The sulfur in biogas mainly exists in the form of H2S and contains less organic sulfur. There are many ways to remove hydrogen sulfide, generally including dry desulfurization, wet desulfurization and biological desulfurization.

（1）湿法脱硫

(1) Wet desulfurization

湿法脱硫是利用特定的溶剂与气体逆流接触而脱除其中的H2S，溶剂通过再生后重新进行吸收，根据吸收机理的不同，又分为化学吸收法、物理吸收法、物理化学吸收法以及湿式氧化法。湿式氧化法脱硫效率高，单质硫可回收，流程较简单，大多数脱硫剂可以再生，运行成本低等；同时该法流程复杂、投资大、适用于气体处理量大，H2S含量高的场合。

Wet desulfurization is to remove H2S by countercurrent contact between specific solvent and gas. The solvent is re absorbed after regeneration. According to different absorption mechanisms, it is divided into chemical absorption method, physical absorption method, physical-chemical absorption method and wet oxidation method. Wet oxidation method has high desulfurization efficiency, recyclable elemental sulfur, simple process, regeneration of most desulfurizers and low operation cost; At the same time, the method has complex process, large investment and is suitable for occasions with large gas treatment capacity and high H2S content.、

（2）干法脱硫

(2) Dry desulfurization

干法脱硫通常用于低含硫气体处理，特别是用于气体精细脱硫。大部分干法脱硫工艺由于需要更换脱硫剂而不能继续操作，还有一些干法如锰矿法、氧化锌法、氧化铁、活性炭等，脱硫剂不能再生或再生次数很少，脱硫饱和后要废弃，这样一方面会造成环境问题，另一方面会增加脱硫成本。

Dry desulfurization is usually used for low sulfur gas treatment, especially for fine gas desulfurization. Most dry desulfurization processes cannot continue to operate because the desulfurizer needs to be replaced. For some dry processes, such as manganese ore process, zinc oxide process, iron oxide, activated carbon, etc., the desulfurizer cannot be regenerated or the regeneration times are few. After desulfurization is saturated, it will be abandoned, which will cause environmental problems on the one hand and increase the desulfurization cost on the other hand.

（3）生物脱硫

(3) Biological desulfurization

生物脱硫系统以各种微生物的容纳力为基础，利用微生物的生命活动将有机污染转化为对人体健康和生态环境无害的化合物、生物法常用于污水处理工程中产生的硫化物。生物脱硫技术包括生物过滤法、生物吸附法和生物滴滤法，三种系统均属开放系统，其微生物种群随环境改变而变化。在生物脱硫过程中，氧化态的含硫污染物必须先经生物还原作用生成硫化物或H2S，然后再经生物氧化过程生成单质硫，才能去除。

Based on the capacity of various microorganisms, biological desulfurization system uses the life activities of microorganisms to convert organic pollution into compounds harmless to human health and ecological environment. Biological method is often used to produce sulfide in sewage treatment projects. Biological desulfurization technology includes biological filtration, biological adsorption and biological trickle filtration. The three systems are open systems, and their microbial populations change with the change of environment. In the biological desulfurization process, the oxidized sulfur-containing pollutants must be first reduced to sulfide or H2S, and then oxidized to elemental sulfur.

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