Reversible and irreversible low-pressure membrane foulants in drinking water treatment: Identification by principal component analysis of fluorescence EEM and mitigation by biofiltration pretreatment

Peldszus, Sigrid; Hallé, Cynthia; Peiris, Ramila H.; Hamouda, Mohamed A.; Jin, Xiaohui; Legge, Raymond L.; Budman, Hector; Moresoli, Christine; Huck, Peter M.

doi:10.1016/j.watres.2011.07.022

Cited by 151 publications

(65 citation statements)

References 23 publications

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“…Humic substances [10][11][12][13][14] and biopolymers [15][16][17][18][19][20][21] in natural surface water have been intensively acknowledged as the main organic foulants on UF/MF membranes in both hydraulically reversible and irreversible fouling. Zheng et al [22] identified organic matter larger than the UF pore size as the major foulants, which contribute to the cake layer formation, while only a small remaining portion (unquantified) remains as hydraulically irreversible fouling after backwash.…”

Section: Introductionmentioning

confidence: 99%

Hydraulically irreversible fouling on ceramic MF/UF membranes: Comparison of fouling indices, foulant composition and irreversible pore narrowing

Shang

Vuong

et al. 2015

Separation and Purification Technology

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. irreversible fouling, is still a critical aspect affecting the operational cost and energy consumption in water treatment plants. In this study, four ceramic membranes with pore sizes or molecular weight cut-off (MWCO) of 0.20 μm, 0.14 μm, 300 kDa and 50 kDa were compared during natural surface water filtration with respect to hydraulically irreversible fouling index (HIFI), foulant composition and narrowing of pore size due to the irreversible fouling. Our results showed that the hydraulically irreversible fouling index (HIFI) was proportional to the membrane pore size (r 2 =0.89) when the same feed water was filtrated. The UF membranes showed lower HIFI values than the MF membranes. Pore narrowing (internal fouling) was found to be a main fouling pattern of the hydraulically irreversible fouling. The internal fouling was caused by monolayer adsorption of foulants with different sizes that is dependent on the size of the membrane pore.

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Section: Introductionmentioning

confidence: 99%

Hydraulically irreversible fouling on ceramic MF/UF membranes: Comparison of fouling indices, foulant composition and irreversible pore narrowing

Shang

Vuong

et al. 2015

Separation and Purification Technology

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“…Then, the biopolymer concentration increased and the filtration resistance increased at contact times longer than 15 min. Previous studies have reported that longer contact times in BCFs lead to superior biopolymer removal [9,10]. However, the results presented herein suggest that optimizing the contact time is crucial.…”

Section: Effect Of Bcf Pretreatment On Mf Membrane Foulingmentioning

confidence: 68%

Effect of Biological Contact Filters (BCFs) on Membrane Fouling in Drinking Water Treatment Systems

Hasegawa

Iwamoto

Miyoshi

et al. 2017

Water

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Membrane fouling is a serious problem in drinking water treatment systems. Biological contact filters (BCFs) are often used as a pretreatment to remove ammonia, dissolved organic matter (DOM), and metal ions such as iron and manganese. In this study, the effect of BCF as a pretreatment for membrane fouling was evaluated using a laboratory-scale mini module consisting of a mini BCF column and a mini MF column. Initially, it was confirmed that the main foulant was a biopolymer (at low concentration) in the raw water. Subsequently, the biopolymer concentrations in the BCF influent and effluent were measured with the excitation emission matrix (EEM) fluorescence spectroscopy and the liquid chromatograph organic carbon detector (LC-OCD). The fouling potential of the BCF influent and effluent was also measured to evaluate MF membrane fouling rate. The results demonstrate that application of the BCF reduced the biopolymer concentration of the effluent and reduced membrane fouling. The effect of BCF was also established in an actual drinking water treatment plant. It was found that optimizing the contact time of raw water with the BCF was crucial to reduce membrane fouling.

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“…According to Darcy's law, a decrease in J under constant ∆P during membrane filtration process (or equivalently an increase in ∆P under constant J) is indicative of membrane fouling. The total resistance can be described by the resistance-in-series model and expressed as [4,10,13]:…”

Section: Data Treatment For the Membrane Hydraulic Performance Evaluamentioning

confidence: 99%

“…Among these, the effect of feed water composition and membrane operating conditions have been most researched [8,[13][14][15], while less studies have dealt with the effect that BW variables Comparison of results from studies on BW variables is, moreover, not entirely reliable and needs to be treated with caution for several reasons. First, these studies treat different types of water: wastewater [2,5,6,11,12,16], seawater [1,17,18] and surface water [3,10], each with different fouling behaviour potential under a given BW regime.…”

Section: Introductionmentioning

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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Reversible and irreversible low-pressure membrane foulants in drinking water treatment: Identification by principal component analysis of fluorescence EEM and mitigation by biofiltration pretreatment

Cited by 151 publications

References 23 publications

Hydraulically irreversible fouling on ceramic MF/UF membranes: Comparison of fouling indices, foulant composition and irreversible pore narrowing

Hydraulically irreversible fouling on ceramic MF/UF membranes: Comparison of fouling indices, foulant composition and irreversible pore narrowing

Effect of Biological Contact Filters (BCFs) on Membrane Fouling in Drinking Water Treatment Systems

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

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