High efficiency, low pressure mercury vapour lamps producing radiation at the wavelengths of 254 plus 185 nm and 254 nm only, were used to investigate the H2O2 enhanced photo-oxidation of natural organic matter (NOM). NOM is a problem in drinking water for a number of reasons: aesthetics; it provides an energy source for the growth of microorganisms in the distribution system; and reacts with chlorine to produce potentially harmful disinfection by-products. One promising oxidant for the removal of NOM from drinking water is the hydroxyl radical. The aim of this work was to investigate the kinetics, mechanisms, and feasibility of treatment of a highly coloured natural water by H2O2 enhanced UV (254 nm alone or with 185 nm). Kinetic models were applied to the data as a tool to understand the mechanisms and give a basis for process scale-up. Electrical energy per order criteria were used to determine the most efficient process. Irradiation by 254 plus 185 nm was found to be more efficient than 254 nm alone for low H2O2 doses, although at higher doses the performance of the two systems became similar. Size exclusion chromatography revealed three distinct fragmentation patterns for the different processes.
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Research Article|
December 01 2002
Natural organic matter removal by enhanced photo-oxidation using low pressure mercury vapour lamps Available to Purchase
J. Thomson;
J. Thomson
*CRC for Water Quality and Treatment, School of Civil and Chemical Engineering, RMIT University, GPO Box 2476V, Melbourne, Victoria 3001, Australia
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F. Roddick;
F. Roddick
*CRC for Water Quality and Treatment, School of Civil and Chemical Engineering, RMIT University, GPO Box 2476V, Melbourne, Victoria 3001, Australia
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M. Drikas
M. Drikas
**CRC for Water Quality and Treatment, Australian Water Quality Centre, Private Mail Bag 3, Salisbury, South Australia 5108, Australia
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Water Supply (2002) 2 (5-6): 435–443.
Citation
J. Thomson, F. Roddick, M. Drikas; Natural organic matter removal by enhanced photo-oxidation using low pressure mercury vapour lamps. Water Supply 1 December 2002; 2 (5-6): 435–443. doi: https://doi.org/10.2166/ws.2002.0201
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