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首页> 外文会议>2011 Membrane technology conference amp; exposition. >Fouling Characterization of Ultrafiltration Ceramic Membranes with Model Solutions: Surface Characterization and Solute Rejection
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Fouling Characterization of Ultrafiltration Ceramic Membranes with Model Solutions: Surface Characterization and Solute Rejection

机译：使用模型解决方案的超滤陶瓷膜的结垢特性：表面特性和溶质排斥

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Ceramic ultrafiltration membrane experiments were performed using model solutions,rnwhich were representative of polymeric membrane foulants in drinking water treatmentrnapplications. Alginate and bovine serum albumin were used to represent biopolymers,rnsilica to represent an inorganic colloid, and Aldrich humic acid was used to represent arnnatural organic matter fraction. Solutions were filtered at constant pressure in all possiblerncombinations through a 300 kDa flat sheet ceramic membrane over one hour and fluxrndecline curves were monitored. Silica significantly increased the rate of flux decline,rnhowever, the majority of it was generally recovered with a hydraulic backwash.rnConversely, humic acid and BSA showed lower rates of flux decline, but most of the fluxrncould not be recovered with a backwash pointing to significant and almost completernhydraulically irreversible fouling. The contact angle was also measured to assess thernhydrophobicity of the virgin and fouled membranes. As expected the virgin contact anglernwas very hydrophilic and the only foulant that substantially increased the contact anglernwas BSA. Nevertheless, the addition of silica allowed the membrane surface to remainrnrelatively hydrophilic. Despite similar average sizes of BSA and humic acid, the rejectionrnof BSA was highest, possibly due to the potential for BSA to aggregate. The rejection forrnmixtures with BSA tended to be higher, but in the presence of silica rejection generallyrndecreased.
机译：使用模型溶液进行陶瓷超滤膜实验，该溶液代表了饮用水处理中聚合物膜污垢的代表。用藻酸盐和牛血清白蛋白代表生物聚合物，用二氧化硅代表无机胶体，用奥尔德里奇腐殖酸代表非天然有机物组分。在一小时内，通过300 kDa平板陶瓷膜在所有可能的组合中以恒定压力过滤溶液，并监测通量下降曲线。二氧化硅显着提高了助焊剂下降的速率，但是，通常通过液压反冲洗可回收大部分硅。相反，腐殖酸和BSA的助焊剂下降速率较低，但大多数助熔剂无法通过反洗回收，这表明和几乎完全的液压不可逆结垢。还测量了接触角以评估原始膜和结垢膜的疏水性。如所期望的，原始接触角是非常亲水的，并且实质上增加接触角的唯一污垢是BSA。然而，二氧化硅的加入使膜表面保持相对亲水。尽管牛血清白蛋白和腐殖酸的平均粒径相似，但排斥性牛血清白蛋白最高，这可能是由于牛血清白蛋白有可能聚集。与BSA的排斥混合物趋向于更高，但在存在二氧化硅排斥的情况下，通常会降低。

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