Experimental study of the memsys vacuum-multi-effect-membrane-distillation (V-MEMD) module

Zhao, Kuangmin; Heinzl, Wolfgang; Wenzel, Markus; Büttner, Sebastian; Bollen, F.; Lange, Götz; Heinzl, S.; Sarda, N.

doi:10.1016/j.desal.2012.12.003

Cited by 172 publications

(84 citation statements)

References 9 publications

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“…Srisurichan [29] found that HA fouling was easily removed with a 0.1 M NaOH solution, while still achieving full recovery of permeate flux. Alternating temperature changes, in one case between 25 °C and 35 °C, was found to clean HA as well, resulting in a flux recovery of 98.2% with proven repeatability [97].…”

Section: Natural Organic Matter (Nom) In MDmentioning

confidence: 98%

“…Temperature increase causes the decomposition of HA and other biological compounds. In fact, for RO membrane systems, temperature increase may be used as an effective cleaning method for HA [97]. However, for MD at higher temperatures, permeate flux increases: this may lead to higher concentration of organic compounds at the membrane interface due to the concentration polarization effect.…”

Section: Temperaturementioning

confidence: 99%

“…For example, the addition of multivalent cations increases the electrolyte or ionic strength of the feed water and can favor the aggregation of the HA and therefore the fouling [96]. Divalent ions, including Ca 2+ , act as binding agents to the carboxyl functional groups reducing the charge and the electrostatic repulsion between macromolecules and encouraging particulate precipitation [25,97]. HA at 100mg/L concentration in a MD study with added CaCl 2 at 3.775 mM caused significant flux reduction of 40% on flat-sheet membranes [29].…”

Section: Natural Organic Matter (Nom) In MDmentioning

confidence: 99%

See 2 more Smart Citations

Scaling and fouling in membrane distillation for desalination applications: A review

et al. 2015

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Section: Natural Organic Matter (Nom) In MDmentioning

confidence: 98%

Section: Temperaturementioning

confidence: 99%

Section: Natural Organic Matter (Nom) In MDmentioning

confidence: 99%

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Scaling and fouling in membrane distillation for desalination applications: A review

et al. 2015

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“…All of these configurations have been investigated in bench scale and found to be applicable to various matrices such as separation of non-volatiles like ions, macromolecules, cells, colloids [12][13][14][15], the removal of trace volatile organics [16][17][18][19], concentration of oil-water emulsions, acids and juice [20][21][22], biomedical applications [23,24], desalination and waste water treatment [1][2][3][25][26][27][28][29]. Most of the bench scale work has been done with DCMD module, but recent pilot scale studies focused on AGMD and VMD configurations [30][31][32][33]. It is important to mention that in DCMD, the product is mixed with the coolant, whereas in AGMD there is the presence of a stagnant air layer between the membrane and the condensation surface so that any water type quality (e.g.…”

Section: Introductionmentioning

confidence: 99%

Material gap membrane distillation: A new design for water vapor flux enhancement

Francis

Ghaffour

Alsaadi

et al. 2013

Journal of Membrane Science

181

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A new module design for membrane distillation, namely material gap membrane distillation (MGMD), for seawater desalination has been proposed and successfully tested. It has been observed that employing appropriate materials between the membrane and the condensation plate in an air gap membrane distillation (AGMD) module enhanced the water vapor fluxsignificantly. An increase in the water vapor flux of about 200% to 800 % was observed by filling the gap with sand and DI water at various feed water temperatures. However, insulating materials such as polypropylene and polyurethane have no effect on the water vapor flux. The influence of material thickness and characteristics has also been investigated in this study. An increase in the water gap width from 9 mm to 13 mm increases the water vapor flux. An investigation on an AGMD and MGMD performance comparison, carried out using two different commercial membranes provided by different manufacturers, is also reported in this paper.

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“…However, the comparison is limited for small systems, as MSF and MED systems of the types modeled change dramatically at small sizes, reducing the number of stages to 2-3 for the few installations below 1000 m 3 /day [49]. The RO model is not always applicable below 50 m 3 /day as these plants may lack pressure recovery [48], and some instances of HDH and multistage membrane distillation systems can be extremely small, with real systems below even 1 m 3 /day, while still providing GOR values similar to those in this paper [50].…”

Section: Applicability Of Analysis To Systems Of Different Costs and mentioning

confidence: 99%

Entropy Generation of Desalination Powered by Variable Temperature Waste Heat

Warsinger

Mistry

Nayar

et al. 2015

Entropy

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Powering desalination by waste heat is often proposed to mitigate energy consumption and environmental impact; however, thorough technology comparisons are lacking in the literature. This work numerically models the efficiency of six representative desalination technologies powered by waste heat at 50, 70, 90, and 120• C, where applicable. Entropy generation and Second Law efficiency analysis are applied for the systems and their components. The technologies considered are thermal desalination by multistage flash (MSF), multiple effect distillation (MED), multistage vacuum membrane distillation (MSVMD), humidification-dehumidification (HDH), and organic Rankine cycles (ORCs) paired with mechanical technologies of reverse osmosis (RO) and mechanical vapor compression (MVC). The most efficient technology was RO, followed by MED. Performances among MSF, MSVMD, and MVC were similar but the relative performance varied with waste heat temperature or system size. Entropy generation in thermal technologies increases at lower waste heat temperatures largely in the feed or brine portions of the various heat exchangers used. This occurs largely because lower temperatures reduce recovery, increasing the relative flow rates of feed and brine. However, HDH (without extractions) had the reverse trend, only being competitive at lower temperatures. For the mechanical technologies, the energy efficiency only varies with temperature because of the significant losses from the ORC.Entropy 2015, 17 7531

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Experimental study of the memsys vacuum-multi-effect-membrane-distillation (V-MEMD) module

Cited by 172 publications

References 9 publications

Scaling and fouling in membrane distillation for desalination applications: A review

Scaling and fouling in membrane distillation for desalination applications: A review

Material gap membrane distillation: A new design for water vapor flux enhancement

Entropy Generation of Desalination Powered by Variable Temperature Waste Heat

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