Impact of UV/H(2)O(2) advanced oxidation treatment on molecular weight distribution of NOM and biostability of water |
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Authors: | Mohammad Mahdi Bazri Benoit Barbeau Madjid Mohseni |
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Affiliation: | a Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC, Canada V6T 1Z3 b Department of Civil, Geological, and Mining Engineering, Ecole Polytechnique de Montreal, Montreal, Quebec, Canada |
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Abstract: | The presence of natural organic matter (NOM) poses several challenges to the commercial practice of UV/H2O2 process for micropollutant removal. During the commercial application of UV/H2O2 advanced oxidation treatment, NOM is broken down into smaller species potentially affecting biostability by increasing Assimilable Organic Carbon (AOC) and Biodegradable Organic Carbon (BDOC) of water. This work investigated the potential impact of UV/H2O2 treatment on the molecular weight distribution of NOM and biostability of different water sources. A recently developed flow cytometric method for enumeration of bacteria was utilized to assess biological stability of the treated water at various stages through measurement of AOC. BDOC was also assessed for comparison and to better study the biostability of water. Both AOC and BDOC increased by about 3-4 times over the course of treatment, indicating the reduction of biological stability. Initial TOC and the source of NOM were found to be influencing the biostability profile of the treated water. Using high performance size exclusion chromatography, a wide range of organic molecule weights were found responsible for AOC increase; however, low molecular weight organics seemed to contribute more. Positive and meaningful correlations were observed between BDOC and AOC of different waters that underwent different treatments. |
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Keywords: | UV/H2O2 Advanced oxidation processes Natural organic matter Biological stability Assimilable organic carbon (AOC) Biodegradable organic carbon (BDOC) |
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