Mechanical Separation Equipment for Pig Manure and the Efficiency Analysis
Based on the physical and chemical characteristics of pig manure(including pig manure and pig manure anaero-bic digested slurry),the principle,basic structure,separation efficiency as well as both advantages and disadvantages of mechanical separation equipment were investigated in this study.The screen separator has low investment and operating cost but low separation efficiency and high water content of separated solid,thus it is suitable for the pretreatment of pig manure.The press filter separator has the advantages of simple structure,great processing capacity and low water content of separated solid,however,it has higher requirement of feeding concentration.Decanting centrifuge can obtain high separa-tion efficiency and adapt to a wide range of feeding concentrations,while it has both high investment and energy consump-tion.Therefore it is difficult to be applied in small and medium-scale pig farms.The combined types of mechanical separa-tion can effectively increase solid removal efficiency and reduce the solid content of separated digested slurry.
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