Organic fouling of nanofiltration membranes: Evaluating the effects of humic acid, calcium, alum coagulant and their combinations on the specific cake resistance

Listiarini, Karina; Sun, Darren Delai; Leckie, James O.

doi:10.1016/j.memsci.2009.01.037

Cited by 116 publications

(73 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pretreatment before UF, especially by "in-line" chemical coagulation or coagulation-hydraulic flocculation, has been shown to be an effective way to control membrane fouling [6][7][8], and improve general water quality [1,9,10]. However, not all contaminants can be fully removed by the coagulation process, particularly biopolymers, such as polysaccharides and proteins [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

Journal of Membrane Science

View full text Add to dashboard Cite

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

show abstract

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

Journal of Membrane Science

View full text Add to dashboard Cite

show abstract

“…The properties of flocs, including size and structure, have been proved to have remarked influences on membrane foulings [31,32]. Particle diameter is inversely proportional to specific cake resistance as stated in the well-known Carman-Kozeny equations [32]. According to the results shown in Fig.…”

Section: Membrane Filtrationmentioning

confidence: 97%

“…Specifically, the fluxes by PD-alum/PD-PACl were obviously larger than those by single aluminum and dual coagulants with PD dosed lastly, owing to the different effects of PD on floc characteristics. The properties of flocs, including size and structure, have been proved to have remarked influences on membrane foulings [31,32]. Particle diameter is inversely proportional to specific cake resistance as stated in the well-known Carman-Kozeny equations [32].…”

Section: Membrane Filtrationmentioning

confidence: 99%

Impacts of organic coagulant aid on purification performance and membrane fouling of coagulation/ultrafiltration hybrid process with different Al-based coagulants

Yue

Gao

et al. 2015

Desalination

View full text Add to dashboard Cite

“…The composition of NOM can be investigated by numerous methods, including physicochemical fractionation and spectroscopic measurements. NOM fractionation, using adsorption resins, is generally considered a state-of-art method, which is used to estimate the behaviours and properties of NOM from various sources (Listiarini et al (2009)). A method for measuring the spectra of NOM using fluorescence spectroscopy is also largely accepted as an adequate method for the qualitative characterisation of NOM (Peuravuori et al (2002)).…”

Section: Rapid Mixing For Nom Removalmentioning

confidence: 99%

Review of Coagulation’s Rapid Mixing for NOM Removal

Ghernaout¹,

Boucherit²

2015

CHEM

View full text Add to dashboard Cite

This review focuses on rapid mixing in the coagulation process for improved natural organic matter (NOM) removal in water treatment. Rapid mixing aims to instantly and efficiently disperse coagulant species into raw water, before flocculation, sedimentation, and filtration processes. Mechanical mixing with a longer retention time cannot guarantee an instantaneous and uniform coagulant dispersion. For this reason, the so-called pump diffusion mixer (PDM) has been proposed. Using various rapid mixing devices to test the sedimentation performance, it is showed that in-line hydraulic jet and static mixers are able to achieve performance equivalent to that of the mechanical mixing type at a lower coagulant dosage. On the other hand, the removal of NOM as disinfection by-products (DBPs) precursor by chemical coagulation (CC) has been extensively studied. It is well reported that enhanced coagulation (EC) by adjusting the pH downwards to 4-5 prior to coagulant addition will encourage the formation of soluble NOM-Al complex from low-turbidity waters. In case of most waters, therefore, acid must be added to maintain the desired coagulation pH for EC, and excess coagulant is required to improve the removal of NOM. However, CC using in-line hydraulic jet mixer such as PDM is a reasonable method for the improvement of coagulation process compared to EC, since it is possible to obtain good removals of NOM as well as turbidity using a lower dosages of coagulant without supplementary addition of chemicals for pH control and thus producing a smaller volume of waste solids.

show abstract

Organic fouling of nanofiltration membranes: Evaluating the effects of humic acid, calcium, alum coagulant and their combinations on the specific cake resistance

Cited by 116 publications

References 27 publications

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

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

Impacts of organic coagulant aid on purification performance and membrane fouling of coagulation/ultrafiltration hybrid process with different Al-based coagulants

Review of Coagulation’s Rapid Mixing for NOM Removal

Contact Info

Product

Resources

About