Generally night soil is treated by the method of heating process, but it is digested more rapidly by heating than let it stand without heating, because making safe and stabilization are promoted. Then, pour the raw night soil that mixed digested sludge into each cylinder of 5 liters in the proportion of 20%, and investigated about the prosperity and decay of the B. coli group, enterococcus group, L. acidophilus, and pathogenic bacteria was thrown into the each cyclinder of 5 liters, that were leaved at constant temperature of 37.., 30.., 25.. and 10...
Moreover, making the experiment of pilot plant for continuous treatment and socalled pilot plant for separative strata treatment, follwing results were obtaind.
1. According to experiment of batch test, degeneration of the night soil is rapidly at 37°C, and survival period of B. coli group, L. acidophilus, Salmonella typhi, Salmonella para-typhi B, Komagome B III are only within a week.
2. Accoding to experiment of continuous treatment of night soil by pilot plant at 37°C, B. coli group indicated decrease of 102-3
grade, but still ascent of effect is expected by improvement of structure and operation.
3. Night soil digestion by so-called pilot plant for separative strata treatment combines both gond point of continuous treatment and batch test, so that B. coli group decrease in early stage, and it is treated certainly, and a large quantity night soil can be digested in a short period.
4. Bacteriological examination of digestion tanks in different parts shows various kinds of satisfactory results and not so much.
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