Effects of ionic strength on membrane fouling in a membrane bioreactor.
Effects of ionic strength on membrane fouling in a membrane bioreactor.
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DOI：
10.1016/j.biortech.2014.01.014
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发表时间：
2014-03
影响因子：
11.4
通讯作者：
F. Wang;Meijia Zhang;Wei Peng;Yiming He;Hongjun Lin;Jianrong Chen;H. Hong;Ai-Jun Wang;Haiying Y
中科院分区：
文献类型：
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作者：
F. Wang;Meijia Zhang;Wei Peng;Yiming He;Hongjun Lin;Jianrong Chen;H. Hong;Ai-Jun Wang;Haiying Y
研究了离子强度对膜生物反应器（MBR）膜污染的影响。在0.005- 0.05mol/L范围内，离子强度对膜阻力、污染膜阻力和膜孔堵塞无明显影响。热力学分析表明，在污泥絮体向膜表面靠近的过程中，存在一个二次能量极小值和一个能垒。离子强度的增加可以显著降低能垒。结果表明，存在一个临界离子强度，高于此值，能垒消失，有利于污垢的粘附。滤饼阻力受离子强度的影响不显著，但高度依赖于上清液中的SMP。SMP引起的高滤饼阻力可以用渗透压机理来解释。所得结果为膜生物反应器中膜污染的研究提供了新的思路。
In this study, the effects of ionic strength on membrane fouling in a membrane bioreactor (MBR) were investigated. Ionic strength in range of 0.005–0.05 mol/L exerted no apparent impacts on the resistance of virgin membrane, fouled membrane and pore clogging. Thermodynamic analysis showed existences of a secondary energy minimum and an energy barrier in the process of the sludge flocs approaching to membrane surface. Increase in ionic strength could significantly reduce the energy barrier. It was revealed that there existed a critical ionic strength above that the energy barrier would disappear, facilitating adhesion of the foulants. Cake resistance was not significantly affected by the ionic strength, but highly depended on SMP in supernatant. The high cake resistance caused by SMP could be explained by the osmotic pressure mechanism. The obtained results provided new insights into membrane fouling in MBRs.