1.干法脱硫

1. dry desulphurization

干法脱除沼气气体中硫化氢（H2S）的设备基本原理是以O2使H2S 氧化成硫或硫氧化物的一种方法，也可称为干式氧化法。干法设备的构成是，在一个容器内放入填料，填料层有活性炭、氧化铁等。气体以低流速从一端经过容器内填料层，硫化氢（H2S）氧化成硫或硫氧化物后，余留在填料层中，净化后气体从容器另一端排出。

The basic principle of dry removal of hydrogen sulfide (H2S) from biogas gas is the way to oxidize H2S to sulfur or sulfur oxides by O2, or dry oxidation. The composition of the dry process equipment is to put the packing in a container and the activated carbon and iron oxide in the packing layer. The gas in low flow from one end of the container through the filler layer, hydrogen sulfide (H2S) oxidation of sulfur or sulfur oxides, remaining in the filler layer, the purified gas is discharged from the other end of the container.

2.湿法脱硫

2. wet desulphurization

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 desulphurization can be divided into three kinds: physical absorption method, chemical absorption method and oxidation method. The physical and chemical methods of hydrogen sulfide and then deal with the problem, oxidation is alkaline solution as the absorbent, and adding oxygen carrier as catalyst, H2S absorption, and the oxidation of elemental sulfur, wet oxidation desulfurization agent is dissolved in water, liquid into the equipment, and the methane in biogas mixture, hydrogen sulfide (H2S) by the oxidation reaction with the liquid sulfur forming H2S absorption liquid has sodium hydroxide, calcium hydroxide, sodium carbonate, ferrous sulfate, etc.. The oxidation desulfurization process is mature, and the desulfurization efficiency can reach more than 99.5%.

在大型的脱硫工程中，一般采用先用湿法进行粗脱硫，之后再通过干法进行精脱硫。

In the large-scale desulphurization project, the crude desulfurization is usually used first, and then the dry desulfurization is carried out by dry method.

3.生物脱硫

3. biological desulphurization

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。在大多数生物反应器中，微生物种类以细菌为主，真菌为次，极少有酵母菌。常用的细菌是硫杆菌属的氧化亚铁硫杆菌，脱氮硫杆菌及排硫杆菌。最成功的代表是氧化亚铁硫杆菌，其生长的最佳pH值为2.0～2.2。

Biological desulfurization technology includes biological filtration, biological adsorption and biotrickling filtration. The three systems are open systems, and their microbial populations vary with environment. In the process of biological desulfurization, oxidizing sulfur pollutants must first undergo biological reduction to produce sulfide or H2S, and then produce elemental sulfur by biological oxidation process, so that they can be removed. In most bioreactors, microbial species are mainly bacteria, fungi are the second, and rarely have yeast. The commonly used bacteria are Thiobacillus ferrooxidans, Thiobacillus and sulphur bacillus in the genus Thiobacillus. The most successful representative is Thiobacillus ferrooxidans, whose optimum pH value is 2 to 2.2.