Study On Flue Gas Desulfurization With Thiobacillus Ferrooxidans

Flue gas desulfurization (FGD) is the most important technical means of SO2 pollution control. And that bio-flue gas desulphurization became a new technical developing area superior to traditional FGD because of its simple operating art, low cost of running fees and zero secondary pollution.Thiobacillus ferrooxidans (T.f) became one of the most important desulphurization bacterium because of its particular double oxidation systems. Now the research for bio-desulphurization still rests on mechanism discussing phase. This paper mainly discusses following items: the selection of optimum culturing condition of T.f.; the key of solving desulfurizaion efficiency-immobilizing bactirum on carrier to improve density of T.f; To adopt bio-filter as simulation tester of FGD; To study the reaction characteristics and efficiency of immobilized T.f filled in bio-reacter.The research indicate: active carbon and pottery grains have no negative influence on T.f growth. They are good carriers and bio-reacter fillings. When carriers exist in the system, the ratio-growth velocity can reach 0.06h'1, there is no abvious difference compare to favourably with pure T.f system; shaking beds and Airlift Tower Loop Reactor(ALR) can be used in T.f enrichment and carrier immobilization. Under these two circumstances, the growth cycle of T.f are between 40 and 50 hours. ALR can keep equivalent reaction activeness. The reaction condition of shaking bed can be easily controlled, which is propitious to T.f purification and enrichment. The ALR can culture a large quantities of T.f and also a effective way of T.f immobilization; the optimum culture condition of T.f carrier immobization can be achieved by experiments and growth response model of T.f; keeping the optimum temperature and shaking velocity(inoculation proportion v/v is 10%, quantity of carrier is 20g), system can reach maximal T.f growth velocity. Mature T.f film bears good and steady desulfurization efficiency, the flue gas purifying rate can reach 60%. After a long time domestication bio-film has a little SO2 oxidation capacity; bio-FGD dynamics model can approximately estimate desulfurization efficiency of bio-filter. In one of experiments the value is212.4g/m3bio-film h; It can be include: ferrite oxidation capacity of T.f act an important role in the process of bio-deslufurization, which is the true mechanism of practical application and industrial operation. The study results will build foundation of extensive experiments research and industrial implication.