Department of Environmental Engineering, Inha University, Namgu Yonghyun Dong 253, Incheon, Republic of Korea.
Department of Environmental Engineering, Inha University, Namgu Yonghyun Dong 253, Incheon, Republic of Korea.
Chemosphere. 2018 Jan;191:136-144. doi: 10.1016/j.chemosphere.2017.09.135. Epub 2017 Sep 28.
A mathematical model has been developed to better understand fouling mitigation mechanisms in particle-sparged membrane bioreactor. The model developed herein assumes two fouling mechanisms, (i) the pore blocking leading to the decrease in membrane surface porosity and (ii) the progressive development of compressible cake layer on the membrane surface. The model has been validated by comparison with trans-membrane pressure data registered from the bioreactor filtering a synthetic solution consisting of bentonite, sodium alginate and bovin serum albumine (BSA). Two nonporous media have been tested, Polyethylene terephthalate (PET) beads and silica particles with different dosage (0, 10, 30, 50 and 70% (v/v)). Compared to the experimental data, the model shows satisfactory fitting with R ≥ 93%. For both media tested, an optimal dosage to minimize fouling rate was observed at 50% (v/v). Even if both fouling mechanisms have been mitigated by adding fluidized media, pore blocking was more pronounced than cake formation. Moreover, better pore blocking mitigation was observed with PET media (50% (v/v)) having bigger size and lower density than silica particles.
已经开发了一种数学模型来更好地理解颗粒曝气膜生物反应器中的防污机制。本文所开发的模型假设了两种防污机制，（i）导致膜表面孔隙率降低的孔阻塞，以及（ii）在膜表面上逐渐形成可压缩滤饼层。该模型通过与从过滤含有膨润土、海藻酸钠和牛血清白蛋白（BSA）的合成溶液的生物反应器中记录的跨膜压力数据进行比较得到了验证。已经测试了两种无孔介质，聚对苯二甲酸乙二醇酯（PET）珠和二氧化硅颗粒，剂量分别为 0、10、30、50 和 70%（v/v）。与实验数据相比，该模型的拟合度令人满意，R≥93%。对于测试的两种介质，在 50%（v/v）下观察到最小污垢速率的最佳剂量。即使通过添加流化介质减轻了两种防污机制，孔阻塞仍然比滤饼形成更为明显。此外，与具有更大尺寸和更低密度的二氧化硅颗粒相比，使用尺寸更大且密度更低的 PET 介质（50%（v/v））可以更好地减轻孔阻塞。
