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Alginate to simulate biofouling in submerged fluidized ceramic membrane reactor: Effect of solution pH and ionic strength
Bioresource Technology ( IF 9.7 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.biortech.2020.122813 Hyemin Lee 1 , Rizwan Ahmad 2 , Jeonghwan Kim 1
Bioresource Technology ( IF 9.7 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.biortech.2020.122813 Hyemin Lee 1 , Rizwan Ahmad 2 , Jeonghwan Kim 1
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Membrane fouling was investigated experimentally by fluidizing non-adsorbed plastic scouring media on flat-tubular ceramic membrane treating a sodium alginate solution as a representative of polysaccharides in wastewater. Fouling rate increased with set-point permeate flux, but it was remarkably reduced by fluidizing the scouring agent regardless of the flux applied. Higher solution pH resulted in more reduction in membrane fouling due to electrostatic repulsion enhanced between alginate foulant and membrane surface which are both negatively charged. The addition of divalent cations such as Ca and Cu mitigated alginate fouling significantly due to the back transport associated with formation of larger particles away from membrane. However, the addition of monovalent cations accelerated the membrane fouling with less effectiveness of the media fluidization in fluidized bed membrane reactor. Adding monovalent ions was thought to transform rigid, compact and spherocolloidal macromolecular structure of alginate into the intramolecular charge shielding to neutralize functional groups.
中文翻译：
海藻酸盐模拟浸没式流化陶瓷膜反应器中的生物污垢：溶液 pH 值和离子强度的影响
通过在平管陶瓷膜上流化非吸附塑料冲刷介质，处理作为废水中多糖代表的海藻酸钠溶液，对膜污染进行了实验研究。结垢率随着设定点渗透通量的增加而增加，但通过流化精练剂，结垢率会显着降低，而与所使用的通量无关。由于藻酸盐污垢和带负电的膜表面之间的静电斥力增强，溶液 pH 值越高，膜污垢的减少就越多。添加二价阳离子（例如 Ca 和 Cu）可显着减轻藻酸盐污染，因为与远离膜的较大颗粒的形成相关的反向传输。然而，单价阳离子的添加加速了膜污染，降低了流化床膜反应器中介质流化的效率。添加一价离子被认为可以将海藻酸盐刚性、致密、球状胶体的大分子结构转变为分子内电荷屏蔽，从而中和官能团。
更新日期：2020-01-15
中文翻译：
海藻酸盐模拟浸没式流化陶瓷膜反应器中的生物污垢：溶液 pH 值和离子强度的影响
通过在平管陶瓷膜上流化非吸附塑料冲刷介质，处理作为废水中多糖代表的海藻酸钠溶液，对膜污染进行了实验研究。结垢率随着设定点渗透通量的增加而增加，但通过流化精练剂，结垢率会显着降低，而与所使用的通量无关。由于藻酸盐污垢和带负电的膜表面之间的静电斥力增强，溶液 pH 值越高，膜污垢的减少就越多。添加二价阳离子（例如 Ca 和 Cu）可显着减轻藻酸盐污染，因为与远离膜的较大颗粒的形成相关的反向传输。然而，单价阳离子的添加加速了膜污染，降低了流化床膜反应器中介质流化的效率。添加一价离子被认为可以将海藻酸盐刚性、致密、球状胶体的大分子结构转变为分子内电荷屏蔽，从而中和官能团。
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