预涂动态膜在乳化油废水处理中的阻力分布及其抗污染特性

为讨论预涂动态膜的抗污染特性,测定了陶瓷膜、高岭土预涂动态膜和高岭土/MnO2复合预涂动态膜分别在乳化油废水处理中的阻力分布,并用SEM扫描电镜对污染预涂动态膜形貌进行了表征。结果表明,乳化油污染阻力明显高于基膜(或陶瓷膜)固有阻力及涂膜粒子形成的阻力,乳化油对预涂动态膜或陶瓷膜的污染是导致膜通量衰减的主要原因;高岭土和复合预涂动态膜所用基膜污染阻力低于陶瓷膜的内部污染阻力,其中复合预涂动态膜所用基膜的污染阻力最小;复合动态膜层比高岭土动态膜层的污染程度低;污染预涂动态膜表面呈现明显的凝胶态物质,其基膜外壁面未呈现凝胶态物质。处理乳化油废水中,动态膜层可有效保护基膜,表现出了较强的抗污染性能。

Resistance distribution and anti-fouling characteristics of precoating dynamic membrane in emulsified oily wastewater treatment

In order to discuss the anti-fouling characteristics of the precoating dynamic membrane, the resistance distributions of the ceramic membrane, kaolin precoating dynamic membrane and kaolin/MnO₂ composite precoating dynamic membrane were determined in emulsified oily wastewater treatment. The characterizations of the topography of the polluted precoating dynamic membranes were scanned by the SEM. The results showed that the fouling resistances caused by emulsified oil were obviously higher than the support (ceramic membrane) resistance or the resistance caused by coating particles. The membrane flux reduction was mainly due to the fouling effect by emulsified oil. The support fouling resistances of the precoating dynamic membranes were lower than the internal fouling resistance in ceramic membrane.The support fouling resistance in composite precoating dynamic membrane was the lowest. The composite dynamic layer was less polluted than the kaolin dynamic layer. For the precoating dynamic membranes, there presented clear colloidal materials on the surface, and no colloidal materials appeared on the outer wall surface of the supports. The dynamic layer can effectively protect the support in wastewater treatment, which shows very good anti-fouling characteristics.