Experimental Study between Japan and China toward Co-benefit Policy:Organic Waste Recycling and Water Pollution Prevention

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Animal waste has caused serious water pollution in China. So we chose a pig farmselling 28 thousand pigs and neighboring famers, conducted experiment on use ofmethane fermentation digestion as liquid fertilizer, and evaluated the environmental and economic effect. In three years, farmland area using liquid fertilizer has increased from zero to 40ha and farmers successfully saved the large amount of fertilizer cost. This study also showed that discharge of fermentation digestion was prevented and use of liquid fertilizer contributed to the organic waste recycling, improvement of water environment, and reduction of greenhouse gas