and sediment contracted with time, consequently the concentration and separation of night soil could be carried out efficiently.The optimum concentration of calcium chloride was about 1% for the agglutination of suspended solids contained in the night soil, and about 1.5〜2.5% for the concentration and separation of the night soil. The concentration and separation of the night soil by the addition of calcium chloride was conducted more effectively than those with slaked lime and calcium chloride, and the degree of concentration became higher as the temperature is raised higher.But the addition of the above chemicals did not effect in lowering the soluble B.O.D. and the volatile acids in the night soil.
社団法人日本生物工学会の論文
1960-01-15