Allochthonous Contributions of THM Precursors to a Eutrophic Reservoir

Stepczuk, Carol; Martin, Angela B.; Longabucco, Patricia; Bloomfield, Jay A.; Effler, Steven W.

doi:10.1080/07438149809354342

Cited by 17 publications

(11 citation statements)

References 27 publications

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“…These results were consistent with those of Stepczuk and co‐workers (1998a), who measured specific THMFP and DOC concentration in the West Branch Delaware River (inflow to Cannonsville Reservoir) related to 11 runoff episodes and found a strong relationship between DOC concentration and stream flow, attributed to flushing of NOM from the watershed. Runoffs in the fall were linked with higher DOC concentrations; Stepczuk and colleagues attributed this to seasonal differences in NOM content in the watershed as well as temperature effects on microbiological activity in the soils.…”

Section: Discussionsupporting

confidence: 91%

“…Stepczuk and co‐workers also found that the relationship between specific THMFP and stream flow during runoff episodes was less strong than that for DOC and stream flow; furthermore, increases in specific THMFP during the rising limb of these episodes was short‐lived. As a result the authors concluded that DOC was a poor surrogate for THM precursor concentrations to support management actions for Cannonsville Reservoir (Stepczuk et al, 1998a). Monitoring of in‐reservoir THMFP profiles showed higher concentrations during the summer in the reservoir compared with the stream, indicating autochthonous (in‐reservoir) precursor sources.…”

Section: Discussionmentioning

confidence: 99%

“…Conditions used for DBPFP tests vary considerably ( Standard Methods, 1999; Summers et al, 1996; Koch et al, 1991). The current analysis used a set of modified test conditions (Table 1) that reflected the conditions used in previous studies of the NYC reservoirs (NYCDEP, 2010; Stepczuk et al, 1998a, 1998b) but with a shorter incubation time and a higher chlorine residual closer to the conditions published in Standard Methods (1999).…”

Section: Study Specificsmentioning

confidence: 99%

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Minimizing raw water NOM concentration through optimized source water selection

Weiss

Schindler²,

Freud³

et al. 2013

Journal AWWA

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Natural organic matter (NOM) is present in all raw water supplies and is the major precursor to chlorinated disinfection by‐products (DBPs). Reducing the amount of NOM entering treatment plants and better understanding the character of NOM in raw water supplies are essential for optimizing treatment and meeting more‐stringent regulations. A study of the unfiltered New York City (NYC) water supply system evaluated the extent to which alternative raw water selection strategies could reduce finished water DBP concentrations. A two‐year monitoring program was conducted to establish spatial and temporal patterns of DBP precursors in NYC's upstate reservoirs. System operations modeling was driven with a statistically generated, long‐term time series of dissolved organic carbon concentrations for each reservoir as a proof‐of‐concept evaluation of alternative operating rules to minimize precursor transport to terminal reservoirs. Results found that DBP precursors varied widely among reservoirs and over time but that modified reservoir operations could substantially reduce finished water DBP concentrations.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Study Specificsmentioning

confidence: 99%

See 1 more Smart Citation

Minimizing raw water NOM concentration through optimized source water selection

Weiss

Schindler²,

Freud³

et al. 2013

Journal AWWA

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show abstract

“…During a 15month period that included two summers and intervening months, tributary inputs corresponded to 80% of exported THM precursor fluxes whereas internal processes resulted in a net generation of an additional 20%. These results contrast with those of prior research focusing on Cannonsville Reservoir (N.Y.) that partitioned THM loadings into internal and external sources (Stepczuk et al, 1998a;1998b;1998c) Stepczuk and colleagues reported that internal processes arising from epilimnetic phytoplankton production were the principal source of THM precursors accounting for two thirds of the cumulative input. The apparent discrepancy between that research and the study described here cannot be attributed to differences in hydrologic loading rates because the two reservoirs had comparable water residence times (Taylorsville Lake = 84 days, Cannonsville Reservoir = 125 days).…”

Section: Discussioncontrasting

confidence: 91%

Internal and external sources of THM precursors in a midwestern reservoir

Bukaveckas

McGaha²,

Shostell

et al. 2007

Journal AWWA

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Trihalomethanes (THMs) are contaminants of drinking water produced by the reaction between chlorine and natural organic matter. Determination of THM formation potential (THMFP) is a means of quantifying precursor abundance in waters from diverse sources. THMFP in river water entering and leaving Taylorsville Lake (Ky.) was measured to assess internal and external sources of THM precursors. THMFP in Taylorsville Lake was largely determined by watershed inputs. External inputs from tributary streams accounted for 80% of reservoir THMFP, and internal processes resulted in a net generation of 20%. Chlorophyll concentrations in the main tributary (Salt River) were comparable to those measured in Taylorsville Lake, suggesting that algal production in source waters may be important in regulating precursor supply to the reservoir. The highest THMFP was found in hypolimnetic samples, and peak export from the reservoir occurred during fall turnover, suggesting that decomposition of sedimenting organic matter both delayed and enhanced precursor release.

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“…The authors attributed the external sources to primary production in the tributaries of the reservoir. These results were contrasted with the work of Stepczuk and colleagues (Stepczuk et al 1998a;1998b) in Cannonsville Reservoir (N ew York) where phytoplankton production within the reservoir was implicated as the primary source of TH M precursors.…”

contrasting

confidence: 75%

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Journal AWWA

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Allochthonous Contributions of THM Precursors to a Eutrophic Reservoir

Cited by 17 publications

References 27 publications

Minimizing raw water NOM concentration through optimized source water selection

Minimizing raw water NOM concentration through optimized source water selection

Internal and external sources of THM precursors in a midwestern reservoir

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