沼气生物脱硫是20世纪90年代发展起来的新技术，利用脱硫微生物催化沼气中的硫化氢，在控制氧气浓度的条件下将其转化为硫酸或单质硫。该技术通过氧化还原电位调控实现选择性转化，具有低运行成本、环境友好等特点。与化学脱硫法相比，生物法脱硫由于条件温和、硫化氢去除比例高、无需催化剂、消耗能量少，并且很少产生废液等优点，得到了广泛应用。其工艺通常包含洗涤塔吸收、生物反应器转化和硫沉淀分离三个核心步骤。生物脱硫是利用微生物的代谢作用将沼气中的硫化氢转化为单质硫或硫酸盐，可实现环保和低成本脱硫。

Biogas desulfurization is a new technology developed in the 1990s, which utilizes desulfurization microorganisms to catalyze hydrogen sulfide in biogas and convert it into sulfuric acid or elemental sulfur under controlled oxygen concentration conditions. This technology achieves selective conversion through redox potential regulation, and has the characteristics of low operating cost and environmental friendliness. Compared with chemical desulfurization methods, biological desulfurization has been widely used due to its mild conditions, high hydrogen sulfide removal ratio, no need for catalysts, low energy consumption, and minimal waste liquid generation. The process usually includes three core steps: washing tower absorption, bioreactor conversion, and sulfur precipitation separation. Biological desulfurization is the use of microbial metabolism to convert hydrogen sulfide in biogas into elemental sulfur or sulfate, which can achieve environmental protection and low-cost desulfurization.

沼气生物脱硫技术经历了三代发展。第一代干法脱硫采用硫酸铁脱硫剂，需频繁更换导致成本高；第二代湿法脱硫通过碱液吸附结合催化剂再生，降低劳动强度；第三代生物脱硫则利用微生物的代谢作用实现脱硫。生物脱硫工艺主要分为一体式和分离式两大类。一体式工艺通过将空气混合沼气在生物滤池中脱硫，适用于低浓度硫化氢的处理；分离式工艺则采用洗涤塔与生物反应器分步处理，解决了填料堵塞问题，适用于高浓度硫化氢及沼气提纯等场景。

Biogas desulfurization technology has undergone three generations of development. The first generation of dry desulfurization uses iron sulfate desulfurizer, which requires frequent replacement, resulting in high costs; The second generation wet desulfurization reduces labor intensity by adsorbing alkaline solution and regenerating catalyst; The third generation of biological desulfurization utilizes the metabolic activity of microorganisms to achieve efficient desulfurization. The biological desulfurization process is mainly divided into two categories: integrated and separated. The integrated process is suitable for the treatment of low concentration hydrogen sulfide by mixing air with biogas for desulfurization in a biological filter; The separation process adopts a washing tower and a bioreactor for step-by-step treatment, which solves the problem of packing blockage and is suitable for high concentration hydrogen sulfide and biogas purification scenarios.

沼气生物脱硫的核心设备是生物脱硫塔。含硫化氢的气体进入脱硫塔后，在塔内与喷淋液反应而脱除其中的硫化氢。设备通常包括塔体（顶部设有循环喷淋系统、中段设有填料层）、底部的除硫系统等部分。生物脱硫是在生物滴滤塔、生物洗涤器或生物滤池中进行的。以生物滴滤塔为例，其通过优化内部填料设计与气液流动路径，大幅提升了反应效率。运行过程中需要准确控制pH值、温度、氧气供给等参数以优化微生物活性。将少量空气（约2-6%）注入沼气管道或生物脱硫塔中，利用好氧微生物将硫化氢氧化成单质硫或硫酸盐。

The core equipment for biogas biological desulfurization is the biological desulfurization tower. After entering the desulfurization tower, the gas containing hydrogen sulfide reacts with the spray liquid inside the tower to remove the hydrogen sulfide. The equipment usually includes a tower body (with a circulating spray system at the top and a packing layer in the middle), a sulfur removal system at the bottom, and other parts. Biological desulfurization is carried out in biological drip towers, biological scrubbers, or biological filters. Taking the biological drip filtration tower as an example, it greatly improves the reaction efficiency by optimizing the internal packing design and gas-liquid flow path. During operation, precise control of parameters such as pH value, temperature, and oxygen supply is required to optimize microbial activity. Inject a small amount of air (about 2-6%) into the biogas pipeline or biological desulfurization tower, and use aerobic microorganisms to convert sulfide into elemental sulfur or sulfate.

在应用方面，沼气生物脱硫技术已实现产业化应用。以某厨余垃圾资源化利用项目为例，从沼气组分、工艺流程、调试流程、控制指标等方面进行了系统分析。生物滴滤脱硫作为一种新型脱硫处理工艺，具有生长条件易调节、设备结构简单、过程操作简便、运行成本低、污染物去除效率高等特点。碱法生物脱硫技术能够达到后续设备对硫化氢净化的要求，副产物处置难度相对较低，前期建设和运行维护费用也相对较低。生物脱硫技术现已广泛应用于污水处理、农业发酵及天然气净化等领域，硫化氢去除率高达99.5%，产物硫磺可作化肥原料。随着技术的不断成熟和环保要求的日益严格，沼气生物脱硫正朝着更、更稳定的方向发展。

In terms of application, biogas biological desulfurization technology has achieved industrial application. Taking a kitchen waste resource utilization project as an example, a systematic analysis was conducted from the aspects of biogas components, process flow, commissioning process, and control indicators. Biological drip filtration desulfurization, as a new type of desulfurization treatment process, has the characteristics of easy adjustment of growth conditions, simple equipment structure, easy process operation, low operating costs, and high pollutant removal efficiency. The alkaline biological desulfurization technology can meet the requirements of subsequent equipment for hydrogen sulfide purification, with relatively low difficulty in by-product disposal and relatively low initial construction and operation maintenance costs. Biological desulfurization technology has been widely used in fields such as sewage treatment, agricultural fermentation, and natural gas purification. The removal rate of hydrogen sulfide is as high as 99.5%, and the product sulfur can be used as a fertilizer raw material. With the continuous maturity of technology and increasingly strict environmental requirements, biogas biological desulfurization is developing towards a more efficient and stable direction.

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