Industrial Waste Water
Industrial Waste Waters containing inorganic (e.g. metal sulphates or chlorides) and/or organic contaminants (e.g. from the production of MDI, TDI or epoxy resins) are concentrated for minimum discharge or ZLD and recovery of valuable salts which can be marketed.
Related Technologies
Rising Film Evaporator
Falling Film Evaporator (FF)
Forced Circulation Evaporator / Crystalliser (FC)
Multiple Effect Evaporator (MEE)
Mechanical Vapour Recompression (MVR)
Value
- Multiple Effect Evaporation (MEE) or Mechanical Vapour Recompression (MVR) systems optimise energy costs
- Plant designed to minimise scaling
- High contaminant loadings can be handled
- Liquid purge can be eliminated (zero liquid discharge)
- Crystallisation of valuable salts
Process
- Chemical pre-treatment to remove scalents and heavy metals
- Filtration to remove precipitated heavy metals and other impurities
- Pre-treatment using stripping for CO₂ or NH₃ recovery, pH adjustment and/or filtration
- Rising or Falling Film as well as Forced Circulation Evaporators (to handle solids)
- Concentration and recovery of process condensate
- Crystallisation of target salts
- Centrifugation for salt separation and washing
- Recovered salt is further treated if necessary
Flow Diagram
Waste Water Pretreatment Tank
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