Effects of operating conditions on biofouling in crossflow ultrafiltration membrane processes
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Effects of operating conditions on biofouling in crossflow ultrafiltration membrane processes

机译：经运行条件对跨流超滤膜工艺生物污染的影响

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Highlights?Biofouling behavior in ultrafiltration membrane processes was evaluated.?Crossflow filtration system was designed for biofouling evaluation.?Changes in water flux and biofilm thickness were evaluated.AbstractWe evaluated the effects of operating conditions on the biofouling behaviors in ultrafiltration (UF) membrane processes with respect to biofilm formation and decrease in permeate flux. The biofouling experiment was performed by filtering nutrient-containing feed water with a crossflow membrane cell through a regenerated cellulose UF membrane consisting of pre-adhered bacteria. The nutrient concentration, initial permeate flux, flow rate of feed water, and trans-membrane pressure (TMP) were controlled as the operating conditions. The permeate flux was monitored during the filtration, and the adhesion of bacteria and extracellular polymeric substances (EPS) to the membrane surfaces was observed using confocal laser scanning microscope. The increase in the medium concentration and initial permeate flux facilitated both the decline of the permeate flux and the biofilm formation by causing concentration polarization of the medium. The TMP and flow rate of the feed water also affected the permeate flux and bacterial adhesion. The biofilm thickness on the membrane surface after the biofouling tests was positively related to the decline ratio of the permeate flux.]]>
机译：<！[cdata [ 亮点 ？ 评估超滤膜过程中的生物污垢行为。 ？ 跨流过滤系统被设计用于生物污染评估。< / ce：para> ？ 评估水通量和生物膜厚度的变化。 抽象 我们评估了在超滤（UF）膜过程中的生物耦合行为上的操作条件的影响生物膜形成和渗透助焊剂的降低。通过通过预生成的纤维素UF膜过滤含有含有含有营养的进料水来进行生物污垢实验，通过由预粘附的细菌组成的再生纤维素UF膜来进行。控制营养浓度，初始渗透通量，进料水流和跨膜压力（TMP）作为操作条件。在过滤期间监测渗透通量，使用共聚焦激光扫描显微镜观察细菌和细胞外聚合物物质（EPS）对膜表面的粘附性。培养基浓度和初始渗透通量的增加促进了通过引起培养基的浓度极化来促进渗透通量和生物膜形成的下降。进料水的TMP和流速也影响了渗透剂助焊剂和细菌粘附。膜表面上的生物膜厚度与渗透助焊剂的下降比呈正相关。 ]]>

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