超滤膜在临界通量以下过滤可不产生膜污染或产生极轻的膜污染,针对超滤膜在饮用水处理中的临界通量的影响因素,系统考察曝气、过滤方式和混凝沉淀预处理等对浸没式超滤膜处理松花江水临界通量的影响.结果表明,曝气强度达到10 m3/(m2·h),连续曝气可将超滤膜的临界通量提高5 L/(m2·h),曝气强度达到40 m3/(m2·h),间歇曝气可将超滤膜的临界通量提高5 L/(m2·h),但曝气强度再增大不会继续提高临界通量;间歇过滤不能提高超滤膜的临界通量,曝气强度为40m3(m2·h)时,间歇过滤间歇曝气可将其临界通量提高5 L/(m2·h)；混凝沉淀预处理可将超滤膜的临界通量提高10 L/(m2·h)、混凝-连续曝气和混凝-间歇过滤间歇曝气可将临界通量提高15 L/(m2·h).%No fouling or very little fouling would be caused by the filtration of ultrafiltration membrane under the critical flux. According to the factors affecting the critical flux of ultrafiltration membrane in drinking water treatment, the effects of aeration, filtration mode, coagulation sedimentation pretreatment and some other factors on the critical flux of the submerged ultrafiltration membrane in treatment of water from Songhua River were investigated. The results showed that, critical flux could be enhanced by 5 L/(m·2h) under continuousaeration with the intensity of 10 m3/(m2·h), and the same effect could also be obtained under intermittentaeration with the intensity of 40 m3/(m2·h), however, after that, the critical flux could no longer be increased by increasing aeration intensity. Intermittent filtration had no positive effect on critical flux, when the aeration intensity was 40 mV(m2·h), intermittent filtration with intermittent aeration could enhance the critical flux by 5 L/(m2·h). Critical flux could be enhanced by 10 L/(m2·h) when using coagulation sedimentation pretreatment, and be enhanced by 15 L/(m2·h) when using combined process of coagulation-continuous aeration and coagulation-intermittent filtration and intermittent aeration.
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