反渗透海水淡化预处理工艺

发布时间：2018-01-04 17:29

本文关键词：反渗透海水淡化预处理工艺　出处：《化工进展》2016年11期 　论文类型：期刊论文

【摘要】：对不同海水预处理工艺进行了研究,对比分析了不同工艺产水浊度、化学需氧量(COD_(Mn))、污染密度指数(SDI15)等参数及不同预处理工艺对超滤膜膜比通量的影响。混凝-沉淀或气浮处理能够有效降低海水浊度,配合砂滤或纤维过滤,浊度可以降低到0.3NTU左右。当超滤处理海水时,无论采用何种预处理方法,其产水浊度和SDI15都可以满足反渗透进水要求。直接超滤时,COD_(Mn)去除效果较差,超滤结合混凝-沉淀或气浮处理时,COD_(Mn)去除率有了较大的提高。预处理方法对超滤膜膜比通量影响较大,直接采用超滤进行处理时,超滤膜膜比通量衰减较快,经混凝-沉淀或气浮处理后,膜比通量衰减有所减缓,进一步经砂滤或纤维过滤后,膜比通量的衰减得到了较好的控制。采用混凝-沉淀/纤维过滤预处理工艺时超滤膜膜比通量衰减最低。
[Abstract]:For different seawater pretreatment were studied. The comparative analysis of the different process of producing water turbidity, chemical oxygen demand (COD_ (Mn)), the pollution density index (SDI15) and other parameters and different pretreatment on UF membrane specific flux. The effect of coagulation sedimentation or flotation treatment can effectively reduce the turbidity of sea water with sand filtration, or fiber filtration, the turbidity can be reduced to about 0.3NTU. When ultrafiltration seawater, regardless of the pretreatment method, the water turbidity and SDI15 can meet the requirements of reverse osmosis water. Direct ultrafiltration, COD_ (Mn) removal is poor, ultrafiltration combined with coagulation sedimentation or flotation process COD_ (Mn), the removal rate is greatly improved. The pretreatment methods of ultrafiltration membrane specific flux is affected directly by ultrafiltration treatment, ultrafiltration membrane specific flux attenuation, by coagulation and sedimentation or flotation treatment, membrane specific flux decay The attenuation of membrane flux is better after sand filtration or fiber filtration. When the coagulation precipitation / fiber filtration pretreatment process is used, the specific flux of ultrafiltration membrane is the lowest.

【作者单位】：天津大学化工学院天津市膜科学与海水淡化技术重点实验室;
【分类号】：P747+.5
【正文快照】： 21世纪水资源变得日益紧张,海水淡化作为现有水源有效补充手段,半个多世纪以来得到了迅速发展[1]。截至2014年全球海水淡化产能约为8520×104m3/d[2],我国海水淡化总量达到了日产94.21×104m3的规模[3],一定程度上缓解了沿海地区和岛屿居民生活用水以及工业用水紧张的局面。反

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