吸附预处理减缓微滤膜污染试验研究

Study of effect of adsorption pretreatment on mitigating fouling of micromembrane

摘要:

聚醚砜(PES)微滤膜过滤厌氧-缺氧-好氧生物脱氮除磷工艺(A2O)出水时，膜污染较严重. 废水经过硅藻土、活性白土和活性炭三种吸附剂处理后，膜通量得到明显的改善. 吸附预处理减缓膜污染的效果优劣排序：活性炭＞活性白土＞硅藻土. 扫描电镜图显示，废水经过吸附预处理后，膜表面不存在污垢层，这是膜通量得以改善的主要原因.

Abstract:

The most serious fouling is observed when the microfiltration of the A2O wastewater without the pretreatment. The flux is significantly improved by the adsorption pretreatment of diatomite, floridin and activated carbon. The improvement degree is as the following order: activated carbon>floridin> diatomite. As shown in the SEM pictures, a cake layer is found on the membrane used for the wastewater without pretreatment, while the cake layer is not found on the membrane used for the wastewater with pretreatment. Therefore, the dominant reason of the less fouling is the less adsorption of the foulants on the membrane surface.