Isolation of natural organic matter ? The influence on the assimilable organic carbon

Hem, Lars J.; Efraimsen, Harry

doi:10.1016/s0160-4120(98)00113-5

Cited by 8 publications

(5 citation statements)

References 18 publications

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“…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%

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: Introductionmentioning

confidence: 99%

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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“…Studies found that the biofilm formation potential was also related to the chemical and microbiological characteristics of water [6][7][8][9]. Especially for the organic content of water, the organic-carbon availabilities would lead to different biofilm formation [10][11][12]. In addition, dissolved organic matters were difficult to remove effectively in conventional water treatment processes, and the residual content could become the increasing contamination load for tap water [13].…”

Section: Introductionmentioning

confidence: 99%

Influence Mechanism of Cyanobacterial Extracellular Polymeric Substances on the Water Quality in Dynamic Water Supply System

Sun

et al. 2021

Sustainability

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As a kind of high-organic-content contamination source, extracellular polymeric substances (EPS) secreted by cyanobacteria have become an important factor restricting the safety of supply water. In the dynamic batch mode water supply system, cyanobacterial EPS accelerated the decay rate of residual chlorine, resulting in a 21–26 times increase of the total viable bacteria count within 72 h. The water turbidity exceeded upper limit of the standards for drinking water quality within 4 h, with an increase of 306–332% within 72 h. The biological stability was reduced with BDOC and AOC increased by 41.4–43.8% and 331–396%, respectively. The main cause is that cyanobacterial EPS act as nutrients and metabolic energy for microorganisms, promoting their metabolic activity and secretion of extracellular organic components. This leads to the metabolic accumulation of tryptophan, fulvic acids and humic acids in the pipeline, thus further promoting the regeneration of bacteria. Compared with the influence of biofilm on pipe wall caused by long-term use of water supply network, the contribution of cyanobacterial EPS to the water contamination of pipe network is increased several times. Therefore, even in the presence of residual chlorine, the secondary contamination caused by cyanobacterial EPS in the water supply system could not be neglected.

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“…Despite extensive use of this technique in NOM research, the DBP reactivity of lyophilized NOM has not been evaluated. Recovery data have been reported; Kunte and Pfeifer (1985) reported 87% recovery of DOC, and Hem and Efraimsen (1999) reported 10% loss of assimilable organic carbon after RO concentration, lyophilization, and reconstitution. Recently, McCurry et al (2012) reported an improved lyophilization method for NOM that recovered 101% of the TOC and 91% of the UV 254 absorbance.…”

Section: Introductionmentioning

confidence: 99%

Disinfection byproduct formation in reverse-osmosis concentrated and lyophilized natural organic matter from a drinking water source

et al. 2012

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Isolation of natural organic matter ? The influence on the assimilable organic carbon

Cited by 8 publications

References 18 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

Influence Mechanism of Cyanobacterial Extracellular Polymeric Substances on the Water Quality in Dynamic Water Supply System

Disinfection byproduct formation in reverse-osmosis concentrated and lyophilized natural organic matter from a drinking water source

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