Analysis of reverse osmosis membrane performance during desalination of simulated brackish surface waters

Sachit, Dawood Eisa; Veenstra, John N.

doi:10.1016/j.memsci.2013.10.051

Cited by 48 publications

(31 citation statements)

References 42 publications

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“…On the other hand, inorganic retention was not influenced by feed water quality. RO showed a high rejection for all ions (>90%), decreasing feed conductivity to as low as 40–87 μS/cm, supporting previous studies . In contrast, NF presented a moderate to high retention for multivalent ions (67–100%) but monovalent ions were only partially retained (14–61%), as other authors previously reported .…”

Section: Resultssupporting

confidence: 90%

Nanofiltration/Reverse Osmosis as Pretreatment Technique for Water Reuse: Ultrafiltration Versus Tertiary Membrane Reactor

Díaz

Cabrera

Vera

et al. 2017

CLEAN Soil Air Water

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The potential for nanofiltration (NF) and reverse osmosis (RO) in secondary effluent reclamation is noteworthy, but both processes require extensive pre‐treatment to prevent membrane fouling and promote system longevity. In this study, performance of direct ultrafiltration (UF) and tertiary membrane bioreactors (tMBRs) as feed pre‐treatments were assessed on a pilot scale. Both technologies achieved high organic matter removal (87 and 93% for UF and tMBR, respectively). Differences in efficiencies were related to suspended biomass in the tMBR, which enhanced degradation of the dissolved organic substances (<5 mg/L) and also stabilized process performance by minimizing residual fouling. Whichever pre‐treatment was applied, RO reached higher rejection coefficients and low fouling levels. Nevertheless, lower normalized flux (12%) was achieved when the UF effluent was fed due to high concentration of organic substances. Membrane autopsies by scanning electron microscopy with dispersive X‐ray and Fourier transform IR spectroscopy revealed that organic fouling appears to be predominant on both NF/RO membranes. The main organic foulants identified were polysaccharides and proteins. Inorganic foulants mainly consisted of calcium, phosphorus, and iron. Complete removal of pharmaceutical active compounds was observed for RO, while NF presented moderate retention coefficients (94, 85, 70, and 27% for atenolol, paraxanthine, caffeine and clofibric acid, respectively).

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Section: Resultssupporting

confidence: 90%

Nanofiltration/Reverse Osmosis as Pretreatment Technique for Water Reuse: Ultrafiltration Versus Tertiary Membrane Reactor

Díaz

Cabrera

Vera

et al. 2017

CLEAN Soil Air Water

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“…Nanofiltration and reverse osmosis are well-established technologies mainly in water treatment, removal and concentration of organics components [1][2][3], as well as in sea water desalination, water purification, and other manufacturing separations [4,5]. Recently, these membranes have been considered as a sustainable alternative for separation and purification processes also in nonaqueous systems.…”

Section: Introductionmentioning

confidence: 99%

Impact of Organic Solvents on Physicochemical Properties of Nanofiltration and Reverse‐Osmosis Membranes

et al. 2019

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Polymeric membranes subjected to the permeation of n‐hexane were characterized and the influence of pretreatment with ethanol on the properties of the membranes was studied to assess membrane performance and stability. The results suggest that the selectivity of the membrane depends not only on the pore size, but also to a great extent on the interaction between solvent and polymer. An increase in membrane roughness and contact angle was observed for all membranes after pretreatment with ethanol and n‐hexane permeation. Moreover, the surface free energy decreased after solvents exposure, indicating an increase in membrane surface hydrophobicity and polymer swelling. The studied membranes show feasibility of use for the recovery of solvents, if suitable process parameters are selected.

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“…On the other hand, water demand has increased due to the population growth. Semiarid regions, in general, do not have superficial water, like rivers and lakes, so the use of underground brackish water becomes an alternative (Sachit & Veenstra, 2014).…”

Section: Introductionmentioning

confidence: 99%

Lettuce growth and water consumption in NFT hydroponic system using brackish water

Soares

Silva

et al. 2015

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe qualitative aspects of water, such as the preparation or replenishment of the nutrient solution, are critical to the success of hydroponic crops. Therefore, the aim of this study was to evaluate the behavior of "Americana" lettuce (cv. Tainá) under increasing levels of saline stress (0.2 -control, 1.2, 2.2, 3.2, 4.2 and 5.2 dS m -1 ), replenishing the evapotranspiration with brackish water in Experiment I and supply water (0.2 dS m -1 ) in Experiment II, both used in the preparation of the nutrient solution. In both experiments, the treatments were arranged in a randomized block design, with six treatments and four replicates. Shoot fresh matter, shoot dry matter and leaf area in Experiment I suffered reductions of 15.22, 12.67 and 15.6% per unit increase of EC, respectively. In Experiment II, reductions of 8.01, 6.90 and 8.14% were observed for the same variables, respectively. In Experiments I and II, linear decrease in water consumption due to the increase in salinity was observed, with reductions of 8.83 and 5.63% for each unit increase of electrical conductivity of water when the evapotranspiration was replenished using brackish and supply water, respectively.Crescimento e consumo hídrico de alface americana cultivada com águas salobras em sistema hidropônico R E S U M O Os aspectos qualitativos da água quanto ao preparo ou reposição da solução nutritiva são fundamentais para o sucesso de cultivos hidropônicos. Portanto, o objetivo do presente trabalho foi avaliar o comportamento da alface americana (cv. Tainá) sob níveis crescentes de estresse salino (0,2 -testemunha, 1,2, 2,2, 3,2, 4,2 e 5,2 dS m -1 ) com reposição da lâmina evapotranspirada usando a água salobra utilizada no preparo da solução no Experimento I ou com água de abastecimento (0,2 dS m -1 ) no Experimento II. Em ambos os experimentos os tratamentos foram distribuídos em um delineamento experimental em blocos ao acaso com seis tratamentos e com quatro repetições. As massas fresca e seca da parte aérea e a área foliar no Experimento I sofreram reduções de 15,22, 12,67 e 15,6%, por incremento unitário da condutividade elétrica, respectivamente. No Experimento II foram constatadas reduções de 8,01, 6,90 e 8,14%, para as massas fresca e seca da parte aérea e área foliar, respectivamente. Verificou-se, nos Experimentos I e II, diminuição linear do consumo hídrico em função do aumento da salinidade, com reduções percentuais de 8,83 e 5,63% por incremento unitário da condutividade elétrica da água utilizada no preparo da solução nutritiva, nas resposição com águas salobra e doce, respectivamente.

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Analysis of reverse osmosis membrane performance during desalination of simulated brackish surface waters

Cited by 48 publications

References 42 publications

Nanofiltration/Reverse Osmosis as Pretreatment Technique for Water Reuse: Ultrafiltration Versus Tertiary Membrane Reactor

Nanofiltration/Reverse Osmosis as Pretreatment Technique for Water Reuse: Ultrafiltration Versus Tertiary Membrane Reactor

Impact of Organic Solvents on Physicochemical Properties of Nanofiltration and Reverse‐Osmosis Membranes

Lettuce growth and water consumption in NFT hydroponic system using brackish water

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