Chemical coagulation of molecular weight fractions from dissolved organic matter
AdvisorAmy, Gary L.
Sierka, Raymond A.
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PublisherThe University of Arizona.
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AbstractChemical coagulation of eighteen groundwater samples from the Santa Ana River Groundwater Basin was evaluated on the bench scale to determine its viability for treating these low quality groundwaters to current USEPA drinking water standards. The color and organic matter in both raw and treated water samples were characterized according to UV absorbance and DOC molecular weight fingerprints. Alum coagulation with 5 mg/L as Al successfully treated raw waters with color of up to 60 pcu and 190 mug/L THMFP to meet the standards of 15 pcu and 100 mug/L for color and THM, respectively. Variations of the coagulation process which showed merit were pH modification, pre-ozonation, and using a cationic polymer, Magnifloc 573C, as a sole coagulant. Coagulation preferentially removed high-molecular-weight material which was responsible for causing the greatest degree of color. These color bodies were not, however, responsible for the majority of the THMFP.