Pass-through distillation for wastewater

Steve Furlong, Drystill, Mississauga, Ontario, Canada

Challenge area: Wastewater-free chemical sites

Drystill is innovating thermal evaporation technology with its Stripping Absorption Module (SAM), a pioneering heat and mass transfer device. SAM can remove water from almost any stream or water source without heating it or putting it in contact with a drying material.

Conventional thermal evaporation of industrial waste has a high carbon footprint and costs. SAM offers a practical, low cost, low carbon solution that leads to wastewater-free chemical sites. This is achieved by dewatering effluent to produce clean, reusable water and high caloric-value/low-volume liquid residue.

Water vapor is transported to a compartment containing hygroscopic salt solution, which is then dewatered using conventional methods. SAM consumes no external heat or power: evaporation is caused by the exothermic absorption of the effluent vapors into a flow of concentrated brine (such as LiBr). Heat and mass transfer is possible due to the device's heat pipes that keep the two components separate: the effluent's vapors only come into contact with the brine upon absorption.

Drystill's SAM enables toxic effluent to be treated at ambient temperatures (20-30 degrees Centigrade) and low water concentrations (20-30%) to significantly reduce thermally induced fouling and improve environmental viability.

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