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Structural optimization and theoretical analysis of spiral-wound element based on polyethylene/polyamide composite nanofiltration membrane

Authors： SHI Yuerong, WANG Zhongyang, WANG Li, WANG Shuai, TANG Dongli, WANG Li, XIA Jianzhong

Units： Beijing Origin Water Membrane Technology Company Limited, Beijing, 101400；Beijing Origin Water Separation Membrane Technology Company Limited, Beijing, 101400

KeyWords： PENF; spiral-wound membrane element; feed spacer; pressure drop; theoretical analysis

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(2):18-24

Abstract：

Innovative polyethylene/polyamide composite nanofiltration membrane (PENF) has different anti-fouling mechanism and performance. This was attributed to the thin PE support layer which could be easily deformed under the applied pressure. The spiral-wound element preparation parameters of PENF membrane are different with traditional NF membrane, which supported by polysulfone non-woven fabric membrane. In this study, the verification of theoretical analysis and experiment was used to optimize the feed spacer, permeate spacer and membrane page of the element. Explore the influence of deformation and membrane page on the flux and hydraulic performances of feed and permeate channel. The results show that the theoretical calculation results are consistent with experiments. Under the constant membrane surface flow rate, the pressure loss of feed spacer is 3409>2016>3113>1332>2809. The deformation of PENF membrane occupies about 20% to 30% of the cross-sectional area of the permeate channel. In order to obtain the highest packing density and flux, the preparation parameters of three types element of PENF membrane are optimized: 1812 element with 8 pages, 2512 element with 15 pages and 3013 element with 22 pages. Compared with traditional spiral-wound membrane elements, the packing density is increased by 34% to 98%, and the flux is increased by 52% to 160%.

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AuthorIntro：

石月荣（1989-），女，宁夏固原人，研发工程师，硕士，研究方向为分离膜元件优化及流体模拟

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