Abstract
A new method for producing fine particles of cadmium sulfide using a bioreactor with sulfate-reducing bacteria was proposed. The reactor composed of three layers, i.e. sulfate-reducing bacteria layer to produce hydrogen sulfide, cadmium solution layer, and membrane filter layer on which cadmium sulfide was produced as the result of reaction between hydrogen sulfide and cadmium ion. Hydrogen sulfide gas began to produce at the first day of experiment and 6, 000-10, 000μl/l in average was produced. The characteristics of particle generated was depended on property and pore size of membrane filter used. Among filters, 0.2μm pore size of polycarbonate was best choise, resulting 0.5μm of fine particle of cadmium sulfide in uniform quality. In case of using pure hydrogen sulfide (5, 000μl/l and 10, 000, μl/l), not from sulfate-reducing bacteria, 0.2μm of fine particle of cadmium sulfide in uniform quality was accumulated.
