Biogas biological desulfurization technology includes biofiltration, biosorption and trickle filtration. The three systems are open systems, and their microbial populations change with environmental changes. In the process of biogas biological desulfurization, the oxidized sulfur-containing pollutants can be removed only after they are biologically reduced to sulfide or H2S, and then biologically oxidized to elemental sulfur. In most bioreactors, microorganisms are mainly bacteria, followed by fungi, and there are few yeasts. The commonly used bacteria are Thiobacillus ferrooxidans, Thiobacillus denitrificans and Thiobacillus excretors of the genus Thiobacillus. The representative of success is Thiobacillus ferrooxidans, whose good pH value is 2.0 ~ 2.2.

沼气湿法脱硫可以归纳分为物理吸收法、化学吸收法和氧化法三种。物理和化学方法存在硫化氢再处理问题，氧化法是以碱性溶液为吸收剂，并加入载氧体为催化剂，吸收H2S，并将其氧化成单质硫，湿法氧化法是把脱硫剂溶解在水中，液体进入设备，与沼气混合，沼气中的硫化氢（H2S）与液体产生氧化反应，生成单质硫吸收硫化氢的液体有氢氧化钠、氢氧化钙、碳酸钠、硫酸亚铁等。成熟的氧化脱硫法，脱硫效率可达99.5%以上。

Wet desulfurization of biogas can be divided into physical absorption method, chemical absorption method and oxidation method. Physical and chemical methods have the problem of hydrogen sulfide reprocessing. The oxidation method uses alkaline solution as absorbent and oxygen carrier as catalyst to absorb H2S and oxidize it into elemental sulfur. The wet oxidation method dissolves the desulfurizer in water, and the liquid enters the equipment and mixes with biogas. Hydrogen sulfide (H2S) in biogas reacts with the liquid to produce elemental sulfur. The liquids that absorb hydrogen sulfide include sodium hydroxide, calcium hydroxide, sodium carbonate Ferrous sulfate, etc. With mature oxidation desulfurization method, the desulfurization efficiency can reach more than 99.5%.

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