Characterization of natural organic matter adsorption in granular activated carbon adsorbers

Velten, Silvana; Knappe, Detlef R.U.; Traber, Jacqueline; Kaiser, Hans‐Peter; Gunten, Urs von; Boller, Markus; Meylan, Sébastien

doi:10.1016/j.watres.2011.04.047

Cited by 201 publications

(105 citation statements)

References 30 publications

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“…Regarding the efficiency of activated carbon, reported values ranged from 8 to 80 %, depending on the type of carbon, the water characteristics and the volume of water passed through. This process reduces mainly the low MW, hydrophilic, and biodegradable fractions of NOM (Gibert et al 2013;Velten et al 2011). In our study, the reported removal …”

Section: Dissolved Organic Carbonsupporting

confidence: 48%

Fate of natural organic matter at a full-scale Drinking Water Treatment Plant in Greece

Papageorgiou

Papadakis

Voutsa

2015

Environ Sci Pollut Res

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The aim of this study was to investigate the fate of natural organic matter (NOM) and subsequent changes during the various treatment processes at a full-scale Drinking Water Treatment Plant (DWTP). Monthly sampling campaigns were conducted for 1 year at six sites along DWTP of Thessaloniki, Northern Greece including raw water from the Aliakmonas River that supplies DWTP and samples from various treatment processes (pre-ozonation, coagulation, sand filtration, ozonation, and granular activated carbon (GAC) filtration). The concentration of NOM and its characteristics as well as the removal efficiency of various treatment processes on the basis of dissolved organic carbon, UV absorbance, specific ultra-violet absorbance, fluorescence intensity, hydrophobicity, biodegradable dissolved organic carbon, and formation potential of chlorination by-products trihalomethanes (THMs) and haloacetic acids (HAAs) were studied. The concentration of dissolved organic carbon (DOC) in reservoir of the Aliakmonas River ranged from 1.46 to 1.84 mg/L, exhibiting variations regarding UV, fluorescence, and hydrophobic character through the year. Along DWTP, a significant reduction of aromatic, fluorophoric, and hydrophobic character of NOM was observed resulting in significant elimination of THM (63%) and HAAs (75%) precursors.

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Section: Dissolved Organic Carbonsupporting

confidence: 48%

Fate of natural organic matter at a full-scale Drinking Water Treatment Plant in Greece

Papageorgiou

Papadakis

Voutsa

2015

Environ Sci Pollut Res

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“…The LMWA fraction was always found below limit detection. This composition is in accordance with previous studies that also applied HPSEC for the fractionation of NOM after sand filtration of river water [33,34]. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 finding is in agreement with Peter-Varbanets et al [35], who also observed that "only biopolymers and the humic acid fraction of NOM were retained to some extent during filtration" of different types of water.…”

Section: Effect Of the Chemically Enhanced Bw Composition (Bw Ceb-c )supporting

confidence: 93%

Reversibility of fouling on ultrafiltration membrane by backwashing and chemical cleaning: differences in organic fractions behaviour

Ferrer

Lefèvre

Prats

et al. 2015

Desalination and Water Treatment

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Membrane fouling is an inherent phenomenon in UF membrane processes, making it necessary to periodically perform backwashes (BW) and chemical "cleanings in place" (CIP) to restore the initial permeability of the membrane. The objective of this study was 1) to explore systematically the effect of distinct BW-related variables (BW transmembrane pressure, duration, frequency, composition) on the reversibility of UF membrane fouling and on the permeate quality (in terms of total organic carbon, turbidity and UV absorbance) over successive filtration/BW cycles; and 2) to identify which organic fractions were most removed by the membrane and, of these, which were most detached after BW, alkaline and oxidant CIP and acid CIP episodes. For this purpose, a bench-scale outside-in hollow fibre module operated under dead-end filtration mode at constant transmembrane pressure and treating settled water from a drinking water treatment plant was employed. Dissolved organic carbon fractionation was performed by high performance size exclusion chromatography (HPSEC). Results showed that in general the more intensive a BW was (in terms of high transmembrane pressure, shortened frequency and prolonged duration) the more effective it was in removing fouling from the membrane. Concerning the composition of the water used for the BW, the addition of NaClO led to maximum fouling reversibility, closely followed by the combination of NaOH+NaClO, while citric acid and NaOH contributed little compared to water alone.However, results also showed that irreversible fouling was never completely avoided whatever the BW regime applied, leading to a gradual increase of the total resistance over time. Larger

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“…The definitions of the individual fractions and the quantification were made via the customized software (ChromCALC, DOC- . This automated quantification has been widely adopted in a number of similar studies (Baghoth et al 2011;Gibert et al 2013;Velten et al 2011). The defined chromatogram area of each fraction and the peak heights were consistently decreased with each treatment although the extent of the reduction varied with the types of the treatment and the fraction.…”

Section: Resultsmentioning

confidence: 99%

Tracking the behavior of different size fractions of dissolved organic matter in a full-scale advanced drinking water treatment plant

Quang

Choi²,

Hur

2015

Environ Sci Pollut Res

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In this study, five different dissolved organic matter (DOM) fractions, defined based on a size exclusion chromatography with simultaneous detection of organic carbon (OCD) and ultraviolet (UVD), were quantitatively tracked with a treatment train of coagulation/flocculation-sand filtration-ozonation-granular activated carbon (GAC) filtration in a full-scale advanced drinking water treatment plant (DWTP). Five DOM samples including raw water were taken after each treatment process in the DWTP every month over the period of three years. A higher abundance of biopolymer (BP) fraction was found in the raw water during spring and winter than in the other seasons, suggesting an influence of algal bloom and/or meltwater on DOM composition. The greater extent of removal was observed upon the coagulation/flocculation for high-molecular-weight fractions including BP and humic substances (HS) and aromatic moieties, while lower sized fractions were preferentially removed by the GAC filtration. Ozone treatment produced the fraction of low-molecular-weight neutrals probably resulting from the breakdown of double-bonded carbon structures by ozone oxidation. Coagulation/flocculation was the only process that revealed significant effects of influent DOM composition on the treatment efficiency, as revealed by a high correlation between the DOM removal rate and the relative abundance of HS for the raw water. Our study demonstrated that SEC-OCD-UVD was successful in monitoring size-based DOM composition for the advanced DWTP, providing an insight into optimizing the treatment options and the operational conditions for the removal of particular fractions within the bulk DOM.

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Characterization of natural organic matter adsorption in granular activated carbon adsorbers

Cited by 201 publications

References 30 publications

Fate of natural organic matter at a full-scale Drinking Water Treatment Plant in Greece

Fate of natural organic matter at a full-scale Drinking Water Treatment Plant in Greece

Reversibility of fouling on ultrafiltration membrane by backwashing and chemical cleaning: differences in organic fractions behaviour

Tracking the behavior of different size fractions of dissolved organic matter in a full-scale advanced drinking water treatment plant

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