Removal of sulphur-nitrogen compounds from FGD wastewater by ozone treatment

摘要

For five years the Elsam power station situated in Esbjerg has used spray dry absorption product(SDAP)from the semi-dry flue gas desulphurisation(FGD)units as an absorbent in the wet FGD unit.This has given considerable improvements:The dry FGD can increase the SO_2 retention because a high excess of absorbent can be justified.The wet FGD increases the SO_2 retention slightly because of the higher reactivity of SDAP compared with limestone.The increased reactivity also gives a smoother/ faster regulation of the wet FGD system.