ZLD is broadly defined as the separation of an aqueous waste to its water and solids components. The water is reused, and the solids (usually with some residual moisture) are disposed as a waste.
GEA Messo PT offers evaporation and crystallization systems for industrial wastewater treatment applications. Each installation is custom-designed to fit client-specific requirements, and can combine additional unit operations as necessary, to deliver an energy-efficient, low-investment package.
Brine purification, filtration, reverse osmosis are employed to reduce the overall energy requirements of the facility, and to allow the use of less expensive materials of construction; the removal of scaling components allows the use of simple (unseeded) Falling Film evaporators, and finishing Forced-Circulation evaporative crystallizers are used to reduce the waste water to wet solids and industrial-quality condensate. The evaporator and crystallizer can be operated with live steam, Thermal Vapor Recompression or Mechanical Vapor Recompression.
On occasion, if economically attractive, by-products of value can be recovered from the feedstock.