| Because of having such issues as ineffective recovery sulfur resources and the treatment secondary pollution in the process of biological purification for low concentration H2S from industrial production,waste water treatment and landfill, this paper researched padding and process optimization for hydrogen sulfide converting into s by biotrickling filter. Based on the dominant bacteria, we selected strong oxidizing iron oxide and silicon carbide with weak oxidizing as packing, explored the purification effect of H2S and the degradation products of different packing biological trickling filter ?Fe2O3 and SiC?,discussed the optimum parameters of biological trickling filter with SiC packing by the means of Response Surface Methodology.Using fast biofilm method in a week completed the biofilm, the results of biotrickling purification H2S running for a month showed that the purifying efficiency of Fe2O3 were higher than that of SiC as loading material of biotrickling filter. However, the products in SiC packing was elemental S, and in Fe2O3 packing was mainly calcium sulfate.Researched the effects of factors on hydrogen sulfide removal efficiency by biotrickling filters. The result shown that hydrogen sulfide removal efficiency was more than 95% at the inlet gas concentration under 700mg/m3, the retention time more than 30s, spray water pH of 6, the ratio of liquid/gas of 5-10 L/m3 and temperature of 27?33?.The sulfur recovery rate could reach 60.92% when fed with 500mg/m3 H2S with retention time of 30s.Using response surface methodology to study the purification of H2S by biological filter filled with SiC. The result shown that there were significant interact H2S removal efficiency between inlet loading and gas residence time. The applicability verification result ?P<0.05? of RSM model was shown that the model could reflect the true relationship between running parameters. The most optimal conditions of biological purification for low concentration of H2S was that the gas inlet loading of 68.84g/m3·h-1, retention time is 37s, the ratio of liquid and gas of 7.83L/m3, and hydrogen sulfide removal efficiency could reach 97.15% and the recovery rate could reach 65%. |
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