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利用烧杯试验研究了磁性离子交换树脂(magnetic ion exchange resin,MIEX)预处理对长江原水中有机物的去除效能,以总溶解有机碳(DOC)2、54 nm紫外吸收值(UV254)、有机物相对分子质量分布、有机物分级、紫外扫描以及消毒副产物生成量等指标进行表征.结果表明,长江水源水中的有机物主要为小分子亲水性有机物,其含量占有机物总量的50%以上;MIEX预处理可以有效降低水中有机物的含量,投加量为10 mL/L、接触时间为15 min时,DOC的去除率超过35%,相对分子质量和分级的测定结果表明,小分子亲水性部分有机物的去除导致了DOC去除效果的改善;从紫外扫描结果可看出,MIEX预处理对在190~250 nm波长时有强吸收的有机物去除效果非常明显,但对在高于250 nm波长处有吸收的有机物去除效果与混凝阶段的效果相近.
The effect of magnetic ion exchange resin (MIEX) pretreatment on the removal of organic matter in the Yangtze River was studied by using a beaker. The total dissolved organic carbon (DOC) at 254 nm, UV254, The results showed that the organic matter in the Yangtze River water was mainly composed of small molecule hydrophilic organics, accounting for more than 50% of the total organic matter. The MIEX pretreatment Can effectively reduce the content of organic matter in water. When the dosage is 10 mL / L and the contact time is 15 min, the removal rate of DOC is more than 35%. The determination results of relative molecular mass and classification show that the small molecule hydrophilic organic compounds Removal led to the improvement of DOC removal efficiency. It can be seen from the results of UV scanning that the removal efficiency of MIEX pretreatment on organic matter with strong absorption at 190 ~ 250 nm is very obvious. However, for the removal of organic matter at wavelengths higher than 250 nm Removal of organic matter and the effect of the coagulation phase similar.