Exploration on the Comprehensive Sewage-treatingTechnology in Dairy Farm

摘要

With the development of modern agriculture and the enhancement ofhuman living level, the milk-cow industry has been developed rapidly in China since21st century. However, a milk-cow makes 25kg of dung each day, the draining sewagefrom cowshed contains COD 15539mg/L, BOD 3651mg/L, NH3-N 2298mg/Lrespectively, even removing the cow dung before washing the cowshed. It bringsserious problem in environmental pollution. In order to solve the contradictorybetween development and environment, A technological route was put forward tocontrol the sewage pollution in dairy farm by using biogas fermentation, i.e. thesewage is anaerobically fermented by mesophilous bacteria, the dung residues whichwere separated into sold and liquid parts, the sold used to produce organic manure,and the biogas liquid used to produce the non-harmful fruits and vegetables, thus thewaste materials become an useful ones after the comprehensive utilization,zero-draining of pollution and good ecological recycling will be realized. So thecomprehensive benefits will be attained in environment, ecosystem and energyutilization.