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RIVERBANK FILTRATION: FATE OF DBP PRECURSORS AND SELECTED MICROORGANISMS
Citation:
Weiss, W. J., E. Bouwer, W. P. Ball, C. R. O'Melia, M. W. LeChevallier, AND T F. Speth*. RIVERBANK FILTRATION: FATE OF DBP PRECURSORS AND SELECTED MICROORGANISMS. JAW_0059039 , Lacey, M. (ed.), JOURNAL OF AMERICAN WATER WORKS ASSOCIATION. American Water Works Association, Denver, CO, 95(10):68-81, (2003).
Impact/Purpose:
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Description:
The fate of disinfection by-product (DBP) precursors and selected microorganisms during riverbank filtration (RBF) was monitored at three different mid-Western drinking water utilities. At all three sites, filtration (RBF) was monitored at three different mid-Western drinking water utilities. At all three sites, significant reductions were observed in total organic carbon (TOC), dissolved organic carbon (DOC), and DBP precursors upon bank filtration. TOC and DOC reductions at the closer wells at the three sites ranged from 30% to 67%. Trihalomethane (THM) formation potential (FP) and haloacetic acid (HAA) FP concentrations were reduced by 50% to 80% at the three sites. Reductions in precursors for haloacetonitriles, haloketones, chloral hydrate, and chloropicrin, ranged from 30% to 100% following bank filtration. Reductions in the concentrations of Clostridium were observed in excess of 3 log units. Reductions in the concentrations of two bacteriophage ranged from >1.9 to >3.3 logs. Limited occurrence of Giardia and Cryptosporidium in the river and well waters prevented the establishment of firm conclusions for the removal of these organisms.
