Removal of arsenic from contaminated groundwater by membrane-integrated hybrid treatment system

Sen, Mausumi; Manna, Ajay K.; Pal, Parimal

doi:10.1016/j.memsci.2010.02.063

Cited by 139 publications

(47 citation statements)

References 20 publications

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“…5a shows that the water fluxes linearly increase with the increase in TMP. This is in accordance with previous studies [45][46][47]. As shown in Fig.…”

Section: Pfos Removal By Nanofiltration Processsupporting

confidence: 94%

Removal of perfluorooctane sulfonates from water by a hybrid coagulation–nanofiltration process

Zhao

et al. 2016

Chemical Engineering Journal

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“…5a shows that the water fluxes linearly increase with the increase in TMP. This is in accordance with previous studies [45][46][47]. As shown in Fig.…”

Section: Pfos Removal By Nanofiltration Processsupporting

confidence: 94%

Removal of perfluorooctane sulfonates from water by a hybrid coagulation–nanofiltration process

Zhao

et al. 2016

Chemical Engineering Journal

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“…Secondly, the membrane charge density in terms of zeta potential decreases with pH increase; membrane becomes more negative as pH increases, increasing the effect of charge exclusion in rejection. This is consistent with the previous observation that NF membranes exhibit a typical Donnan exclusion behavior and charge interaction charge the separation of negative solutes [20,21]. This result indicates that pH has a significant influence on As(V) removal due to arsenic speciation with variation in pH [15,22].…”

Section: Effect Of Ph On Arsenic Removalsupporting

confidence: 92%

Arsenic Removal from Drinking Water by Self-Made PMIA Nanofiltration Membrane

Zhao¹,

Du²,

Wang³

et al. 2012

ACES

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A self-made PMIA asymmetric nanofiltration membrane was used for arsenic removal from drinking water by NF process. Effects of feed concentration, operating pressure, pH and existing ions on As(V) removal were investigated. Experimental results showed that As(V) rejection was higher than 90% in the range of investigated As feed concentrations. The As(V) rejection increased slightly with pressure increase, As(V) rejection was higher than 90% in the pressure range of 0.4 MPa to 0.8 MPa. As(V) rejection increased significantly from 83% at pH 3 to 99% at pH 9. The presence of NaCl enhanced As(V) rejection in the range of feed concentration, and As(V) rejection can reach up to 99% at a feed As concentration of 100 μg/L, whereas there was a rejection decrease of 8% in the presence of Na 2 SO 4 at every feed concentration. The results showed the As(V) detected in the permeate was lower than the EPA recommended MCL up to a feed As concentration of approximately 10 μg/L in the experimental research range.

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“…The distinguishing characteristics of NF membranes -such as their ability to retain small organic molecules, higher selectivity towards monovalent ions, in addition to lower operating pressures and higher fluxes compared to RO membranes -promoted their adoption across a wide spectrum of applications, ranging from water and wastewater treatment [2,3,4] to food and textile engineering [5,6,7] as well as pharmaceutical and biotechnology applications [8,9,10]. A recent review by Mohammad et al…”

Section: Introductionmentioning

confidence: 99%

Fundamentals of low-pressure nanofiltration: Membrane characterization, modeling, and understanding the multi-ionic interactions in water softening

Labban

Liu

Chong

et al. 2017

Journal of Membrane Science

148

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Recently, a novel class of low-pressure nanofiltration (NF) hollow fiber membranes, particularly suited for water softening and desalination pretreatment have been fabricated in-house using layer-by-layer (LbL) deposition with chemical crosslinking. These membranes can operate at exceedingly low pressures (2 bar), while maintaining relatively high rejections of multivalent ions. In spite of their great potential, our understanding as to what makes them superior has been limited, demanding further investigation before any large-scale implementation can be realized. In this study, the Donnan-Steric Pore Model with dielectric exclusion (DSPM-DE) is applied for the first time to these membranes to describe the membrane separation performance, and to explain the observed rejection trends, including negative rejection, and their underlying multi-ionic interactions. Experiments were conducted on a spectrum of feed chemistries, ranging from uncharged solutes to single salts, salt mixtures, and artificial seawater to characterize the membrane and accurately predict its performance. Modeling results were validated with experiments, and then used to elucidate the working principles that underlie the low-pressure softening process. An approach based on sensitivity analysis shows that the membrane pore dielectric constant, followed by the pore size, are primarily responsible for the selectively high rejections of the NF membranes to multivalent ions. Surprisingly, the softening process is found to be less sensitive to changes in membrane charge density. Our findings demonstrate that the unique ability of these membranes to exclusively separate multivalent ions from the solution, while allowing monovalent ions to permeate, is key to making this low-pressure softening process realizable.

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Removal of arsenic from contaminated groundwater by membrane-integrated hybrid treatment system

Cited by 139 publications

References 20 publications

Removal of perfluorooctane sulfonates from water by a hybrid coagulation–nanofiltration process

Removal of perfluorooctane sulfonates from water by a hybrid coagulation–nanofiltration process

Arsenic Removal from Drinking Water by Self-Made PMIA Nanofiltration Membrane

Fundamentals of low-pressure nanofiltration: Membrane characterization, modeling, and understanding the multi-ionic interactions in water softening

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