Molecular weight distribution and removal characters of DOM in the typical source water in south of China
典型南方水源溶解性有机物分子量分布变化及去除特性

The apparent molecular-weight (MW) distribution of dissolved organic matter (DOM) in Shenzhen reservoir supplied by Dongjiang river was studied by ultra-filtration method. And the variety of apparent MW of the DOM and the relationship between apparent MW and trihalomethane formation potential (THMFP) were also investigated with the water samples during the period from March 2005 to September 2005. As showed in the results, the an apparent MW lower than 1kDa had the largest ratio in the total DOC (dissolved organic carbon) of the water, with the medial value of 41.15%, where the average percentage of THMFP is 32.23%. Whereas the conventional and advanced treatment processes cannot remove the organics effectively. The ratio of the organics with an apparent MW in 10k-30kDa was 24.07% in the total DOC, and an average 29.09% in which was the total THMFP. The conventional processes can remove these organics effectively.