Photodegradation‐Induced Changes in the Characteristics of Dissolved Organic Matter with Different Sources and Their Effects on Disinfection By‐Product Formation Potential. Issue 5 (17th October 2013)

• Record Type: Journal Article
• Authors: Lee, Mi‐Hee; Hur, Jin
• Is Part Of: Clean. Volume 42:Issue 5(2014:May)
• Page Start: 552
• Page End: 560
• Publication Date: 2013-10-17
• Subjects: Water quality -- Periodicals; Water -- Pollution -- Periodicals; Pollution -- Periodicals; Bioremediation -- Periodicals; Sewage -- Periodicals; Water chemistry -- Periodicals; 333.7205
• DOI: 10.1002/clen.201200685
• Languages: English
• ISSNs: 1863-0650

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="clen201200685-sec-0001" sec-type="section"> <p>Changes in the apparent characteristics of dissolved organic matter (DOM) upon photodegradation and their influences on disinfection by‐products formation potentials (DBPFP) were examined using biodegraded DOM from six different sources (leaf litter, algae, compost, paddy water, treated sewage, and headwater). After seven day UV irradiation, no substantial changes occurred in the dissolved organic carbon (DOC) concentrations, but significant decreases were observed for the specific UV absorbance. In general, fulvic‐like and humic‐like fluorophores appear to be more affected by photodegradation than protein‐like fluorophores (or DOM components) and/or than the DOM structures associated with a shorter excitation wavelength. Size exclusion chromatograms revealed that UV absorbing molecules of intermediate size ranging from 1 to 5 kDa were most vulnerable to the UV irradiation. Except for leaf litter‐derived DOM, UV irradiation did not lead to substantial changes in specific DBPFP (i.e. disinfection by‐product (DBP)/dissolved organic carbon) comparable to those of the DOM characteristics, suggesting that many of the DBP precursors were not easily removed by photodegradation or some photochemically produced compounds could operate as DBP precursors. All the DOM samples exhibited greater formation potential for haloacetic acids per organic carbon than trihalomethanes irrespective of the sources. In general, correlations between DOM properties and specific DBPFP became stronger after photodegradation. The intermediate sized UV‐absorbing moieties appear to be actively involved in forming DBPs for photodegraded DOM. An integrated region of protein‐like fluorescence intensities may be suggested as an estimation index for specific DBPFP independent of the DOM sources.</p> </sec> </abstract>