Influence of UV-Oxidation on the Metal Complexing Properties of NOM

Frimmel, Fritz H.; Vercammen, Karlien; Schmitt, Daniel

doi:10.1007/1-4020-3252-8_5

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…Regardless of the effects on precursors for regulated DBPs, there are clear indications that UV treatment can alter the structure and reactivity of NOM in measurable ways (e.g., the formation of aldehydes and acids). Frimmel and co‐workers (Frimmel et al, 2005; Frimmel, 1998) used highperformance size‐exclusion chromatography and fluorescence to characterize the effects of light on NOM from a brown water lake. They observed shifts toward lower molecular size, photobleaching, and nonuniform fluorescence enhancement.…”

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confidence: 99%

Effect of UV treatment on DBP formation

Reckhow¹,

Linden²,

Kim³

et al. 2010

Journal AWWA

103

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This study—s objective was to investigate the effect of ultraviolet (UV) treatment on the subsequent formation of regulated and unregulated disinfection by‐products (DBPs). UV treatment of two sets of waters did not substantially change the waters— tendency to form trihalomethanes, haloacetic acids, or total organic halogen under the conditions of these tests. Evidence was found of small reductions in the formation of these DBPs, but the decreases did not exceed 10%. Formation of chloropicrin and 1,1,1‐trichloropropanone increased as a result of medium‐pressure UV treatment but remained at levels well below those of the regulated DBPs. Low‐pressure UV did not cause any detectable increase in chloropicrin formation. The authors propose that photonitration leads to the formation of new nitroorganics during UV treatment and these form halonitromethanes during subsequent chlorination. It is recommended that the effects of UV treatment on nonregulated DBPs be considered as new UV drinking water systems are brought on line.

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confidence: 99%

Effect of UV treatment on DBP formation

Reckhow¹,

Linden²,

Kim³

et al. 2010

Journal AWWA

103

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“…The negative effect of the use of UV disinfection on HAA4 formation might be indicative of a decrease in NOM size and changes in reactivity due to the UV irradiation process itself (Frimmel, 1998; Frimmel et al, 2005; Liu et al, 2012; Magnuson et al, 2002). This in turn could impact the reactivity of NOM with chlorine (Chaukura et al, 2020; Reckhow et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

“…Similarly, TOC concentrations are significantly higher at sites using UV—a factor that the authors find is highly correlated with HAA formation. While the use of UV itself for water treatment does not form DBPs (including HAAs) due to the absence of a halogenating agent, UV irradiation can cause changes to the structure and reactivity of NOM (Frimmel, 1998; Frimmel et al, 2005; Liu et al, 2012; Magnuson et al, 2002; Paul et al, 2012; Wang et al, 2017), a critical precursor to DBP formation. Furthermore, UV treatment is always accompanied by one or more forms of chlorination to ensure the maintenance of a chlorine residual in the distribution system.…”

Section: Resultsmentioning

confidence: 99%

Characterization and drivers of haloacetic acids in New York State

Sayess

2023

AWWA Water Science

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The formation of disinfection byproducts (DBPs) in finished drinking water is an ongoing challenge for public health agencies and water utilities. The Fourth Unregulated Contaminant Monitoring Rule data were used to assess the prevalence and drivers of haloacetic acids (HAAs)—a class of DBPs—in New York State's (NYS) public water systems, with a focus on total measured (HAA9), regulated (HAA5), brominated (HAA6Br), and unregulated (HAA4) HAAs. The concentrations of all HAA groups in NYS are found to be similar to those nationally, with HAA4 composing approximately 20% of HAA9. Concentrations of all HAA groups are lowest in groundwater and highest in surface waters across NYS systems. Higher total organic carbon (TOC) concentrations lead to elevated HAA9 and HAA5, while higher bromide concentrations favor more HAA4 and HAA6Br. HAA4 concentrations are well predicted with pre‐oxidation/disinfection types, HAA5, TOC, and bromide concentrations, with an adjusted R2 of 70%.

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