屎尿の消化処理に関する研究 (第1報) : 屎尿の揮発性有機酸とB.O.D.

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The author studied the relation between the volatile acids of night soil and 5 days' B.O.D. values of its fractions and obtained the following results : 1) Volatile acids in the night soil were measured by the direct phosphoric acid distillation, and found to be about 4500〜7500 ppm as acetic acid. These acids consisted mainly of acetic acid besides a very little of propionic acid.2) The night soil had about 11000 ppm of total 5 days' B.O.D., in which about 4000 ppm was ascribed to insoluble matter, and about 7000 ppm to soluble matter. The majority, about 67%, of 5 days' B.O.D. of soluble matter was due to the volatile acids in the night soil.3) The biological oxygen demands per 1000 ppm of volatile acids were as follows : formic acid 107 ppm, acetic acid 615 ppm, propionic acid 857 ppm, n-butyric acid 979 ppm, n-valeric acid 829 ppm, caproic acid 408 ppm, night soil acid 742〜900 ppm.4) The availability coefficient of volatile acids, that is the ratio (in per cent) of B.O.D./(theoret. oxygen demand), showed its maximum value (57.7%) in acetic acid and the higher the molecular weight was, the lower became the coefficient.
社団法人日本生物工学会の論文
1959-10-15