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| Experimental study on pretreatment of plate ultrafiltration membrane for biogas slurry |
| Received:May 14, 2020 |
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| KeyWord:biogas slurry pretreatment;plate ultrafiltration membrane;membrane filtration;ultrafiltration |
| Author Name | Affiliation | E-mail | | YANG Gu-kun | New Rural Development Institute of Tongji University, Shanghai 200092, China | | | ZHU Hong-guang | New Rural Development Institute of Tongji University, Shanghai 200092, China | hongguang_zhu@163.com | | SHEN Gen-xiang | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | ZHANG Zhong-hua | New Rural Development Institute of Tongji University, Shanghai 200092, China | | | SHI Hui-xian | New Rural Development Institute of Tongji University, Shanghai 200092, China | | | WANG Dan-yi | New Rural Development Institute of Tongji University, Shanghai 200092, China | | | QIAN Xiao-yong | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | SHI Jian-guo | Shanghai Linhai Ecological Technology Co., Ltd., Shanghai 200233, China | |
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| Abstract: |
| How to reduce the pollution of ultrafiltration membrane to the lowest level is an important issue. The ultrafiltration process is applied to the concentration of liquid organic fertilizer by membrane filtration of biogas slurry. Experimental study are determined to minimize the influence of concentration polarization. Pick up the biogas slurry in a farm and observe the flux change and removal of the plate-type ultrafiltration membrane under different pressures under different pressures. Under the pressure of 0.05~0.25 MPa, the initial flux of the plate type ultrafiltration membrane decreased rapidly.After 10~30 min, the flux decreased slowly and became stable, which was in good agreement with the empirical formula of membrane flux attenuation. The flux of the plate ultrafiltration membrane increased with the increase of pressure, but the growth rate gradually decreased. The membrane rejection rate has little to do with the pressure change. The removal rate of COD is relatively high, about 70%. The removal rate of NH4+-N, K+ and other small molecular substances is relatively poor, only 22%~40%. The small molecular nutrients are well preserved. The nutrient index of the filtrate is 0.16% for organic matter, 0.217% for inorganic total nutrition, and 10:1.12:6.04 for N-P2O5-K2O. The nutrient ratio is relatively good, but the organic matter content is relatively low, so subsequent concentration steps are needed.The experimental results show that the filtrate of plate ultrafiltration membrane basically meets the ions and pH value requirements of nanofiltration and reverse osmosis. |
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