驯化城市污水处理厂氧化沟微生物降解SO2研究

利用SO2气体对从城市污水处理厂氧化沟采集的微生物进行诱导驯化,获得能将水中SO2转化为硫酸根,还能将其转化为有机硫固定到微生物中的脱硫菌。该脱硫菌在10 h内可以将水中97%以上SO2转化,具备了用于含SO2烟气脱硫的基本性能。在温度为10～30℃,该脱硫菌降解水中SO2的反应速率对水中溶解的SO2质量浓度可近似为一级反应,其速率常数k=6.522×108exp(-5 902/T),反应的活化能Ea=49.07 kJ/mol,其降解水中SO2最大速率可达1 152 mg/(L.h),但反应体系温度超过30℃,脱硫菌活性将明显降低。

Degradation SO2 in Aqueous Solution with Desulfuration Bacterium Domesticated from Oxidation Ditch of A City Sewage Treatment Plant

A dominant desulfuration bacterium,which were found from oxidation ditch of a city sewage treatment plant by inductive domestication with low concentration SO2 gas,can translate the SO2 in aque-ous solution into SO24-or（and） organic sulfur and fix them in the cell of desulfuration bacterium.The desulfuration bacterium can degrade about 97% SO2 within 10 h,and show possibility in desulfur action from flue gas.The kinetics of the desulfuration bacterium degradation SO2 in aqueous solution showed that the rate to conversion SO2（or SO32-） is first order reaction during 10 ～ 30 ℃,where the rate con-stant is 6.522 × 108 exp（-5 902 /T）,the activation energy is 49.07 kJ /mol,and the maximal rate for degradation SO2 is 1 152 mg /（L.h）.But the activity of the desulfuration bacterium will be deactivation evidently at above 30 ℃.