臭氧-生物活性炭对有机物分子量分布的影响

Influence of ozonation/BAC process on molecular weight distribution of organic matter

测定了南方某水厂中试规模的臭氧-生物活性炭工艺不同处理阶段(原水、沉淀水、砂滤水、臭氧化水、生物活性炭出水)有机物(TOC和UV254)的分子量(MW)分布.分析了原水中生物可同化有机碳(AOC)的分子量分布.结果表明,AOC主要属于天然有机物(NOM)中MW<1kDa的部分.MW<1kDa的部分占可溶解性有机碳(DOC)的53%～67%,而AOC只占DOC的2.65%～5.91%,表明去除大部分DOC的臭氧-生物活性炭工艺并不能有效去除AOC.

Molecular weight （MW） distribution of organic matter （measured as TOC and UV254） was measured in a pilot-scale filter of an ozonation/BAC （biological activated carbon） process in a water treatment plant in South China on different samples： raw water, water samples after sedimentation, sand filtration, ozonation and BAC filtration. MW distribution of assimilable organic carbon （AOC） in raw water was studied. AOC was mainly related to natural organic carbon （NOM） with MW 〈1 kDa （1000 dalton）. The fraction of the NOM with MW 〈1 kDa occupied 53%-67% of dissolved organic carbon （DOC） while AOC occupied only 2.65%-5.91% of DOC. Ozonation/BAC process removing a large part of DOC would not necessarily result in a reduction in AOC.