The effects of catchment soils and land-use on the relationship between organic matter with chlorine decay and THMFP
Date
2015
Authors
Awad, J.
van Leeuwen, J.
Chow, C.
Drikas, M.
Smernik, R.J.
Chittleborough, D.J.
Bestland, E.
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VATTEN = Journal of Water Management and Research, 2015; (71):159-166
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Abstract
With significant problems caused by organics in drinking water, comprehensive knowledge of its concentration,character and reactivity in relation to catchment features and management is important. In a study reportedhere, six contrasting zero order catchments of the Myponga Reservoir, South Australia were selected todetermine the impacts of catchment characteristics and land management practices on THM formation potential(THMFP) of aquatic DOM and the kinetics of chlorine decay. Runoff and sub-surface waters from thesecatchments were standardized in DOC concentration and then treated by alum coagulation. Chlorine decaytests and DOM characterization were performed and THMFP determined on standardized samples before andafter alum treatment. The results showed that runoff and subsurface waters from catchments having clay soilsand with native vegetation or grass, had lower THMFPs than waters from sandy soils with these vegetativetypes. Subsurface waters from two catchments with Pinus radiata had similar THMFP formation, regardless ofmarked variation in surface soil texture. Under standard conditions, the residual DOM in waters of the clayeysoil catchments after alum treatment showed faster chlorine bulk decay rates than of the corresponding sandysoil catchments. Organics in water from clay catchments were more difficult to remove by alum coagulation.
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Copyright 2015