Desulfurization by completely mixed biological process

Abstract:

With the applying of completely mixed biological process, microbiological method of removing SO₂ was studied as pre-acidified waste molasses was used as carbon source. Under extensive experimental condition, Desulfovibrio desulfuricans’ utilization situation of organic acids in pre-acidified waste molasses as well as its desulfurization effect of sulfur dioxide in high concentration were researched, at the same time, the removal rate of the product H₂S in the second biological reactor was also determined. The results suggested that Desulfovibrio desulfuricans could exploit pyruvic acid and the lactic acid in pre-acidified waste molasses as its carbon source, with acetic acid as main product. When the inlet concentration of SO₂ ranged from 1 865 mg/m³ to 4 637 mg/m³, the removal rate of SO₂ was more than 91% in 1# biological reactor and the final removal rate of SO₂ was 95.5%, the produced H2S was nearly all transformed with the mean removal rate of 98%. pH and the concentration of the bacteria were quite stable and the system operated well.