| 摘要 |
A method and an apparatus for treating livestock excretion are provided to purify the livestock excretion and collect resources efficiently, by performing a pretreatment process, an adjustment process, a methane fermentation process, a temperature decrease process, and a bath reaction process, and three treatment processes on the livestock excretion. A pretreatment process is performed by removing adulterant and sediment from livestock excretion(S210). An adjustment process is performed by homogenizing the flow rate and concentration of the livestock excretion passed by the pretreatment process(S220). An acid fermentation process is performed by converting the homogenized livestock excretion into dissolvable organic matter through acid fermentation and performing solid-liquid separation through precipitation(S230). A methane fermentation process is performed by recovering methane gas and precipitating sludge from the dissolvable organic matter through methane fermentation(S240). A temperature decrease process is performed by decreasing the temperature of the treated water, which is generated during the methane fermentation process, to a temperature suitable for aerobic treatment, 30‹C(S250). A batch reaction process is performed by removing residual organic matter and nutrient salt and precipitating sludge from the treated water, which is generated during the temperature decrease process(S260). A refinement process is performed by removing carbon dioxide, hydrogen sulfide, and moisture from the methane gas generated during the methane fermentation process. A cogeneration process is performed by collecting electricity and waste heat using the refined methane. A dehydration process is performed by dehydrating the sludge generated during the acid fermentation process and the methane fermentation process. A dry process is performed by drying the dehydrated sludge using the waste heat. Further, a third treatment process is performed by removing additionally hardly-degradable organic compounds and nutritive salts remaining after the batch reaction process. |
