What happens when there is an excess of TMT 15®?
The dosage rate of TMT 15® is calculated on the basis of the maximum quantity of Hg which is expected. Based on our experience, about 50 ml of TMT 15® per cubic meter of flue gas scrubbing water can be taken on an average, which means that this quantity can precipitate up to 6 g Hg/m³. Other heavy metals which are usually present in much higher concentrations (in municipal waste incinerators hundreds of grams per cubic meter) are already precipitated as hydroxides during the neutralisation step. Since the solubility of heavy metal-TMT compounds is much lower than the corresponding hydroxides, the excess of TMT 15® reacts with the hydroxides, (the solubility products for Cd(OH)2 and Cd3TMT2 are 3.1×10-14 and approx. 7×10-33 respectively) by forming hardly soluble heavy metal-TMT-compounds. The conversion of hydroxides to heavy metal-TMT precipitates proceeds until the excess of TMT 15® is used up. This phenomenon has been observed many times under practical applications. A TMT 15® exces
