Vacuum Membrane Distillation Equipment

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Fundamentals membrane materials and key operations.

Vacuum membrane distillation equipment.

Microporous hydrophobic membranes are used to separate the aqueous stream from a gas phase kept under vacuum. Vacuum membrane distillation membrane contactors. Desalination concentration in food industries acid manufacturing removing organic and heavy metals treating radioactive waste. In one example brine is circulated in a tank.

In this case condensation takes place outside of the membrane module. The flow diagram of the vmd system. This md con uration is termed vacuum membrane distillation vmd. The tank may include one or more membrane pouches that are submerged in the circulating brine or placed above the water level of.

Abstract vacuum membrane distillation is a membrane based separation process considered here to remove volatile organic compounds from aqueous streams. On the other hand membrane. Modelling of pore wetting in membrane distillation compared with pervaporation. Membrane distillation md is a thermally driven separation process in which separation is driven by phase change a hydrophobic membrane presents a barrier for the liquid phase allowing the vapour phase e g.

The driving force of the process is a partial vapour pressure difference commonly triggered by a temperature difference. In this method the driving force is the vacuum applied at the permeate side of the membrane by a vacuum pump. Ii vacuumisappliedinthepermeatesideofthe membrane module by means of a vacuum pump theappliedvacuumpressureislower than the saturation pressure of volatile molecules to be separated from the feed solution. Vacuum membrane distillation vmd.

Although vacuum membrane distillation vmd has a high distillate flux its potential is limited by its high specific heat consumption shc. Embodiments provide methods and structures for purification or volume reduction of a brine by an advanced vacuum distillation process avmd to achieve higher flux by passage of vapors through an avmd distillation unit. 1 2 future development membrane distillation is an alternative to the traditional evaporative distillation systems used for desalination or water purification processes. Water vapour to pass through the membrane s pores.

Integrated systems involving. Hollow fiber vmd systems however have not yet been optimized for energy recovery. Flat sheet vmd systems recover the brine energy by employing a cascade system to improve the shc. Different configurations for example gas gap membrane distillation or vacuum membrane distillation will be considered in the next sections.

Exergy analysis of a vacuum membrane distillation system integrated with mechanical vapor recompression for sulfuric acid waste treatment 1.

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