The coal used and the operation mode of the flue gas washing process are decisive for the quality of the waste water from the flue gas desulphurisation of coal-fired power plants. The requirements for waste water treatment therefore depend on the location of the plant. The treatment focuses on the removal of sulphates and heavy metals. To this end, H+E employs multi-stage precipitation processes, sedimentation stages and selective ion exchangers. Further treatment steps may be necessary depending on the quality criteria that the discharged waste water must meet. Evaporation systems and drying systems are examples of these steps.
Under certain conditions, only waste-water-free treatment concepts can be used, so-called ZLD concepts. All H+E plants have one characteristic in common: they are individually tailored to the requirements of the respective power plant location.