The waste waters produced during the flue-gas desulfurisation process have to be treated before being discharged. The main requirements are: Gypsum desaturation, Reduction of solids, Removal of heavy metals.
The treatment procedures for flocculation, precipitation and sedimentation will be designed as two-staged processes. If requested by our clients a continuous sand filtration will be added.
Depending on the location of the water treatment plant and the discharge requirements to be fulfilled there further treatment steps can be necessary:
- Further reduction of solids (filtration)
- Further reduction of specific substances (nitrate)
- Evaporation (ZLD = Zero Liquid Discharge processes) for reliable compliance with water drain regulations