Dewatering of livestock waste using by liquefied dimethyl ether

在这项研究中，一种先进的牲畜粪便脱水工艺，由于使用液化二甲醚（DME），结果表明，当DME用量为38 mL-DME/g时，牛粪中80%的水分可降至5.7%。最佳脱水条件为：有机肥脱水时间70 min。在此条件下，脱水后牛粪的湿基低热值比未脱水牛粪高18倍，液化二甲醚脱水后牛粪的臭味和自热性降低。对于兽医使用的药品的行为，疏水性越强的药品，其通过液化DME的可浸提性越高。因此，DME脱水系统可以通过疏水环境来控制。

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.