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.