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| Optimization of key parameters for solid-liquid separation of duck liquid manure based on response surface method |
| Received:June 14, 2024 |
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| KeyWord:duck liquid manure;solid-liquid separation;pretreatment;separation effect |
| Author Name | Affiliation | E-mail | | ZHANG Zherui | Institute of Environment and Sustainable Development in Agriculture, CAAS, Beijing 100081, China | | | YAN Ting | Institute of Environment and Sustainable Development in Agriculture, CAAS, Beijing 100081, China | | | WANG Wenzan | Institute of Environment and Sustainable Development in Agriculture, CAAS, Beijing 100081, China | | | ZHANG Zhe | Institute of Environment and Sustainable Development in Agriculture, CAAS, Beijing 100081, China | | | ZHU Zhiping | Institute of Environment and Sustainable Development in Agriculture, CAAS, Beijing 100081, China | zhuzhiping@caas.cn |
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| Abstract: |
| With the intensive and large-scale development of China's meat duck breeding industry, a large amount of breeding manure has been produced. Due to the problems of fine solid particles, high water content and relatively viscous manure in meat duck breeding, the existing solid-liquid separation technology is difficult to meet the requirements of actual production in terms of economic benefits and separation efficiency. The effects of solid content, centrifugal speed and mesh number on the removal of COD, TN andPO43- in meat duck manure were determined by single factor test. The Box-Behnken experimental design was used to carry out the combination test, and finally the design expert obtained the optimal parameter combination, and the prediction results showed that when the solid content was 2%, the centrifugal speed was 2 000 r·min-1, and the mesh number was 150 mesh, the removal rates of COD, TN andPO43- could reach 79.3%, 74.7% and 84.7%. The removal rates of COD, TN and PO43- were 77.6%, 69.7% 和 79.8%, respectively, and the difference between them and the predicted values was less than 5%. It is shown that the prediction of the effect of the pretreatment process of solid-liquid separation of meat duck manure based on the response surface method is relatively accurate. However, although the optimized parameters improve the separation efficiency, the removal effect of mechanical solid-liquid separation technology on contaminants in duck manure is still limited, and it needs to be further improved to meet the needs of actual production. |
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