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试验针对混凝-沉淀-再絮凝-超滤组合工艺对水中有机物的强化去除效果和膜污染的控制效能展开研究.结果表明:再絮凝-超滤组合工艺对有机物的单元去除率可达26%,远高于传统的超滤膜组合工艺;同时,该工艺对有机物的去除主要体现在对中性亲水性有机物和分子量分别大于10kDa和小于1kDa的有机物方面,与传统超滤膜工艺有较大区别.当采用硫酸铝作为再絮凝剂,其投加量达到6.0mg/L时,统一膜污染指数(UMFI)达到最小(0.061 3m2/L),表明再絮凝预处理工艺能够更为有效地控制超滤膜的污染.Zeta电位的测试结果表明:再絮凝过程可使沉后水中残余的胶体Zeta电位降至0,从而减轻了膜表面对污染物的吸附;而再絮凝过程中微小絮体的形成也使得沉后水中颗粒物粒径增大,防止了膜孔堵塞现象的发生并使得形成的滤饼层结构较为松散,从而取得良好的超滤膜污染控制效果.
The coagulation-sedimentation-re-coagulation-ultrafiltration combination process was used to study the enhanced removal efficiency of organic compounds in water and the control efficiency of membrane fouling.The results show that the unit removal rate of organic matter can reach 26% , Which is much higher than traditional ultrafiltration membrane combination process. Meanwhile, the process of organic removal is mainly reflected in the neutral hydrophilic organic matter and molecular weight greater than 10kDa and less than 1kDa organic matter, compared with the traditional ultrafiltration membrane process When using aluminum sulfate as re-flocculant, the uniform membrane fouling index (UMFI) reached the minimum (0.061 3m2 / L) when the dosage reached 6.0mg / L, indicating that the re-flocculation pretreatment process can be more effective Control the pollution of ultrafiltration membrane.Zeta potential test results show that: the re-flocculation process can make Shen Zuo water residual colloidal Zeta potential dropped to 0, thereby reducing the membrane surface adsorption of pollutants; and then flocculation process of small floc The formation of particles in the sediment also increases the particle size of the particles, preventing the clogging of the membrane pores and resulting in a loose filter cake structure, thereby achieving a good control effect of the ultrafiltration membrane pollution.