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Advances in Water Desalination
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Advances in Water Desalination

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Water Use and Scarcity".

Deadline for manuscript submissions: closed (1 July 2012) | Viewed by 117811

Special Issue Editor

Prof. Dr. Thomas A. Davis

E-Mail Website
Guest Editor
Center for Inland Desalination Systems, The University of Texas at El Paso, El Paso, TX 79968, USA

Special Issue Information

Dear Colleagues,

Desalination of seawater and brackish groundwater has taken on an enhanced interest as droughts in various parts of the world have caused local water shortage. In other regions there is a chronic shortage of water, and the growth of tourism, business or harvesting of natural resources can be carried out only with desalination to supplement scarce existing water resources.

Desalination is an expanding business with continuing evolution in technology. Reverse osmosis (RO) is the dominant technology for new desalination plants, but there are still innovations that drive down cost and improve energy efficiency and water yield in RO systems. Further, there is continuing research on new technologies and ways to adapt older technologies (e.g. thermally and electrically driven) to the new challenges of reducing energy cost and management of concentrated salt solutions that are a byproduct of desalination. Concentrate management is especially important for inland desalination plants for which the option is not available for disposal of concentrate into the ocean. In some cases the concentrate has marketable salts if they can be isolated and purified.

In this special issue entitled “Advances in Water Desalination” authors have the opportunity to publish papers on their contributions to desalination technology. Manuscripts are welcome in the following areas.

  • Pretreatment
  • New membranes
  • Innovative desalination processes
  • Concentrate management

Prof. Dr. Thomas A. Davis
Guest Editor

Keywords

  • Desalination
  • Reverse osmosis
  • Electrodialysis
  • Evaporation
  • Membrane distillation
  • Pretreatment
  • Concentrate

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Published Papers (6 papers)

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Research

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415 KiB  
Article
Enzymatic Modification of Polyethersulfone Membranes
by Norhan Nady, Maurice Charles René Franssen, Han Zuilhof, Remko Marcel Boom and Karin Schroën
Water 2012, 4(4), 932-943; https://doi.org/10.3390/w4040932 - 16 Nov 2012
Cited by 9 | Viewed by 8826
Abstract
Enzymatic modification of polyethersulfone (PES) membranes has been found not only feasible, but also an environmentally attractive way to vary surface properties systematically. In this paper, we summarize the effect of modification layers on protein adsorption and bacterial adhesion on PES membranes and [...] Read more.
Enzymatic modification of polyethersulfone (PES) membranes has been found not only feasible, but also an environmentally attractive way to vary surface properties systematically. In this paper, we summarize the effect of modification layers on protein adsorption and bacterial adhesion on PES membranes and surfaces. The enzyme laccase was used to covalently bind (poly)phenolic acids to the membrane, and compared to other membrane modification methods, this method is very mild and did not influence the mechanical strength negatively. Depending on the conditions used during modification, the modification layers were capable of influencing interactions with typical fouling species, such as protein, and to influence attachment of microorganisms. We also show that the modification method can be successfully applied to hollow fiber membranes; and depending on the pore size of the base membrane, proteins were partially rejected by the membrane. In conclusion, we have shown that enzymatic membrane modification is a versatile and economically attractive method that can be used to influence various interactions that normally lead to surface contamination, pore blocking, and considerable flux loss in membranes. Full article
(This article belongs to the Special Issue Advances in Water Desalination)
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508 KiB  
Article
An Experimental Investigation on Inclined Negatively Buoyant Jets
by Raed Bashitialshaaer, Magnus Larson and Kenneth M. Persson
Water 2012, 4(3), 720-738; https://doi.org/10.3390/w4030720 - 24 Sep 2012
Cited by 24 | Viewed by 9648
Abstract
An experimental study was performed to investigate the behavior of inclined negatively buoyant jets. Such jets arise when brine is discharged from desalination plants. A turbulent jet with a specific salinity was discharged through a circular nozzle at an angle to the horizontal [...] Read more.
An experimental study was performed to investigate the behavior of inclined negatively buoyant jets. Such jets arise when brine is discharged from desalination plants. A turbulent jet with a specific salinity was discharged through a circular nozzle at an angle to the horizontal into a tank with fresh water and the spatial evolution of the jet was recorded. Four different initial jet parameters were changed, namely the nozzle diameter, the initial jet inclination, the jet density and the flow rate. Five geometric quantities describing the jet trajectory that are useful in the design of brine discharge systems were determined. Dimensional analysis demonstrated that the geometric jet quantities studied, if normalized with the jet exit diameter, could be related to the densimetric Froude number. Analysis of the collected data showed that this was the case for a Froude number less than 100, whereas for larger values of the Froude number the scatter in the data increased significantly. As has been observed in some previous investigations, the slope of the best-fit straight line through the data points was a function of the initial jet angle (θ), where the slope increased with θ for the maximum levels (Ym) studied, but had a more complex behavior for horizontal distances. Full article
(This article belongs to the Special Issue Advances in Water Desalination)
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351 KiB  
Article
Comparison of Configurations for High-Recovery Inland Desalination Systems
by Tianyu Qiu and Philip A. Davies
Water 2012, 4(3), 690-706; https://doi.org/10.3390/w4030690 - 17 Sep 2012
Cited by 88 | Viewed by 11467
Abstract
Desalination of brackish groundwater (BW) is an effective approach to augment water supply, especially for inland regions that are far from seawater resources. Brackish water reverse osmosis (BWRO) desalination is still subject to intensive energy consumption compared to the theoretical minimum energy demand. [...] Read more.
Desalination of brackish groundwater (BW) is an effective approach to augment water supply, especially for inland regions that are far from seawater resources. Brackish water reverse osmosis (BWRO) desalination is still subject to intensive energy consumption compared to the theoretical minimum energy demand. Here, we review some of the BWRO plants with various system arrangements. We look at how to minimize energy demands, as these contribute considerably to the cost of desalinated water. Different configurations of BWRO system have been compared from the view point of normalized specific energy consumption (SEC). Analysis is made at theoretical limits. The SEC reduction of BWRO can be achieved by (i) increasing number of stages, (ii) using an energy recovery device (ERD), or (iii) operating the BWRO in batch mode or closed circuit mode. Application of more stages not only reduces SEC but also improves water recovery. However, this improvement is less pronounced when the number of stages exceeds four. Alternatively and more favourably, the BWRO system can be operated in Closed Circuit Desalination (CCD) mode and gives a comparative SEC to that of the 3-stage system with a recovery ratio of 80%. A further reduction of about 30% in SEC can be achieved through batch-RO operation. Moreover, the costly ERDs and booster pumps are avoided with both CCD and batch-RO, thus furthering the effectiveness of lowering the costs of these innovative approaches. Full article
(This article belongs to the Special Issue Advances in Water Desalination)
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217 KiB  
Article
The Ability of a Nanofiltration Membrane to Remove Hardness and Ions from Diluted Seawater
by Amir Abbas Izadpanah and Asghar Javidnia
Water 2012, 4(2), 283-294; https://doi.org/10.3390/w4020283 - 23 Mar 2012
Cited by 58 | Viewed by 13177
Abstract
In this work, the ability of a commercial spiral-wound nanofiltration membrane to remove hardness and ions from diluted seawater was studied. Experiments were carried out in the pressure range of 4–10 bar. Analyses of the samples, and permeates at different pressures, were performed [...] Read more.
In this work, the ability of a commercial spiral-wound nanofiltration membrane to remove hardness and ions from diluted seawater was studied. Experiments were carried out in the pressure range of 4–10 bar. Analyses of the samples, and permeates at different pressures, were performed and the effects of the trans-membrane pressure on the permeate flux were investigated. The results show that this nanofiltration membrane is capable of retaining 96–98% of the total hardness, 79–89% of the electrical conductivity and 79–89% of the total dissolved solid (TDS). Our results are in good agreement with those reported by the manufacturing company. Full article
(This article belongs to the Special Issue Advances in Water Desalination)
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Review

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4311 KiB  
Review
Advances in Membrane Distillation for Water Desalination and Purification Applications
by Lucy Mar Camacho, Ludovic Dumée, Jianhua Zhang, Jun-de Li, Mikel Duke, Juan Gomez and Stephen Gray
Water 2013, 5(1), 94-196; https://doi.org/10.3390/w5010094 - 25 Jan 2013
Cited by 681 | Viewed by 55674
Abstract
Membrane distillation is a process that utilizes differences in vapor pressure to permeate water through a macro-porous membrane and reject other non-volatile constituents present in the influent water. This review considers the fundamental heat and mass transfer processes in membrane distillation, recent advances [...] Read more.
Membrane distillation is a process that utilizes differences in vapor pressure to permeate water through a macro-porous membrane and reject other non-volatile constituents present in the influent water. This review considers the fundamental heat and mass transfer processes in membrane distillation, recent advances in membrane technology, module configurations, and the applications and economics of membrane distillation, and identifies areas that may lead to technological improvements in membrane distillation as well as the application characteristics required for commercial deployment. Full article
(This article belongs to the Special Issue Advances in Water Desalination)
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1315 KiB  
Review
Microporous Silica Based Membranes for Desalination
by Muthia Elma, Christelle Yacou, David K. Wang, Simon Smart and João C. Diniz da Costa
Water 2012, 4(3), 629-649; https://doi.org/10.3390/w4030629 - 3 Sep 2012
Cited by 95 | Viewed by 17277
Abstract
This review provides a global overview of microporous silica based membranes for desalination via pervaporation with a focus on membrane synthesis and processing, transport mechanisms and current state of the art membrane performance. Most importantly, the recent development and novel concepts for improving [...] Read more.
This review provides a global overview of microporous silica based membranes for desalination via pervaporation with a focus on membrane synthesis and processing, transport mechanisms and current state of the art membrane performance. Most importantly, the recent development and novel concepts for improving the hydro-stability and separating performance of silica membranes for desalination are critically examined. Research into silica based membranes for desalination has focussed on three primary methods for improving the hydro-stability. These include incorporating carbon templates into the microporous silica both as surfactants and hybrid organic-inorganic structures and incorporation of metal oxide nanoparticles into the silica matrix. The literature examined identified that only metal oxide silica membranes have demonstrated high salt rejections under a variety of feed concentrations, reasonable fluxes and unaltered performance over long-term operation. As this is an embryonic field of research several target areas for researchers were discussed including further improvement of the membrane materials, but also regarding the necessity of integrating waste or solar heat sources into the final process design to ensure cost competitiveness with conventional reverse osmosis processes. Full article
(This article belongs to the Special Issue Advances in Water Desalination)
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