Understanding fouling behaviour of ultrafiltration membrane processes and natural water using principal component analysis of fluorescence excitation-emission matrices

Peiris, Ramila H.; Budman, Hector; Moresoli, Christine; Legge, Raymond L.

doi:10.1016/j.memsci.2010.03.047

Cited by 72 publications

(40 citation statements)

References 33 publications

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“…Bridging flocculation occurs as a result of adsorption, via hydrogen bonding, of individual polymer chains onto several particles simultaneously (Peiris et al 2010). The molecular bridges could bond the adjoining particles and broken flocs.…”

Section: Mechanismsmentioning

confidence: 99%

“…For neutral pH of water solution, amorphous aluminum hydroxide is the main existing form to develop sweep flocculation. On the other hand, bridging flocculation occurs as a result of adsorption, by hydrogen bonding, of individual polymer chains onto several particles simultaneously, forming molecular bridges between the adjoining particles in the floc, like polyacrylamide (PAM) (Peiris et al 2010).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Breakage and regrowth of flocs formed by sweep coagulation using additional coagulant of poly aluminium chloride and non-ionic polyacrylamide

Nan

Yao

Chen

et al. 2016

Environ Sci Pollut Res

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The breakage and regrowth of flocs formed by sweep flocculation were investigated on different flocculation mechanisms using additional dosage coagulant of poly aluminium chloride (PACl) and non-ionic polyacrylamide (PAM) to explore the reversibility after floc breakage. The optimal dosage of PACl was 0.15 mM (as alum), and zeta potential exceeding 1 mV meant that sweep flocculation was dominant in the pre-flocculated process. Re-coagulation efficiency increased with additional coagulants dosing, and sedimentation rates of flocs re-formed by small additional dosage of non-ionic PAM are faster than that of flocs re-formed by additional PACl. For additional inorganic coagulant (PACl) during regrowth processes, few negatively charged particles that existed in water sample restricted the effect of charge neutralization. An amorphous aluminum hydroxide precipitation could re-activate the weaker points on the broken floc surface, but regrown flocs have loose structure indicating worse settleability. For additional non-ionic PAM dosing, lower dosage showed large values of fractal dimension and average size, probably due to that unfolded curly molecular chain and exposed amide groups of non-ionic PAM which provide superb conditions for amide group interacting with particles. The use of non-ionic PAM in flocculation has advantage of being more effective than the cationic PACl, probably because it may avoid the re-stabilization of broken flocs by polymer adsorption driven by electrostatic attraction. Hence, appropriate dosing of PAM after breakage could improve the flocs characteristics with large size and compact structure.

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Section: Mechanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Breakage and regrowth of flocs formed by sweep coagulation using additional coagulant of poly aluminium chloride and non-ionic polyacrylamide

Nan

Yao

Chen

et al. 2016

Environ Sci Pollut Res

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“…This difference between the two UF systems was a consequence of the removal of different fractions of the humic-like substances in the raw water during the coagulation and adsorption processes. It is also likely that some of the EEM peak shifts result from the changes in concentration of one of the several overlapping components [50].…”

Section: Variation Of Dissolved Organic Matter (Dom) In the Watermentioning

confidence: 99%

Investigation of pre-coagulation and powder activate carbon adsorption on ultrafiltration membrane fouling

et al. 2014

Journal of Membrane Science

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a b s t r a c tPre-coagulation by alum before ultrafiltration without (CUF) and with (CAUF) powdered activated carbon (PAC) addition was investigated to explore the influence of PAC on membrane fouling. It was found that the continuous addition of a low dosage of PAC reduced membrane fouling for operational run periods o20 days, both for reversible and for irreversible components of fouling. The presence of PAC increased the removal of dissolved organic matter (DOM), particularly proteinaceous substances, and some fractions of humic-type substances. For a longer operation time (420 days) an increase in mainly reversible fouling was evident and was attributed to microorganism growth in the cake layer, as indicated by the enhanced concentrations of extracellular polymeric substances, such as polysaccharides and proteins. A process of crystallization of the coagulant floc in the cake layer with increasing operation time was believed to cause desorption of DOM from primary coagulation particles and a decrease in their size, and consequently a higher density of cake layer. PAC absorption of desorbed DOM within the cake layer, and residual DOM after coagulation, reduced DOM reaching the membrane surface and the extent of subsequent internal membrane fouling.Crown

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“…The research applications of aquatic fluorescence tracking have also been extended to include drinking water sources [68]. Several fluorescence studies have recently been undertaken to investigate the performance of drinking water treatment processes and have been able to successfully detect membrane fouling events [109,110] as well as to quantify organic matter removal and efficiency [111][112][113][114]. This area has also seen the early development of a deep-UV LED and laser-induced fluorescence system for fluorescence detection of water-dissolved organic species, looking toward the real-time fluorescence monitoring of drinking water [115].…”

Section: Identification Of Contamination Using Fluorescence Fingerprimentioning

confidence: 99%

Cross-connection detection in Australian dual reticulation systems by monitoring inherent fluorescent organic matter

Hambly

Henderson

Baker

et al. 2012

Environmental Technology Reviews

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New housing developments are now commonly incorporating dual reticulation water systems for the redistribution of recycled water back to households for non-potable use. Within such distribution systems is the potential for cross-connections between recycled and drinking water pipelines, and a number of such events have been documented both in Australia and internationally. While many cross-connections are unlikely to present a source of health concern given the high level of recycled water treatment, they do have the potential to negatively impact public confidence in dual reticulation systems. A rapid and highly sensitive method of cross-connection detection is required to increase consumer confidence in the construction and maintenance of such recycled water distribution systems. This paper reviews a number of current and potential cross-connection detection methods, highlighting the use of fluorescence spectroscopy as a highly promising analytical tool for portable cross-connection detection.

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Understanding fouling behaviour of ultrafiltration membrane processes and natural water using principal component analysis of fluorescence excitation-emission matrices

Cited by 72 publications

References 33 publications

Breakage and regrowth of flocs formed by sweep coagulation using additional coagulant of poly aluminium chloride and non-ionic polyacrylamide

Breakage and regrowth of flocs formed by sweep coagulation using additional coagulant of poly aluminium chloride and non-ionic polyacrylamide

Investigation of pre-coagulation and powder activate carbon adsorption on ultrafiltration membrane fouling

Cross-connection detection in Australian dual reticulation systems by monitoring inherent fluorescent organic matter

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