Australian Water Quality Centre, South Australian Water Corporation, GPO Box 1751, Adelaide SA 5001, Australia.
Water Res. 2011 Feb;45(4):1539-48. doi: 10.1016/j.watres.2010.11.024. Epub 2010 Nov 24.
Removal of natural organic matter (NOM) is a key requirement to improve drinking water quality. This study compared the removal of NOM with, and without, the patented magnetic ion exchange process for removal of dissolved organic carbon (MIEX DOC) as a pre-treatment to microfiltration or conventional coagulation treatment over a 2 year period. A range of techniques were used to characterise the NOM of the raw and treated waters. MIEX pre-treatment produced water with lower concentration of dissolved organic carbon (DOC) and lower specific UV absorbance (SUVA). The processes incorporating MIEX also produced more consistent water quality and were less affected by changes in the concentration and character of the raw water DOC. The very hydrophobic acid fraction (VHA) was the dominant NOM component in the raw water and was best removed by MIEX pre-treatment, regardless of the raw water VHA concentration. MIEX pre-treatment also produced water with lower weight average apparent molecular weight (AMW) and with the greatest reduction in complexity and range of NOM. A strong correlation was found between the VHA content and weight average AMW confirming that the VHA fraction was a major component of the NOM for both the raw water and treated waters.
去除天然有机物 (NOM) 是改善饮用水质量的关键要求。本研究在两年的时间内比较了专利的磁离子交换去除溶解有机碳（MIEXDOC）预处理与微滤或常规混凝处理去除 NOM 的效果。采用了一系列技术来对原水和处理水的 NOM 进行特性描述。MIEX 预处理使水中的溶解有机碳（DOC）和特定紫外吸光度（SUVA）浓度降低。包含 MIEX 的工艺还产生了更一致的水质，并且受原水 DOC 浓度和特性变化的影响较小。非常疏水的酸部分（VHA）是原水中占主导地位的 NOM 成分，无论原水 VHA 浓度如何，MIEX 预处理都能很好地去除。MIEX 预处理还产生了水中的低重量平均表观分子量（AMW）和复杂性和 NOM 范围的最大降低。发现 VHA 含量与重量平均 AMW 之间存在很强的相关性，这证实了 VHA 部分是原水和处理水中 NOM 的主要成分。
