During evaporation, a solution gets concentrated when a portion of the solvent, usually water, is vaporized, leaving behind a saline liquor that contains virtually all of the dissolved solids, or solute, from the original feed. The recovery of valuable materials or separation of hazardous materials from wastewater flows can be accomplished with evaporation technology. It can be effective for concentrating or removing salts, heavy metals and a variety of hazardous materials from solution. Also, it may be used to recover useful by-products from a solution, or to concentrate liquid wastes prior to additional treatment and final disposal.

Many industries face the problem of waste-water evaporation. Aashman Solar has designed and delivered solar evaporators for waste-water evaporation systems to help compliance with Pollution Control Norms.