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Driven by the dual demands for environmental protection and energy utilization, the treatment of biogas containing hydrogen sulfide has become an important issue in the agricultural and environmental sectors. The high concentration of hydrogen sulfide (H2S) in biogas not only corrodes equipment and increases maintenance costs, but it also poses a threat to human health; 0.1% hydrogen sulfide in the air can be fatal. Under the high-temperature conditions of anaerobic fermentation, the concentration of biogas can reach several thousand ppm; therefore, desulfurization is an essential step in biogas production, in order to protect the environment and human health. In biogas desulfurization projects, the dry desulfurization method is simple to operate, low in cost, and provides stable results; it is highly favored by small and medium-sized enterprises. It relies on iron oxide as a desulfurizing agent, which adsorbs and converts H2S through chemical reactions, ultimately producing elemental sulfur or stable sulfides. Advantages of dry desulfurization: (1) Low investment and operating costs; the dry desulfurization system is relatively simple with fewer devices, resulting in lower construction costs and operational expenses ； (2) It occupies less space, as the equipment is simple and no complex water treatment facilities are required, thus saving space ； (3) It is easy to operate; the dry desulfurization process is simple, requires straightforward operation, and has low maintenance costs ； (4) No wastewater is discharged; dry desulfurization produces no exhaust gases or wastewater, is environmentally friendly and non-toxic, with no secondary pollution ； (5) High desulfurization precision, with a desulfurization rate of up to 95% ； (6) High safety performance: system equipment will not stick together, get clogged, or corrode ； (7) It has low energy consumption; the temperature of the purified flue gas is high, which facilitates the dispersion of exhaust gases through the chimney, eliminating the need for secondary heating.