在线混凝/超滤处理太湖水的试验研究

Treatment of Taihu Lake Water by On-line Coagulation/Ultrafiltration

超滤试验以太湖水为原水,采用在线混凝/超滤(CUF)和直接超滤(UF)并行的运行方式,通量设置为75~90 L/(m^2·h),分析跨膜压差(TMP)的变化,考察对有机物和藻类的去除效果。试验结果表明,CUF和UF都能在高通量下稳定运行,TMP均不超过30 kPa,且CUF可以有效降低TMP;超滤去除溶解性有机物的能力较弱,混凝增加了其对小分子有机物的去除效果;超滤能很好地去除藻蓝蛋白和硅藻,去除率分别在88. 90%和82. 58%以上,混凝可以强化超滤对硅藻的去除,但对于藻蓝蛋白却相反。

Taihu Lake water was treated in an ultrafiltration test,and the on-line coagulation/ultrafiltration (CUF) and direct ultra filtration (UF) were operated in parallel. The flux was set at 75-90 L/(m^2·h),changes of transmembrane pressure difference (TMP) were analyzed,and the removal effect of organic matter and algae was investigated. The results showed that both CUF and UF could operate steadily under high flux,and both the TMPs were less than 30 kPa. It was found that the on-line coagulation/ultrafiltration could effectively reduce TMP. The ability of ultrafiltration to remove dissolved organics was weak, and coagulation increased its removal effect on small molecular organics.Ultrafiltration had good removal effect on phycocyanin and diatoms,and the removal rates were higher than 88. 90% and 82. 58% respectively. Coagulation enhanced the removal of diatoms by ultrafiltration,but it had the opposite effect for phycocyanin removal.