Evaporation and Crystallization of Purge Water from Wet FGD Scrubbing

摘要

The US EPA has issued draft Effluent Limit Guidelines, which may have the practical effect of requiring zero liquid discharge (ZLD) wastewater treatment in some power plants. This means that the wastewater is reduced to a solid which is usually landfilled. Any recovered water from the ZLD treatment process is recycled and reused in the plant. In typical ZLD schemes, the wastewater is pre-concentrated in an evaporator; the concentrated wastewater is then reduced to a solid product using a crystallizer.