Selected physical and chemical cleanings remove biofilm in seawater membrane distillation without causing pore wetting

IF 10.4 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Najat A. Amin, Harun Elcik, Alla Alpatova, Graciela Gonzalez-Gil, Bastiaan Blankert, Nadia Farhat, Johannes S. Vrouwenvelder, Noreddine Ghaffour
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Abstract

Membrane distillation (MD) is an emerging process with a proven ability to recover freshwater from streams with a wide range of salinities. However, MD is susceptible to biofouling. This study explores the efficiency of different cleaning strategies in biofilm removal during seawater MD. Hydraulic cleaning and chemical cleanings with 0.3%w w−1 ethylenediaminetetraacetic acid (EDTA), 0.3%w w−1 NaOCl, and 3%w w−1 citric acid were tested. The results showed that permeate flux recovery increased in the order of hydraulic cleaning <3%w w−1 citric acid <0.3%w w−1 NaOCl ≈0.3%w w−1 EDTA. Membrane cleanings substantially reduced the thickness of the residual biofilm layer and decreased its bacterial concentration and resistance to vapor pressure. The post-cleaning permeate conductivities were low suggesting that employed cleaning protocols did not cause pore wetting of hydrophobic polytetrafluoroethylene microporous (0.22 μm) membrane, and membrane rejection properties remained stable.

Abstract Image

Abstract Image

选定的物理和化学清洗可以去除海水膜蒸馏中的生物膜,而不会导致孔隙润湿
膜蒸馏(MD)是一种新兴工艺,已被证明能够从盐度范围广泛的溪流中回收淡水。然而,膜蒸馏容易受到生物污染的影响。本研究探讨了不同清洁策略在海水 MD 过程中去除生物膜的效率。测试了水力清洗和使用 0.3%w w-1 乙二胺四乙酸(EDTA)、0.3%w w-1 NaOCl 和 3%w w-1 柠檬酸的化学清洗。结果表明,渗透通量的恢复依次为水力清洗<3%w w-1 柠檬酸<0.3%w w-1 NaOCl ≈0.3%w w-1 EDTA。膜清洗大大减少了残留生物膜层的厚度,降低了细菌浓度和抗蒸汽压能力。清洗后的渗透电导率很低,这表明所采用的清洗方案不会导致疏水性聚四氟乙烯微孔膜(0.22 μm)的孔隙润湿,膜排斥性能保持稳定。
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来源期刊
npj Clean Water
npj Clean Water Environmental Science-Water Science and Technology
CiteScore
15.30
自引率
2.60%
发文量
61
审稿时长
5 weeks
期刊介绍: npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.
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