屎尿消化におけるガス発生に関する研究
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There are several important problems to be solved in connection with night soil digestion tanks in the urban community. As part of the program for the study of night soil disposal, the author carried out experiments on the production of gas during the digestion of night soil under different conditions. The experiments, conducted with the specific purpose of examining the influence of difference in temperature on night soil gasification, comprised the digestion, at temperatures of 37℃ and 30℃, of various samples of night soil in digestion chambers. An apparatus specially designed to keep the pressure in the chamber at the level of atmospheric pressure was employed, so that collection of gas liberated by the digesting night soil might not influence volatile matter reduction rates. Gas production during the digestion of night soil at both 37℃ and 30℃, like gas production in sewage solids digestion, is a two-stage process, consisting of the first and second stages of gasification. The course of night soil digestion, as traced by cummulative gas production, is an S-shaped curve. When night soil was seeded with welldigested sludge, the rate of gas production was higher at a temperature of 37℃ than at 30℃, giving ground for supposition that the digestion of night soil might be expedited at higher temperatures. Even thoug the addition of sludge, gas production at 37℃ was at a higher level than gas production at 30℃. A study of the first stage of gas production alone shows that it will be impossible to declare categorically that the volume of gas produced is larger at 37℃ than at 30℃. It would seem that the amount of gas produced varies with the degree of digestion that various samples of night soil have attained before they are put in digestion chambers for experiments.
- 千葉大学の論文
- 1959-01-28
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