Nanofiltration as energy-efficient solution for sulfate waste in vacuum salt production

Bargeman, Gerrald; Steensma, M.; Kate, Antoon ten; Westerink, J.B.; Demmer, R.L.M.; Bakkenes, Henk W.; Manuhutu, C.F.H.

doi:10.1016/j.desal.2009.02.009

Cited by 39 publications

(16 citation statements)

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“…The pores are typically near 1 nm in diameter and have fixed charges. Due to these characteristics, NF membranes retain multivalent complex ions and permeate small uncharged solutes and low charged ions [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Nanofiltration separation of polyvalent and monovalent anions in desalination brines

Pérez-González

Ibáñez

Gómez³

et al. 2015

Journal of Membrane Science

152

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This work, as part of a global membrane process for the recovery of alkali and acids from reverse osmosis (RO) desalination brines, focuses on the nanofiltration (NF) separation of polyvalent and monovalent anions, more specifically sulfate and chloride. This pretreatment stage plays a key role in the whole recovery process. Working with model brines simulating the concentration of RO concentrates, 0.2-1.2M chloride concentration and 0.1M sulfate concentration, the experimental performance and modeling of the NF separation is reported. The study has been carried out with the NF270 (Dow Filmtec) membrane. The effect of operating pressure (500-2000 kPa), ionic strength (0.4-1.3 M) and chloride initial concentration (0.2-1.2 M) on the membrane separation capacity has been investigated. Finally, the Donnan Steric Pore Model (DSPM) together with experimentally determined parameters: effective pore radius (); thickness of the membrane effective layer (į) and effective membrane charge density (), was proved accurate enough to satisfactorily describe the experimental results. In this work we provide for the first time the analysis of partitioning effects and transport mechanism in the NF separation of sulfate and chloride anions in concentrations that simulate those found in RO desalination brines.

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Section: Introductionmentioning

confidence: 99%

Nanofiltration separation of polyvalent and monovalent anions in desalination brines

Pérez-González

Ibáñez

Gómez³

et al. 2015

Journal of Membrane Science

152

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“…Furthermore, the pore size of NF membranes is affected by the ionic strength of the medium; therefore, the molecular weight cutoffs of the membranes differ in the presence of different solutions (Hong and Elimelech, 1997). By assessing different NF membranes used for sulfate retention in brine, Bargeman et al (2009) also observed lower retention capacity for MPF34 in comparison to NF270.…”

Section: Evaluation Of Different Nf and Ro Membranesmentioning

confidence: 91%

Nanofiltration and Reverse Osmosis Applied to Gold Mining Effluent Treatment and Reuse

Andrade

Aguiar

Pires

et al. 2017

Braz. J. Chem. Eng.

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-Gold mining and ore processing are activities of great economic importance. However, they are related to generation of extremely polluted effluents containing high concentrations of heavy metals and low pH. This study aims to evaluate the optimal conditions for gold mining effluent treatment by crossflow membrane filtration regarding the following variables: nanofiltration (NF) and reverse osmosis (RO) membrane types, feed pH and permeate recovery rate. It was observed that retention efficiencies of NF90 were similar to those of RO membranes though permeate fluxes obtained were 7-fold higher. The optimum pH value was found to be 5.0, which resulted in higher permeate flux and lower fouling formation. At a recovery rate above 40% there was a significant decrease in permeate quality, so this was chosen as the maximum recovery rate for the proposed system. We conclude that NF is a suitable treatment for gold mining effluent at an estimated cost of US$ 0.83/m³.

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“…Another application that NF has been proven useful for is zero liquid discharge (ZLD), especially for sulfate-rich industrial waste water. In most cases this waste water enters the NF system at 30-50 o C and sodium sulfate crystals are produced by NF or hybrid NF-evaporative crystallizer systems in a manner considered to be industrially attractive [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Factors contributing to the change in permeate quality upon temperature variation in nanofiltration

Roy

Lienhard

2019

Desalination

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Nanofiltration as energy-efficient solution for sulfate waste in vacuum salt production

Cited by 39 publications

References 1 publication

Nanofiltration separation of polyvalent and monovalent anions in desalination brines

Nanofiltration separation of polyvalent and monovalent anions in desalination brines

Nanofiltration and Reverse Osmosis Applied to Gold Mining Effluent Treatment and Reuse

Factors contributing to the change in permeate quality upon temperature variation in nanofiltration

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