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首页> 外文期刊>Separation and Purification Technology >The effects of pretreatment on nanofiltration and reverse osmosis membrane filtration for desalination of oil sands process-affected water
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The effects of pretreatment on nanofiltration and reverse osmosis membrane filtration for desalination of oil sands process-affected water

机译：预处理对油砂工艺影响水脱盐的纳滤和反渗透膜过滤的影响

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摘要

Oil sands process-affected water (OSPW) is largely produced from the oil sands operational process and requires the removal of toxicants for reuse. Nanofiltration (NF) and reverse osmosis (RO) membrane applications can be used to remove salt ions from OSPW. However, membrane treatments of OSPW are impeded by membrane fouling due to suspended solids; therefore, feed water must be pretreated to manage fouling. This research investigated NF and RO pretreatment methods such as coagulation-flocculation-sedimentation (CFS), with and without coagulant and coagulant aids. The optimal concentration of coagulant was verified by examining water turbidity and membrane surface zeta potential. The results show that membrane permeability was enhanced by the addition of coagulant and coagulant aids. Organic and oily constituents in OSPW increased the negative charge and hydrophobicity of the membrane, decreasing membrane performance. The flux recovery ratio was used to measure the effects of physical and chemical washing. Efficient chemical cleaning was achieved with 1 mM acid; flux recovery was achieved to 81% after cleaning. This study reveals that the pretreatment improves desalination of OSPW for both NF and RO membranes.
机译：受油砂工艺影响的水（OSPW）大部分是从油砂操作过程中产生的，需要去除有毒物质才能重复使用。纳滤（NF）和反渗透（RO）膜应用可用于从OSPW中去除盐离子。然而，由于悬浮固体导致膜结垢，阻碍了OSPW的膜处理。因此，必须对给水进行预处理以控制结垢。这项研究调查了NF和RO预处理方法，例如有无凝结剂和助凝剂的凝结-絮凝-沉淀（CFS）。通过检查水的浊度和膜表面ζ电势来确定最佳的混凝剂浓度。结果表明，通过添加凝结剂和助凝剂可以提高膜的渗透性。 OSPW中的有机和油性成分增加了膜的负电荷和疏水性，从而降低了膜的性能。焊剂回收率用于测量物理和化学洗涤的效果。用1 mM的酸进行有效的化学清洁;清洗后焊剂回收率达到81％。这项研究表明，预处理可以改善OSPW对NF和RO膜的脱盐能力。

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