Effects of reverse osmosis isolation on reactivity of naturally occurring dissolved organic matter in physicochemical processes

Kilduff, James E.; Mattaraj, Supatpong; Wigton, Andrew; Kitiş, Mehmet; Karanfil, Tanju

doi:10.1016/j.watres.2003.10.049

Cited by 36 publications

(38 citation statements)

References 23 publications

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“…The result demonstrates that k′ has a direct impact on DOM distribution during the fractionation (Fig. 3a), consistent with previous studies Kilduff et al 2004). A 15-fold increase in k′ resulted in 31%, 23%, and 25% decrease in HPO fraction for GV2, MB, and SP waters, respectively.…”

Section: Large Column Fractionationsupporting

confidence: 91%

“…DOM was isolated from the source waters using a custom-built RO system that was used in our previous studies (Kitis et al 2001;Kilduff et al 2004). The schematic of the RO system is shown in Fig.…”

Section: Source Waters and Dom Isolationmentioning

confidence: 99%

“…The schematic of the RO system is shown in Fig. 1, and its detailed operation procedure can be found in elsewhere (Kitis et al 2001;Kilduff et al 2004) and is also provided in Appendix 2. GV and SP isolations were conducted in a winter season inside of buildings where the temperature of the feed water was maintained relatively constant at 15-20°C.…”

Section: Source Waters and Dom Isolationmentioning

confidence: 99%

“…specific ultraviolet absorbance (SUVA) and molecular weight distribution] and reactivity (e.g. DBP formation potentials; Hem and Efraimsen 1999;Kitis et al 2001;Kilduff et al 2004). However, RO isolation unavoidably results also in concentration of inorganic ions, which may cause membrane fouling and undesired alteration of DOM characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Isolation and fractionation of natural organic matter: evaluation of reverse osmosis performance and impact of fractionation parameters

Song

Orr

Hong

et al. 2008

Environ Monit Assess

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Dissolved organic matter (DOM) from three surface waters was isolated using reverse osmosis (RO) and subsequently fractionated using resin adsorption chromatography (RAC). Efficacy of RO was evaluated by closing mass balances for dissolved organic carbon (DOC). RAC was evaluated by investigating the effect of column operational parameters (column capacity factor, k', and solute initial concentration, C0) on DOM fractionation and subsequent disinfection by-product formation. Efficacy of RO was dependent on both isolation conditions and source water characteristics. In general, RO more effectively isolated DOM in high specific ultraviolet absorbance (SUVA254) water than low SUVA254 water, and showed higher DOM recovery at ambient pH (approximately 7) than at low pH (approximately 4). The fractionation of the isolated DOM indicated that the relative amount of the hydrophobic fraction decreased with increasing k', thus affecting the overall distribution of DOM. However, the distribution of DOM fractions was not influenced by varying C0 up to 150 mg l(-1) at k' of 15. The effect of k' on the formation and speciation of trihalomethanes (THM) and haloacetic acids (HAA) was not significant up to k' of 30.

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Section: Large Column Fractionationsupporting

confidence: 91%

Section: Source Waters and Dom Isolationmentioning

confidence: 99%

Section: Source Waters and Dom Isolationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Isolation and fractionation of natural organic matter: evaluation of reverse osmosis performance and impact of fractionation parameters

Song

Orr

Hong

et al. 2008

Environ Monit Assess

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“…One study has shown that RO isolates have a higher MW than the original raw filtered water, leading to the postulation that some condensation reactions may occur during the isolation process (Maurice et al, 2002). However, a detailed study found that properties such as size, polarity, charge density and isoelectric point were preserved with RO isolation, which gave an organics rejection of >99% (Kilduff et al, 2004).…”

Section: Introduction 28mentioning

confidence: 99%

Effect of NOM characteristics and membrane type on microfiltration performance

Gray

Ritchie²,

Tran

et al. 2007

Water Research

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Efforts to understand and predict the role of different organic fractions in the fouling of low-pressure membranes are presented. Preliminary experiments with an experimental apparatus that incorporates automatic backwashing and filtration over several days has shown that microfiltration of the hydrophilic fractions leads to rapid flux decline and the formation of a cake or gel layer, while the hydrophobic fractions show a steady flux decline and no obvious formation of a gel or cake layer. The addition of calcium to the weakly hydrophobic acid (WHA) fraction led to the formation of a gel layer from associations between components of the WHA. The dominant foulants were found to be the neutral and charged hydrophilic compounds, with hydrophobic and small pore size membranes being the most readily fouled. The findings suggest that surface analyses such as FTIR will preferentially identify hydrophilic compounds as the main foulants, as these components form a gel layer on the surface while the hydrophobic compounds adsorb within the membrane pores.Furthermore, coagulation pre-treatment is also likely to reduce fouling by reducing pore constriction rather than the formation of a gel layer, as coagulants remove the hydrophobic compounds to a large extent and very little of the hydrophilic neutral components.

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Dissolved Organic Matter (DOM) in Natural Environments

Frimmel

Abbt‐Braun

2009

Biophysico‐Chemical Processes Involving Natural Nonliving Organic Matter in Environmental Systems

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Effects of reverse osmosis isolation on reactivity of naturally occurring dissolved organic matter in physicochemical processes

Cited by 36 publications

References 23 publications

Isolation and fractionation of natural organic matter: evaluation of reverse osmosis performance and impact of fractionation parameters

Isolation and fractionation of natural organic matter: evaluation of reverse osmosis performance and impact of fractionation parameters

Effect of NOM characteristics and membrane type on microfiltration performance

Dissolved Organic Matter (DOM) in Natural Environments

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