高矿化度电子废水MBR处理产水的污染特性

Fouling propensity of effluent from the MBR system for the electronics wastewater with high salinity

对于高矿化度电子废水的膜法深度处理,明确MBR(膜生物反应器)产水的污染特性,是整个MBR-RO(反渗透)膜系统设计和长期稳定运行的关键.本文基于三维荧光光谱和扫描电镜等技术,对电子废水MBR处理产水的水质、沉降性能及对RO膜的污染进行研究.结果发现,产水中的有机物尽管含量少,但有较强的黏附作用;水中的金属离子不仅与大分子富里酸及部分蛋白质发生络合,还可能与硅基类胶体存在一定作用,它们一起在RO膜表面形成了质地致密的污染层.MBR产水在进入RO处理系统之前,可以通过提高水体pH,将其中的有机物和大部分无机物以絮体沉淀形式去除,从而减缓膜污染的形成.另外,有效除去金属离子是保证污染后RO膜清洗效率的关键.

It＇s important to delermin the fouling properties of the effluent from the membrane bioreactor （MBR） system for the design and long-term operational sustainability of the MBR-Reverse Osmosis（RO） system treating electronics wastewater with high salinity. In this paper, the effluent quality, settling performance and membrane fouling were researched with three dimension excitation-emission fluorescence spectra （EEM）, scanning electron microscope（SEM） and energy dispersive spectrometer（EDS）. The results showed that there was a few organics with a strong adhesion in the effluent. The metal ions in the effluent not only had a complexation reaction with the macromolecules fulvic acid and protein, but also Rreacted with silicon colloid. It caused a compacts structure fouling layer on the RO membrane surface. But the organics and most of inorganics could form settling of flocs and be removed from the effluent by increasing pH of the effluent, which would relieve the membrane fouling. In addition, the removal of metal ions in the fouling layer was critical for enhancing the cleaning efficiency of RO membrane.