Use of Hydrophobic Fertilizers to Cover Dairy Slurry Stores to Reduce Emissions of Greenhouse Gases and Other Polluting Gases

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  • 貯留中の乳牛ふん尿スラリーから発生する環境負荷ガスを抑制する撥水加工肥料資材の開発と評価
  • チョリュウチュウ ノ ニュウギュウ フンニョウ スラリー カラ ハッセイスル カンキョウ フカ ガス オ ヨクセイスル ハッスイ カコウ ヒリョウ シザイ ノ カイハツ ト ヒョウカ

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The objectives of this study were to verify the effectiveness in reducing polluting gas emissions of novel methods for covering dairy slurry by using various types of hydrophobic fertilizers and to evaluate the mechanisms for reducing gas emissions from this slurry before and after methane fermentation. The hydrophobic fertilizers were prepared by mixing finely-ground chemical fertilizers (SP: super-phosphate, CC: calcium carbonate, and NP: a mixture of ammonium phosphate and ammonium sulfate) with hydrophobic silica (8wt. %) to make a moisture-proof cover that could float on the slurry. Laboratory trials were carried out for 13 days using a pilot-scale device. The hydrophobic fertilizers composed of SP and NP reduced NH3 and CH4 emissions from the digested slurry remarkably. However, we did not observe any suppression of gases when we applied the hydrophobic fertilizer composed of CC. The effect of the novel covers on the emissions of greenhouse gases and other polluting gases varied with the types of chemical fertilizers depending on acidity-alkalinity, solubility and ability to adsorb these gases. The hydrophobic fertilizer coverings and partial dissolution of their nutritional constituents affected the fermentation process of dairy slurry during storage and consequent gas emissions.

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