Dewatering of livestock waste using by liquefied dimethyl ether

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In this study, an advanced dewatering process for livestock manure, operated at room temperature with low energy requirements due to the use of liquefied dimethyl ether (DME), was investigated experimentally to generate dry livestock manure as a solid fuel.The results showed that the 80% water content in cattle manure was decreased to 5.7% when DME was applied at 38 mL-DME/g-manure with a 70 min dewatering time, which represented the optimized dewatering conditions. Under these conditions, the wet based lower heating value of the dewatered manure was 18 times higher than that of the original cattle manure, and odor and self-pyrogenicity of the dewatered manure were decreased by liquefied DME dewatering. As for the behavior of the medicinal products used by veterinarians, the more hydrophobic medicinal products is, the higher it have an extractability by liquefied DME. Therefore, a DME dewatering system could be controlled by hydrophobic environment.