AVMD™ Advanced Vacuum Membrane Distillation

Membrane distillation (MD) is a thermally driven process which allows water vapor transport through a hydrophobic porous membrane.

At Aquatech, we took this technology to next stage with our innovative process technology Advanced Vacuum Membrane Distillation (AVMD), a patent pending process. In AVMD, an applied vacuum pulls water vapor across the membranes and constantly recirculates brine without allowing salt crystals to reach the membrane. The AVMD process approach is to increase heat recovery & achieve high flux rates.

AVMD combines the advantages of multi effect & vacuum distillation with membrane treatment to achieve high product quality at a lower energy consumption. AVMD is particularly effective in applications where a significant CapEx advantage over conventional brine reduction technologies can be demonstrated, or where there is a recoverable product such as a solvent or valuable material which can be recycled back to an upstream industrial production process.

In conventional membrane distillation, membrane flux and distillate quality can be significantly affected when a solution reaches salt saturation and the membrane pores are flooded. AVMD overcomes this problem due to its innovative design that eliminates contact between the membrane and liquid/brine solution. Because of this design, membrane fouling is eliminated, leading to a consistently high flux and distillate quality, even at an elevated brine concentration.

AVMD Key Applications

  • Fine Chemicals and Intermediates
  • Food and Beverage
  • Pharmaceutical Applications
  • Semiconductors
  • Industrial Wastewater and Seawater

AVMD Key Features

  • Concentrates brine up to 32-35%
  • Salt rejection > 99.5- 99.9%
  • Low distillate TDS
  • High temperature resistant hydrophobic membrane
  • Durable membrane life.
  • Works on 70 – 90 °C feed temperature & 400- 500 mmHg vacuum
  • Consistent quality with brine/wastewater reduction
  • Consistently high flux

AVMD Advantages

  • Lower operating costs
  • Compact footprint as compared to traditional thermal distillation
  • Consistent distillate water quality even with a high brine concentration
  • Elimination of membrane fouling and low flux challenges of traditional membrane distillation
  • Recovery > 90% (depending on feed TDS)
  • Solvent and valuable product recovery if required
  • Integration option with solar/waste heat