College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China.
Department of Materials Physics, Zhejiang Normal University, Jinhua 321004, China.
Bioresour Technol. 2018 Jun;257:39-46. doi: 10.1016/j.biortech.2018.02.067. Epub 2018 Feb 16.
In this study, mechanisms and roles of gel elasticity in extremely high specific filtration resistance (SFR) were investigated. It was found that, as compared with cake layer in a membrane bioreactor (MBR), real gel layer in the MBR and agar gel possessed extremely high SFR. Foulant characterization showed that foulants were easy to bind water, and agar gel possessed a network structure. Mechanisms based on Flory-Huggins and Flory-Rehner models were deduced to describe the high SFR of agar gel. Model simulation showed that sum of SFR induced by the mixing chemical potential and the elastic chemical potential change is close to that of the agar gel, suggesting feasibility of the deduced models. Gel elasticity accounted for about 13% of total SFR of agar gel under conditions in this study. This study satisfactorily explained the extremely high SFR of gel, and addressed roles of gel elasticity in gel SFR.
本研究探讨了凝胶弹性在极高比过滤阻力（SFR）中的机制和作用。研究发现，与膜生物反应器（MBR）中的滤饼层相比，MBR 中的真实凝胶层和琼脂凝胶具有极高的 SFR。污染物特性表明，污染物易于结合水，且琼脂凝胶具有网络结构。基于 Flory-Huggins 和 Flory-Rehner 模型的机理被推导出来，以描述琼脂凝胶的高 SFR。模型模拟表明，混合化学势和弹性化学势变化引起的 SFR 之和接近于琼脂凝胶的 SFR，表明推导模型的可行性。在本研究条件下，凝胶弹性约占琼脂凝胶总 SFR 的 13%。该研究对凝胶的极高 SFR 进行了合理的解释，并阐明了凝胶弹性在凝胶 SFR 中的作用。
