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Size and resin fractionations of dissolved organic matter and trihalomethane precursors from four typical source waters in China

Author:
Wei, Qunshan, Wang, Dongsheng, Wei, Qia, Qiao, Chunguang, Shi, Baoyou, Tang, Hongxiao
Source:
Environmental monitoring and assessment 2008 v.141 no.1-3 pp. 347-357
ISSN:
0167-6369
Subject:
absorbance, adsorption, byproducts, cluster analysis, disinfection, dissolved organic matter, hydrophobicity, molecular weight, provenance, quality control, rivers, ultrafiltration, water quality, water treatment, China
Abstract:
Dissolved organic matter (DOM) and its potential to form disinfection by-products (DBPs) during drinking water treatment raise challenges to water quality control. Understanding both chemical and physical characteristics of DOM in source waters is key to better water treatment. In this study, the DOM from four typical source waters in China was fractionated by XAD resin adsorption (RA) and ultrafiltration (UF) techniques. The trihalomethane formation potential (THMFP) of all fractions in the DOM were investigated to reveal the major THM precursors. The fraction distributions of DOM could be related to their geographical origins in a certain extent. The dominant chemical fraction as THM precursors in the DOM from south waters (East-Lake reservoir in Shenzhen and Peal rivers in Guangzhou) was hydrophobic acid (HoA). The size fraction with molecular weight (MW) <1 kDa in both south waters had the highest THMFP. The results of cluster analysis showed that the parameters of fractions including DOC percentage (DOC%), UV₂₅₄%, SUVA₂₅₄ (specific UV₂₅₄ absorbance) and THMFP were better for representing the differences of DOM from the studied waters than specific THMFP (STHMFP). The weak correlation between SUVA₂₅₄ and STHMFP for either size or XAD fractions suggests that whether SUVA₂₅₄ can be used as an indicator for the reactivity of THM formation is highly dependent on the nature of organic matter.
Agid:
2102437