Boron removal and desalination from seawater by PVDF flat-sheet membrane through direct contact membrane distillation

Hou, Deyin; Dai, Guohua; Wang, Jun; Fan, Hongsong; Luan, Zhaokun; Fu, Chaochen

doi:10.1016/j.desal.2013.07.023

Cited by 62 publications

(29 citation statements)

References 39 publications

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“…However, the salt rejection was higher than 99.9% under each operation temperature. Based on the performance under different temperature, a comparison with the flat-sheet membranes reported in the recent four years was carried out and listed in Table 6 [31,[48][49][50][51][52][53][54][55][56][57][58][59][60][61]. It can be found that the PVDF-CTFE membrane prepared in this work presented higher permeate flux in MD desalination application except PES and PSf membranes modified by CF4 plasma.…”

Section: Comparison With Other Flat-sheet MD Membranesmentioning

confidence: 99%

Preparation of PVDF-CTFE hydrophobic membranes for MD application: Effect of LiCl-based mixed additives

Zheng

Wei

et al. 2016

Journal of Membrane Science

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a b s t r a c tHydrophobic flat-sheet membranes were prepared by poly (vinylidene fluoride-co-chlorotrifluoroethylene) (PVDF-CTFE) via the non-solvent induced phase separation (NIPS) process for membrane distillation (MD) application. Different types of LiCl-based mixed additives were applied to investigate their effects on membrane properties and MD performance. The membranes were evaluated in terms of membrane morphology, pore size and distribution, porosity, surface roughness, hydrophobicity, as well as the direct contact membrane distillation (DCMD) performance. Clear evidences were obtained that the mixed additives altered the phase inversion process, which resulted in the variation in membrane morphology, structure, properties and performance. The mass ratio of PEG/LiCl ranging from 5:0 to 0:5 was comprehensively investigated to study the synergistic effects of two additives on PVDF-CTFE membranes. The membrane M5 (PEG:LiCl ¼1:1, total content 8 wt% ) showed optimal properties and MD performance for combining the structure of higher hydrophobicity and pore interconnectivity, small pore size and narrow pore size distribution. The addition of LiCl to PEG-containing solutions benefited the solid-liquid demixing process, which increased the hydrophobicity, porosity, pore interconnectivity, and MD performance of the resultant membranes. While added PEG to LiCl-containing solutions showed slightly influences. Furthermore, it was also found that PVP/LiCl and glycerol/LiCl were not suitable for hydrophobic membrane preparation as they strikingly reduced membrane hydrophobicity. While H 3 PO 4 and H 2 O were confirmed suitable to mix with LiCl for hydrophobic PVDF-CTFE membrane preparation.

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Section: Comparison With Other Flat-sheet MD Membranesmentioning

confidence: 99%

Preparation of PVDF-CTFE hydrophobic membranes for MD application: Effect of LiCl-based mixed additives

Zheng

Wei

et al. 2016

Journal of Membrane Science

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“…The pore size distribution and the liquid entry pressure, LEP, of each membrane were determined with a capillary flow porometer (Poroflux 1000, IB-GT GmbH, Germany) [50][51][52][53]. In addition, the chemical composition of each membrane surface was confirmed via polarization modulation-infrared reflection-adsorption spectroscopy, or PM-IRRAS (PMA 50, Bruker, Billerica, MA).…”

Section: Characterizations Of Morphology and Wetting Propertymentioning

confidence: 99%

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Wang

Jin

Hou

et al. 2016

Journal of Membrane Science

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127

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a b s t r a c tThe efforts of developing anti-oil-fouling membranes have so far been focusing on tailoring membrane surface wetting properties, whereas the impacts of surface charge are often eclipsed. In this study, we investigated the impacts of surface charge and wetting property on oil fouling kinetics in membrane distillation (MD). Two composite membranes with in-air hydrophilic and underwater oleophobic surfaces, one of positive charge and the other of negative charge, were fabricated by modifying a hydrophobic polyvinylidene fluoride (PVDF) membrane with hydrophilic polyelectrolytes with different charges. The modified composite membranes were compared with the reference PVDF membrane for their contact angles, adhesion force curves, and fouling kinetics in MD processes. It was found that the negatively charged composite membrane performed the best in mitigating fouling by the negatively charged oil emulsion, followed by the positively charged composite membrane, with the pristine PVDF membrane being the most susceptible to oil fouling in MD experiments. The results from underwater oil CA measurements and oil probe force spectroscopy corroborated the results in the fouling experiments. The impact of surface charges on oil-membrane interaction and associated mechanism were also discussed.

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“…Although B is required for all plant growth, at high levels B is toxic to plants and animals (1 to 2 m/L) [128]. Figure 11 shows the dissolved Si content in Fields A, B and C and is represented by a range of 13 -23 mg/L.…”

Section: Fluoride and Bromide Ionsmentioning

confidence: 99%

“…Pre-treatment methods for the removal of B prior to CS water being treated by RO may include adsorption or ion exchange. Adsorption as a treatment technology is limited by pH, temperature, and the properties of adsorbent used, however it is cost effective and can remove B to a low concentration (<0.05 mg/L) [128]. RO membranes and ion exchange together have also been found to be beneficial for B removal to reduce the cost associated with RO membranes alone [126].…”

Section: Fluoride and Bromide Ionsmentioning

confidence: 99%

“…There exist several treatment methods that can be used to remove F -and Br -in CS water prior to RO and these include chemical adsorption or precipitation, ion exchange, or by selection of appropriate RO membranes [121,124]. The removal of B in a typical desalination process has been shown to be difficult depending on the treatment technology used [126][127][128]. RO operation has shown that the optimal removal of B is dependent on pH, amount of passes of the water through the RO membrane and the type of commercial membrane used.…”

Section: Fluoride and Bromide Ionsmentioning

confidence: 99%

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Coal Seam Gas Water Quality and Impacts on Downstream Treatment Technologies

Rebello¹

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The coal seam gas (CSG) industry in Australia is of significant importance economically, especially in Queensland where a substantial increase in the amount of gas extracted over the past six years has occurred. CSG formation, relation to local geological features, extraction approach and the potential impact/benefits of coal seam (CS) water has been considered by reviewing the location of CSG wells in relation to each other, the depth of the well in relation to the coal seam with which the CSG is associated, and the quality of the CS water compared with the requirements for each beneficial use application. An outline of the limited current legislative requirements on physical and chemical properties of CS water as regulated by the Queensland Government is provided, as well as the current treatment technologies used by the major CSG companies to ensure compliance with these requirements. Water quality from 150 CSG production wells from the Surat Basin, Queensland has been analysed and compared within and between multiple gas fields in a small geographic area prior to any storage, disposal and treatment. Chemical analysis revealed the CS water to have high bicarbonate, high sodium, and low calcium, low magnesium and very low sulfate concentrations. The chemical analysis also confirmed that the pre-treatment concentration levels of specific parameters such as sodium, chloride, total dissolved solids, and sodium adsorption ratio were above that required for use by agricultural and industrial sectors, therefore requiring treatment prior to use. This study has shown that the amount of each type of mineral that comprises coal, such as clay, sulfide ores, oxide ores, quartz and phosphates, may explain the water quality patterns by assessing the mineral content of the associated CS water in relation to the chemical composition of Surat Basin coal

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Boron removal and desalination from seawater by PVDF flat-sheet membrane through direct contact membrane distillation

Cited by 62 publications

References 39 publications

Preparation of PVDF-CTFE hydrophobic membranes for MD application: Effect of LiCl-based mixed additives

Preparation of PVDF-CTFE hydrophobic membranes for MD application: Effect of LiCl-based mixed additives

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Coal Seam Gas Water Quality and Impacts on Downstream Treatment Technologies

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