Study On Selection Of Fillers In Biotreatment To Remove H₂S In Biogas

Methane is a kind of biology energy. It contains firedamp 45%-80% (v), carbon dioxide 20%-45% (v), and little H2, H2S, NH3. H2S is a high irritative and nerve poisonous gas.H2S would pollute environment and erode equipments. For methane produced by different material, the quantity of H2S is always within 1-11g/m-3.However, when using methane as energy, the quantity of H2S in methane could not exceed 0.02 g/m-3by national environmental standard .So the desulfiriztion of biogas is necessary.Traditionally, the desulfiriztion of biogas is applied by physics method or chemical method. But these methods have disadvantages. Bioligical treament of H2S had many advantages, as high desulfurize efficiency, low expense. But there are few reports about biological treatment of H2S in methane. Bioligical treament of H2S has been used in this experiment, and researchs have been applied on it. The effect of desulfurization connected with characteristics of fillers. Different fillers had different characteristics, and have been used in different fields. If choosing wrong fillers, the goal could not be reached and maybe lead to the failure of the whole process. So it was important to choose appropriate fillers for fixing microbe.This research came from Hei Longjiang Province key scientific and technological project. The experiment device which is bio-tricking reactor was self-designed and installed.The study was carried on for the screenings of fillers. Six fillers were choosed for the experiment, which are ceramic ring, ceramic pellet, activated carbon, coke, zeolites, and plastic ring. To compared the performance of these fillers in bio-trickling filter. The conclusions of the research are as follows:(1)Physical properties such as surface area, porosity and fillers factors etc. The results revealed that six fillers had their own advantages.(2)Bio-film holding ability. The results indicated that all six fillers had short periods of domestication and bio-film holding. Because the material of plastic ring was plastics and had bad wettability, so it had longest bio-film holding time.The order of domestication and bio-film holding effect: activated carbon>zeolites>coke>ceramic pellet>ceramics ring>plastic ring.(3)Effect of H2S purification. The six analyzed bio-trickling filters were activated at the same time. Then the experiment compared the performance of these six fillers in bio-trickling filter about gas concentration, gas flows, load, liquid flows and pH value. The order of performance of used packing material was activated carbon>zeolites>coke>ceramic pellet>ceramics ring>plastic ring.(4)The experiment used six fillers on methane desulfurization. And a feasibility research was done about biological treatment on methane desulfurization. The experiment compared the desulfurization effect of six fillers. The results indicated that six fillers effct were good. And following the increase of the gas flows, the order of perification performance of used packing material was activated carbon>zeolites>coke>ceramic pellet>ceramics ring>plastic ring. Considering the effect of price and economy, the result is that zeolites and ceramic pellet have more desulfurization effect and economy.The paper provided a new way of research on the methane desulfurization. A fire-new methane desulfurization technology was designed. The study could provide important reference for the application of methane desulfurization of industrial producing methane technology.