氯对饮用水中可同化有机碳的影响

通过分析太湖水的分子量分布变化以及亲疏组分,考察氯反应生成AOC的效果和机理.结果表明,弱疏组分的AOC生成量最大,其次为强疏,中亲和带负电亲水的生成量最少.氯主要与小分子的疏水性有机物反应,AOC的生成量最多.通过考察深度处理工艺的有机物分子量以及组分的变化,发现疏水性有机物呈逐渐下降而亲水性组分呈上升的趋势,表明氯化产生的AOC呈减少趋势.小分子的疏水性有机物是主要的氯化AOC的前体物.

Effects of chlorination on assimilable organic carbon in drinking water

The formation and mechanism of assimilable organic carbon(AOC) production after chlorination is evaluated through analyzing variation of molecular weight(MW) distribution and hydrophobic/hydrophilic fractions. The experimental results showed that the hydrophobic part of AOC was dominant, followed by transphilic and neutral hydrophilic fractions. The charged hydrophilic fraction was the least. It was found that chlorine reacted mainly with hydrophobic organics with low MW, leading to the most AOC formation. By investigating the variations of organics of MW and fractions through advanced treatment process, it was found that hydrophobic fraction was reduced and hydrophilic fraction was increased gradually, indicating the decrease of AOC formation after chlorination. It can be concluded that hydrophobic organics with low MW is the main precursor of AOC after chlorination.