Research On Sulfides Removal Of Coke Oven Gas By Bio-Trickling Filter

With the increasing atmospheric environmental pollution in our country recently, it is much more important to reduce the emissions of air pollutants and promote clean utilization technology of fossil energies. Coal is the major energy resource in our country, but it can cause acid rain, haze and other environmental problems due to the generation of sulfate when it burn. The coke oven gas we researched here is a by-product of coking industry. It is difficult to use as a kind of energy gas because it contains sulfides. A vast of coke oven gas is wasted every year and it can cause air pollution. The sulfides in the gas are various and hard to remove. There are H2S and many other organic sulfides like thioether, thiophene and carbonyl sulfide and so on. Biological desulfurization is a technology of less energy consumption, environmentally friendly and not complicated. What’s more, it can remove different kinds of sulfides simultaneously with appropriate microorganisms. It is identified as one of the best desulphurization technologies of great potential in the future. In this work, we use a new strain named Sphingomonas sp. PL1 and aim to find out the feasibility and development prospect in desulfurization of coke oven gas.Firstly, we tested its metabolic capability of inorganic sulfur by adding Na2S in the liquid medium. And we detected the metabolite under different initial concentration and pH to deduce its metabolic pathways and the main products.And then we tested its metabolic capability of DBT (the classical model compound of organic sulfur) and enhance its removal efficiency by domesticating the microorganism. Finally, we find out the influence of initial concentration, pH and the existence of organic carbon or inorganic sulfur during the experiments.At last, we designed a small model of bio-tricking filter which was made with Plexiglas. Sphingomonas sp. PL1 was inoculated to remove sulfide in gas. We obtained the removal efficiency and max eliminate capacity of single and mixed H2S, COS and dimethyl thioether, and the influence of inlet concentration, EBRT. Then we tested the stability of the system when changed the inlet concentration and nutrient solution’s pH.