Nihon Yoton Gakkaishi

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The enclosed vertical type composting facilities (Compo) were popular among pig farms in Japan to ferment pig manure. A Compo has sealed tank, and the energy in pig manure transferred as heat in the process of fermentation were exhausted as concentrated hot gas. To use the energy in the exhaust gas from Compo, we examined income of the fermentation energy produced from 700kg/day of pig and chicken manure and outgo of the heat energy as hot exhaust gas from Compo (tank capacity 10m³). The decomposition rate was 1.6%/day in the summer, and 2.3%/day in winter. The temperatures in a fermentation tank in upper point were hotter than lower point. The average temperature of exhaust gas in winter was 51.2°C and the average volume of an exhaust gas of 180m³/h, the heat quantity in the gas was estimated as 60MJ/h. The heat quantity in the exhaust gas from Compo estimated almost same as the total of heat energy intake to the facility, which from fermentation of manure, to heat the blower, and atmosphere. Date suggested the Compo transferred the energy in manure as heat and concentrated the fermentation energy in the hot exhaust gas, it would be possible to effective use of recovery energy as heat in the hot exhaust gas from Compo using by the heat exchanger.

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