Location wastewater facility in a molybdenium factory

GEA Messo PT combines innovative solutions of broad interdisciplinary range (chemical treatment, membrane processes, evaporation and crystallization) to achieve recovery of processing water from aqueous waste solutions at low energy consumption and capital investment. Download our brochure
In a typical system, brine treatment removes fouling and scaling compounds from the solution. Then, the solution is filtered and acidified. Reverse Osmosis separates most of the water at industrial-quality purity levels from the dissolved solids with low energy consumption. The effluent, free of fouling/scaling components, is easily concentrated in a Mechanical Vapor-Recompression (MVR) Falling Film Evaporation system. The solids in the evaporator discharge are further concentrated in a final evaporative crystallizer driven by thermal vapour recompression (TVR) under controlled crystallization conditions. The solids are then separated with a filter and disposed, while the filtrate is returned to the crystallizer. All process condensate is returned to the waste generator for industrial use. 
 

Zinc oxide wastewater treatment plants

The leachate waste water contains Sodium Chloride and Potassium Chloride and Sulphate compounds. Heavy metals like Zn are precipitated with Na₂CO₃ (BEFESA patent) and separated by filtration.

The filtrate is fed to crystallization units (utilizing Mechanical or Thermal Vapor Recompression) operated as Zero Liquid Discharge units. This type of operation is prone to the precipitation of Glaserite on the equipment internal surfaces, which however can be avoided with proper design features. A mixed salt is precipitated and disposed as solid waste. The process condensate is reused within the parent plant.