Distribution of dissolved organic matter fractions along several stages of a drinking water treatment plant

Gibert, Oriol; Lefèvre, Benoît; Teuler, A.; Bernat, Xavier; Tobella, Joana

doi:10.1016/j.jwpe.2015.03.006

Cited by 30 publications

(25 citation statements)

References 39 publications

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“…In this regard, BPs, by virtue of their high MW and size, are mostly retained by cake formation, and thus, amenable to being washed out by HCs. 55 BPs concentration in raw river water was higher in winter, which would be in accordance with the greater HC efficiency experienced. On the other hand, raw water physico-chemical characteristics (Table A1) showed greater turbidity and TSS content in summer, which would support the hypothesis of higher foulants load accumulated in summer periods.…”

Section: Coagulant Effect On Hydraulic Resistance Recovery By Hc and Cebsupporting

confidence: 70%

“…Taking into account that the HC sequence and conditions were not modified during the whole study, it can be concluded that in winter, either less foulants were accumulated between HCs, resulting in a more efficient HC, or foulants were more easily removed by the HCs. In this regard, BPs, by virtue of their high MW and size, are mostly retained by cake formation, and thus, amenable to being washed out by HCs . BPs concentration in raw river water was higher in winter, which would be in accordance with the greater HC efficiency experienced.…”

Section: Resultsmentioning

confidence: 81%

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Micro‐coagulation effects on direct ultrafiltration of challenging raw river water

Ferrer

Dekker

Mesa

et al. 2016

J of Chemical Tech & Biotech

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Background\ud \ud The feasibility and competitiveness of substituting the conventional pre-treatment of drinking water treatment plants (dioxichlorination, coagulation/flocculation, settling, sand filtration) by raw river water direct ultrafiltration (UF) was addressed.\ud \ud Results\ud \ud A full scale UF module was operated continuously for 2 years, treating highly variable surface water. The sustainable hydraulic conditions leading to a greater water yield from the direct UF treatment scheme under different scenarios were defined. Summer periods enabled the attainment of higher filtration fluxes, although raw river water showed greater turbidity and total suspended solids content. Winter periods presented higher dissolved organic carbon concentration, with greater biopolymers content, which have been claimed as main membrane foulants. A preliminary micro-coagulation of FeCl3 (<1.5 mg Fe(III) L-1) enabled supporting harsher hydraulic conditions and thus, implementing similar conditions throughout the year. Impacts of micro-coagulation were more pronounced on filtration, particularly in winter, but a positive effect was also noticed in hydraulic and chemical cleaning stages, increasing the efficiency of the former and decreasing by half the frequency of the latter.\ud \ud Conclusion\ud \ud Direct UF proved to be competitive with the current conventional pre-treatment, leading to a significant reduction in reagents needs and sludge production and an increased and more stable product water quality. © 2016 Society of Chemical IndustryPeer ReviewedPostprint (author's final draft

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Section: Coagulant Effect On Hydraulic Resistance Recovery By Hc and Cebsupporting

confidence: 70%

Section: Resultsmentioning

confidence: 81%

Micro‐coagulation effects on direct ultrafiltration of challenging raw river water

Ferrer

Dekker

Mesa

et al. 2016

J of Chemical Tech & Biotech

Self Cite

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“…The low retention of TOC by the UF membrane may be explained by the predominance of small molecular weight (MW) organic fractions with MW≤1000 Da (much smaller than the nominal MWCO of the UF membrane of 300000 Da, see Table 2) present in the decanted water [24]. …”

Section: Effect Of Backwashing Transmembrane Pressure (Bw Tmp )mentioning

confidence: 99%

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

Ferrer

Lefèvre

Prats

et al. 2016

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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“…In addition, their inadequate removal from water entering the water supply system may cause secondary pollution development, which in turn leads to poor water quality at the tap. It is therefore necessary to remove organic substances from water to achieve concentrations consistent with the requirements for the quality of water intended for human consumption [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

The sorption of organic compounds from water during technological start-up of carbon filters

et al. 2019

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Natural waters contain organic substances that have a major impact on the quality of water, in particular on its organoleptic properties. They can also change its physical and chemical properties and have a negative impact on the technological processes used during water treatment. There is no doubt that organic substances contained in natural waters have to be removed during treatment processes in order to achieve concentrations consistent with the requirements concerning the quality of water intended for human consumption. A very effective method of organic compounds elimination from water is to use of biologically active filters (BAF). This article presents the results of pilot scale research on the effectiveness of removal of organic compounds from water using filtration through a bed of activated carbon filters, during their technological start-up. The obtained results showed high, more than 91% efficiency of reducing the content of organic compounds expressed by TOC, COD (KMnO4) and UV254 absorbance. The predominant process at the start of the use of carbon filters has been sorption. During the research, the development of biofilm in the filter bed was also controlled. The identification of microorganisms showed the presence of Gram-negative bacteria in the beds of both filter columns.

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Distribution of dissolved organic matter fractions along several stages of a drinking water treatment plant

Cited by 30 publications

References 39 publications

Micro‐coagulation effects on direct ultrafiltration of challenging raw river water

Micro‐coagulation effects on direct ultrafiltration of challenging raw river water

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

The sorption of organic compounds from water during technological start-up of carbon filters

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