屎尿の消化処理に関する研究(第3報) : 屎尿の嫌機性消化に及ぼす塩化カルシウム, その他の影響

概要

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The author studied the influences of the addition of seed sludge and cemicals such as calcium chloride, slaked lime, chalcium carbonate and ferric chloride on the anaerobic digestion of night soil in the batch system. The results obtained were as follows.The anaerobic digestion of night soil was accelerated by increasing the amount of seed sludge. When tha amount of seed sludge was decreased, the curves of gas production showed a time lag in initiating the anaerobic digestion. In the initial stage of anaerobic digestion, the soluble B.O.D. of effuent increased owing to be liquefaction and decomposition of insoluble matter.The addition of slaked lime retarded the anaerobic digestion of night soil remarkably, but the addition of calcium carbonate showed little effect. THe addition of calcium chloride retarded the anaerobic digestion of night soil at a concentraiton higher than about 0.6%, but accelerated at a concentration lower than about 0.6%. THe addition of ferric chloride accelated the digestion at a concentration lower than 0.1%. The addition of calcium chloride and slaked lime is effective in improving the concentration and separation of night soil as described in the previous report, but in the case where one wishes to digest the concentrated and separated fraction of night soil subsequently, both the chemicals are unprofitable.
社団法人日本生物工学会の論文
1960-03-15