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In the pursuit of green and low-carbon development today, efficient and environmentally friendly methods for removing hydrogen sulfide (H2S) from industrial gases are crucial for environmental protection, safe production, and resource utilization. Tangshan Lvyuan Environmental Protection employs chelated iron desulfurization technology; thanks to its unique advantages and advanced technical expertise, it offers environmentally friendly and efficient solutions for the effective treatment of biogas containing hydrogen sulfide. The LYSY complexed iron process is a green gas purification technique based on wet oxidation using Fe-based catalysts; it is a technology that combines desulfurization with sulfur recovery, directly converting H2S into elemental S in the liquid phase. The reaction process can be summarized as follows: in the absorption zone, dissolved H2S is ionized to HS-, which then reacts with Fe3+. HS- is oxidized to elemental S, while Fe3+ is reduced to Fe2+. Air is blown in to oxidize Fe2+ back to Fe3+, and the solution is recycled; the entire process is green and efficient. I. Principle of LYSY complexed iron for desulfurization 1. Overall reaction equation for absorption and oxidation: H2S(g) + 2Fe3+(L) → 2H+(L) + S↓ + 2Fe2+(L) 2. Regeneration principle: To restore the solution’s ability to absorb H2S, it is necessary to regenerate the solution; this regeneration process involves an oxidation reaction that results in sulfur precipitation: O2(g) + H2O(L) + 2Fe2+(L) → 2OH-(L) + 2Fe3+(L) II. Are you aware of the advantages of the complexed iron desulfurization technology? 1. Complexed iron catalyst, with a simple processing procedure. A one-step treatment process can rapidly oxidize hydrogen sulfide directly into elemental sulfur ； For various concentrations of H2S, the H2S content after desulfurization can be reduced to below 100 ppm, resulting in high efficiency in removing H2S. 2. The system has strong resistance to fluctuations. In conventional desulfurization units, when the hydrogen sulfide content in the feed gas fluctuates significantly, it causes large fluctuations in the hydrogen sulfide content of the purified gas at the outlet, and in some cases this level even exceeds the allowable limits. Thanks to the high sulfur capacity of complexed iron, the desulfurization system is fully capable of handling such fluctuations automatically; there is no need for manual adjustments to the operation, and this does not affect the desulfurization efficiency. 3. Low operating costs. Since the complexed iron catalyst used in the desulfurization process is renewable and can be reused without any side reactions, only a small amount of the complexed iron catalyst lost during the desulfurization process needs to be replenished. 4. The complexed iron catalyst has high selectivity, with no by-product salts discharged. In complexed iron desulfurization, complexed iron ions oxidize hydrogen sulfide to sulfur; the desulfurization process involves few side reactions, and the lifespan of the reagents is long. 5. The desulfurization working fluid has a high sulfur capacity. The use of complexed iron desulfurization agents can significantly reduce the amount of circulating fluid, minimize equipment size, and lower investment and operating costs. 6. It can remove organic sulfur compounds such as COS and thiols. 7. Delivered in skid-mounted format, environmentally friendly and convenient. Its skid-mounted design facilitates deployment; thanks to the advantage of smaller equipment resulting from a high sulfur capacity, the entire desulfurization system can be easily designed in a standardized, skid-mounted format. 8. High degree of automation and flexible operation. Fully automated program, easy to operate, flexible, and simple. 9. The catalyst has high safety; the catalyst used in the system is non-toxic and harmless to the environment and human health, offering excellent environmental benefits. 10. Waste emissions are essentially zero. The desulfurization system of this design does not generate any exhaust gases, solid waste, or wastewater. The air after regeneration can be discharged directly ； The separated sulfur paste can be sold directly ； The filtrate produced by the filtration of sulfur slurry is ultimately returned to the system for reuse, reducing chemical consumption. With the continuous increase in global demand for gaseous energy and increasingly stringent environmental regulations, the natural gas and biogas industries will have greater opportunities for development. The desulfurization industry, as a key factor in ensuring the cleanliness of gases, will also experience vigorous growth as a result. Lvyuan Environmental Protection employs a chelated iron desulfurization technology, along with a process flow designed taking into account the characteristics of biogas and natural gas treatment. This approach significantly reduces energy consumption, making the use of biogas as an energy source more economical. By recycling resources, every cubic meter of biogas is utilized to the fullest extent, thereby providing a \"green drive\" for sustainable development.