本研究以粉末活性炭吸附剂作为对照，探究了水铁矿吸附溶解性 有机物和减轻超滤膜污染的机理。通过吸附试验得出，水铁矿吸附剂 无论是从吸附容量上还是吸附速率上都要比粉末活性炭吸附有机物 效果好，并且吸附水中总溶解性有机物达 77.8%，吸附去除 UV 254 则 高达 88.9%。将超滤与水铁矿相结合时，水中溶解性有机物大大较少， 去除 UV 254 时高达 80%-95%。加入吸附剂后跨膜压差明显下降，直接 证明了吸附工艺能减轻超滤膜污染，并且水铁矿效果更佳。将膜阻力 分为外部阻力、内部可逆阻力和内部不可逆阻力，来进一步分析膜污 染。粉末活性炭主要依靠吸附小分子有机物来减轻超滤膜污染，而水 铁矿可通过吸附各种分子量的有机物，尤其较大分子有机物来降低超 滤膜污染。

In this study, powdered activated carbon adsorbent was used as a control to explore the mechanism of adsorption of dissolved organics and reduction of ultrafiltration membrane contamination by ferrihydrite. Adsorption experiments showed that the adsorbent of ferrihydrite was better than powdered activated carbon for adsorption of organic matter both in terms of adsorption capacity and adsorption rate, and the total soluble organic matter in water was 77.8%, and the removal of UV 254 by adsorption was as high as 88.9%. When ultrafiltration is combined with ferrihydrite, the amount of dissolved organic matter in the water is much less, which is as high as 80% to 95% when UV 254 is removed. The significant decrease in transmembrane pressure after the addition of the adsorbent directly proves that the adsorption process can reduce the pollution of the ultrafiltration membrane and the ferrihydrite effect is better. Membrane resistance can be divided into external, internal resistance and internal irreversible reversible drag further analysis of powder activated carbon rely mainly on small molecules adsorbed organic matter to alleviate ultrafiltration membrane fouling, the water of iron ore by the adsorption of various molecular weight organic matter, especially big molecular organic matter to reduce the pollution of the ultrafiltration membrane.