Biogas desulfurization process is usually used before direct combustion of biogas or biogas power generation. At present, biogas desulfurization technology includes dry desulfurization, wet desulfurization and biological desulfurization. What are their characteristics? Which desulfurization process has more development prospects?
1. Dry desulfurization features: simple structure, easy to use. In the process of work, there is no need for personnel to be on duty, periodically changing materials, one with equipment, alternating operation. The desulfurization rate of the new raw material is higher, but it decreases later. Regular replacement is required. The operation cost is on the high side.
2. The characteristics of wet desulfurization: the equipment can be operated continuously for a long time. The PH value is used to maintain the desulfurization efficiency and the operation cost is low. Complex technology requires special personnel on duty. Equipment needs to be maintained.
Biodesulfurization technology includes biofiltration, biosorption and trickling filtration. The three systems are open systems, and their microbial populations vary with the environment. In the process of biological desulfurization, oxidized sulfur-containing pollutants must be biodeoxidized to form sulfides or H2S and then bio-oxidized to form elemental sulfur in order to remove them. In most bioreactors, bacteria are the main microbial species, fungi are the second, and yeasts are rare. Biological desulfurization does not need catalysts and oxidants; it produces little biological pollution, low energy consumption, recovery of sulfur, high efficiency and odorless.
However, because the process is not easy to control and the conditions are extremely demanding, the domestic biological desulfurization technology has not yet formed a certain scale of industrial application.
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