a State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering , Tongji University , Shanghai , PR China.
Biofouling. 2014;30(5):571-8. doi: 10.1080/08927014.2014.905546. Epub 2014 Apr 10.
The effects of Ca(II) on the structure of the cake layer in submerged membrane bioreactors (SMBRs) were investigated in this study. Three parallel laboratory-scale SMBRs were operated with synthetic municipal wastewater with three Ca(II) levels (82, 208 and 410 mg l(-1)). As the Ca(II) concentration increased, the sludge floc size increased and the molecular weight of the soluble microbial products (SMP) in the bulk liquid decreased. These observations were attributed to the neutralization and bridging function of Ca(II). Furthermore, Ca(II) addition did not change the thickness of the cake layer, but inhibited the deposition of other elements, such as Al, Si, Mg, and Fe. As a result of Ca(II) addition, the cake layer became less compact and more porous. The interspaces among the flocs in the cake layer helped to reduce the membrane fouling potential.
本研究考察了 Ca(II) 对浸没式膜生物反应器 (SMBR) 中 Cake 层结构的影响。采用三种不同 Ca(II) 浓度（82、208 和 410mg/L）的合成城市污水，平行运行了三个实验室规模的 SMBR。随着 Ca(II) 浓度的增加，污泥絮体粒径增大，而主体液相中可溶性微生物产物（SMP）的分子量降低。这些现象归因于 Ca(II) 的中和桥联作用。此外，Ca(II) 的添加并没有改变 Cake 层的厚度，但是抑制了其他元素（如 Al、Si、Mg 和 Fe）的沉积。由于 Ca(II) 的添加，Cake 层变得不那么致密，更加多孔。Cake 层中絮体之间的空隙有助于降低膜污染的潜力。
