Development of a Continuous Hydrothermal Decomposition System as Night Soil Treatment Method

概要

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The final aim of this study is to make night soil reuse on farm-land reduction as liquid fertilizer.In this present paper, a continuous hydrothermal decomposition system for the night soil treatnemt in pipe-line was designed and manufactured. The plant had the injection pump incorporated with a mechanism of the exhaust-pressure recovery, the hydrothermal reactor, and oxygen gas supply equipment. The reactor was made of SUS 304, and was heated by independent four furnaces for protecting the thermal difference in the reactor. Measurement of the decomposition temperature was performed by inserting a thermocouple into the reactor.The night soil was easily decomposed under hydrothermal condition by using the autoclave of batch type. The decomposition ratio over 90% was obtained at 300°C of reaction temparature, for 10min. of reaction time, and at 20kg/cm2 of oxygen gas. The test run of the apparatus was performed, and the hydrothermal conditions, which was similar to these for the autoclave of batch type, were achieved.
農業施設学会の論文