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Comment Water Treatment

Vacuum-aided membrane distillation results in ultra-pure water

By Mary Page Bailey |

At Achema 2018 (June 11–15; Frankfurt am Main, Germany), EvCon GmbH (Pliening-Landsham, Germany; www.evcon-water.com) showcased its new UPWater treatment system, which employs a patented vacuum multi-effect membrane distillation (VMEMD) technology to obtain ultra-pure water using less energy than comparable water-treatment processes. VMEMD uses a hydrophobic membrane constructed of corrosion-resistant plastics with 0.1- to 0.5-μm pores fine-tuned to be permeable only to high-purity steam. The membrane selectively rejects any impurities in the feedwater stream along with the water itself. At vacuum conditions, water and pure steam are passed through different membrane stages, or effects (diagram). The steam and water progressively condense and evaporate as they pass through the system, and as more water impurities are trapped by the membranes, a stream of pure water is created. Steam flows through the system efficiently due to the pressure and temperature differentials between the membrane effects, which also help to induce controlled condensation. “The heating steam condenses, transferring its heat to the feed, which is evaporated. Steam is collected within the effect and is used for heating in the next step,” says Norbert…
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