In the majority of the developed world, legislation has been Introduced to reduce sulphur emissions from coal combustion processes through flue gas desulphurization systems. On the downside, the Installation of such technology is a costly business, even with governmental financial support. However, by combining the limestone gypsum FDG system with batch basket filtration centrifuges, a saleable product, i.e. high quality gypsum, can be produced, which makes the Incorporation of FGD technology a much more economically Viable option. Nigel Day explains.