Effects of chlorination on assimilable organic carbon in drinking water
WU Wei-wei1, CHEN Jia-pei1, DONG Bing-zhi2
1. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
2. Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China
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.
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