屎尿の化学処理における弗化ソーダの応用の研究
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概要
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The use of digestion tanks has been considered one of the best methods for treating night soii. It takes a long time, however, to digest night soil by this method. Besides, the cost involved in constructing and running tanks is quite high as compared with the cost for equipments used under other methods. The advantage of chemical treatment of night soil lies in the fact that it involves a procedure which can be carried out quickly with a smallscale equipment. We have had under way a study on chemical treatment of night soil, and yet there are still many problems to be solved. In the course of a comparative study of chemicals which might have properties required of a sedimentation agent and bactericide, the author has found that NaF serves this purse. Details of a method for application of NaF to night soil disposal is described in this paper. Fluorine-ion is liberated through electrolysis so that it may work effectively on night soil. A carbon rod and a copper sheet are used as an anode and a cathode respectively in night soil to which NaF solution has been added. A cellophane membrane is used between the anode and the cathode. Determination of the purification grade of the supernatant of night soil is based on estimation of its transparency, the reduction in biochemical oxygen demand and chemical oxygen demand, and a decrease in the number of living bactria in it. Experimental results have shown that the supernatant of night soil thus treated could be thrown awy into rivers and the sea without doing any harm.
- 千葉大学の論文
- 1962-03-28