完全混合生物工艺脱除二氧化硫气体

Desulfurization by completely mixed biological process

摘要:

运用完全混合生物处理工艺, 以预酸化的废糖蜜作为碳源进行了微生物法去除SO₂ 气体的研究, 在简单粗放的实验条件下, 研究了脱硫脱硫弧菌对预酸化的废糖蜜中有机酸的利用情况和对较高浓度SO₂ 气体的去除效果, 并对产物H2S 在第二级生物反应器中的去除率进行了测定。实验结果表明, 脱硫脱硫弧菌能利用预酸化的废糖蜜中的丙酮酸和乳酸作为碳源, 乙酸作为主要转化产物, 当二氧化硫进口浓度在1 865?4 637 mg/m³ 之间时, 在1#生物反应器中, SO₂ 去除率在91%以上, 最终出口SO₂ 去除率为95.5%, 产生的H₂S 在2#反应器中几乎被脱氮硫杆菌全部转化,平均去除率为98%, 菌体浓度均十分稳定, 系统运行状况良好。

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.