磁性离子交换树脂对原水中有机物去除效能的研究

采用磁性离子交换树脂(MIEX)预处理原水中有机物的中试试验结果表明,MIEX技术可有效地去除原水中的有机物,对UV254,DOC和CODMn的去除率分别稳定在82%、66%和50%,MIEX预处理可以有效强化混凝沉淀对有机物、藻细胞和浊度的去除.与常规工艺相比,在混凝剂聚合氯化铝投加量降低56%时,该工艺对UV254和CODMn的去除率分别为90%和71%,对藻细胞数和浊度的去除率分别为99%和95%.对溶解性有机物分级和分子量分布的测定表明,MIEX预处理主要去除混凝沉淀无法有效去除的小分子区间的亲水性和疏水性有机物,可以有效控制消毒副产物的产生,MIEX预处理与混凝沉淀联用工艺出水的三卤甲烷生成势(THMFP)和卤乙酸生成势(HAAFP)比原水降低了88%和87%.

Removal efficiency of organic matter in raw water with a magnetic ion exchange resin

A pilot-scale experiment was employed to evaluate a magnetic ion exchange resin for the removal of organics from raw water. Treatment with the magnetic ion exchange resin (MIEX) was effective in removing organic carbon. 82% UV254, 66%DOC and 50%CODMn removals were obtained respectively by the use of MIEX alone. Combination of MIEX and coagulation-settlement process enhanced removal of organics, algae and turbidity.90% UV254, 71%CODMn and 99% algae cells were removed by the combined process. Using MIEX as a pre-treatment before coagulation could reduce 56% PAC demand. Fractionation and molecular weight distribution were also investigated. MIEX process was shown to be effective in removing both hydrophobic and hydrophilic DOC, while conventional process could only remove hydrophobic DOC. MIEX process was highly effective at removing small molecular weight organics and coagulation was shown to preferentially remove large molecular weight organics. MIEX process followed by coagulation could reduce 88%THMFP and 87%HAAFP.