The flow direction of biogas in the desulfurization tower can be divided into two types. One type is biogas that moves from bottom to bottom. In order to prevent condensation water from depositing at the top of the tower and wetting the desulfurizer, a certain thickness of crushed aluminum silicate fibers or other porous fillers can be laid on the top of the desulfurizer to block the condensation water. Another type is that the airflow flows from top to bottom, and the condensate generated inside the tower accumulates at the bottom of the tower, which can be regularly discharged through the drain valve. The bottom of the desulfurization tower should be equipped with sewage valves and biogas safety pressure relief devices.

氧化铁脱硫剂的更换时间应根据脱硫剂的活性和装填量、沼气中硫化氢含量和沼气处理量来确定。一旦脱硫剂失去活性，则需要将脱硫剂从塔内卸出，摊晒在空地上，用碱液或氨水将pH调整至8〜9,利用空气中的氧，进行自然再生。大型沼气干法脱硫装置，应设置机械设备装卸脱硫剂。

The replacement time of iron oxide desulfurizer should be determined based on the activity and loading amount of the desulfurizer, hydrogen sulfide content in biogas, and biogas treatment capacity. Once the desulfurizer loses its activity, it needs to be unloaded from the tower, spread on the open ground, adjusted to pH 8-9 with alkaline solution or ammonia, and naturally regenerated using oxygen in the air. Large biogas dry desulfurization devices should be equipped with mechanical equipment for loading and unloading desulfurization agents.

湿法脱硫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。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，并加人载氧体为催化剂，吸收硫化氢，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，沼气中的硫化氢与液体产生氧化反应，生成单质硫。

In large-scale desulfurization projects, wet desulfurization is generally used for coarse desulfurization first, followed by dry desulfurization for fine desulfurization. Wet desulfurization of biogas can be classified into three types: physical absorption method, chemical absorption method, and oxidation method. There is a problem of hydrogen sulfide reprocessing in physical and chemical methods. The oxidation method uses an alkaline solution as an absorbent and an oxygen carrier as a catalyst to absorb hydrogen sulfide and oxidize it into elemental sulfur. The wet oxidation method involves dissolving desulfurizers in water, and the liquid enters the equipment to mix with biogas. The hydrogen sulfide in biogas reacts with the liquid to form elemental sulfur.

物脱硫沼气生物脱硫工艺是一种的yl6809永利工艺，是在生物的作用下，将硫化氢氧化成单质硫的一种方法。生物脱硫方法主要是利用无色硫细菌，如氧化硫硫杆细菌、氧化亚铁硫杆细菌等，在微氧条件下将硫化氢氧化成单质硫，单质硫经过沉淀分离从而达到去除硫的目的。这种脱硫方法已经在德国yl6809永利中广泛使用，在国内某些工程中已有采用。其优点是：不需要催化剂、不需要处理化学污泥，产生很少的生物污泥、能耗低、可回收_质硫、去除。

The biological desulfurization process of biogas is a type of biogas desulfurization process that oxidizes hydrogen sulfide into elemental sulfur under the action of organisms. The biological desulfurization method mainly utilizes colorless sulfur bacteria, such as sulfur oxide sulfur rod bacteria and ferrous oxide sulfur rod bacteria, to oxidize hydrogen sulfide into elemental sulfur under micro oxygen conditions. The elemental sulfur is then precipitated and separated to achieve the purpose of sulfur removal. This desulfurization method has been widely used in biogas desulfurization in Germany and has been adopted in some domestic projects. Its advantages are: no catalyst required, no need to treat chemical sludge, minimal production of biological sludge, low energy consumption, and recyclability_ Quality sulfur, removal.

虽然生物脱硫具有能耗少、去除率高的特点，但给硫菌创造一个适宜的环境，才能其具有较高的生物活性，以达到到佳的脱硫效果，这种脱硫技术关键是如何根水箱据硫化氢的浓度来控制反应中供给的溶解氧浓度。

Although biological desulfurization has the characteristics of low energy consumption and high removal rate, creating a suitable environment for sulfur bacteria is essential for them to have high biological activity and achieve optimal desulfurization results. The key to this desulfurization technology is how to control the concentration of dissolved oxygen supplied in the reaction based on the concentration of hydrogen sulfide in the root tank.

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