不同预处理对超滤膜去除有机物效果的影响

通过中试考察了砂滤、纤维过滤、混凝-砂滤以及混凝-纤维过滤预处理与超滤膜工艺联用对受污染水中波长为254nm的紫外吸光度A_(254)和DOC的去除效果,并与直接膜滤工艺进行比较,探讨不同预处理对超滤膜去除有机物效果的影响.结果表明,几种预处理均可明显改善超滤膜去除有机物效果,与直接膜滤相比,采用砂滤、纤维过滤、混凝-砂滤以及混凝-纤维过滤预处理,可使超滤膜出水中A_(254)的平均去除率分别提高16、7、23及14个百分点。对DOC的平均去除率分别提高17、14、27及19个百分点,其中混凝-砂滤-膜滤工艺在去除有机物的效果和稳定性方面都优于其他工艺,采用混凝-砂滤作为超滤膜工艺的预处理方式对提高膜处理效率及防止膜污染是非常有效的.

Influence on Organics Removal Effect of Ultrafiltration by Various Pretreatment Process

Removal effects of DOC and A_(254) are investigated with pretreatment processes of sand filtration, fibrous filtration,coagulation-sand filtration and coagulation-fibrous filtration combined with ultrafiltration, compared with direct ultrafiltration under pilot scale.Influence of organic matter removal of ultrafiltration is probed by various pretreatment processes.Results show that effects of organic matter removal can be enhanced by the pretreatment processes.A_(254) removal rate of ultrafiltration outlet is raised 16,7,23 and 14 percentage points and DOC removal rate of ultrafiltration outlet is raised 17,14,27 and 19 percentage points,with pre- treatment of sand filtration,fibrous filtration,coagulation-sand filtration and coagulation-fibrous filtration, compared with direct ultrafiltration.The organic matter removal effect and stabilization of coagulation-sand filtration process is better than other process.It is highly effective to improve membrane treatment efficiency and membrane contamination protection apply DOC and A_(254) indexes of treated water by ultrafiltration are improved clearly.The best effect is achieved by coagulation-sand filtration process.The coagulation process is showed remarkable contribution to DOC and A_(254) removal.