1-07　石炭火力発電所由来脱硫石膏に含まれる水銀の溶出挙動

抄録

Elution test was carried out in gypsum samples produced from a coal fired power plant, in order to understand the dissolution behavior of mercury when these materials are exposed to rain water. Experiments were carried out in 3 kinds of gypsums, two formed in liquid-column absorber desulfurization equipment and one from the jet bubbling type desulfurization equipment. For the elution test, the conventional batch method and the semi-batch method (improved method) were applied. The results revealed that the dissolution behavior of mercury varied significantly with the testing method. Furthermore, dissolution of mercury increased with decreasing pH. Quantification of mercury in eluate carried out by AAS show that in the conventional method, the dissolved mercury is then adsorbed, on the other hand, in the improved method, this behavior is negligible and only dissolution is observed.