强化气浮法在膜法海水淡化预处理中去除藻类的应用

Application of Enhanced Air Flotation Method to Remove Algae in Membrane Desalination Pretreatment

针对目前膜法海水淡化工艺中,对藻类污染负面影响预计不足,导致藻类爆发时,反渗透膜污染严重的情况,提出使用特殊设计的强化气浮法作为反渗透膜的预处理工艺,经过改造后的预处理系统,微气泡体积浓度大幅提升,微气泡粒径更合理、分散能力更强,对藻类去除率普遍可达到99%以上,相对常规气浮方法有大幅提升。强化气浮预处理后的出水,使用抑藻剂进一步强化藻类的去除能力。优化设计的气浮工艺作为膜法海水淡化预处理技术具有广阔的应用前景。

At the conventional membrane desalination process, insufficient investigations were carried on the negative impact of algae pollution on the desalination results. A serious situation of reverse osmosis membrane pollution occurs when algae outbreaks. A specially designed enhanced air flotation process is used as a pretreatment process for the reverse osmosis membrane. After the pretreatment system, the volume concentration of microbubbles has been greatly increased, the microbubble particle size is more reasonable, and the dispersion ability is stronger. The algae removal rate can generally reach more than 99%, which is greatly improved compared with the conventional air flotation process. The effluent after air flotation pretreatment is strengthened, and the algae removal ability is further enhanced by using an algicide. The optimally designed air flotation process has broad application prospects as a membrane desalination pretreatment technology.