生物脱硫是一种利用微生物的代谢作用，将含硫化合物转化为无害或易处理物质的环保技术。与传统的化学脱硫相比，它凭借低能耗、低运行成本及无二次污染等优势，成为实现硫化物资源化与无害化的重要绿色技术路径。

Biological desulfurization is an environmentally friendly technology that utilizes the metabolic processes of microorganisms to convert sulfur-containing compounds into harmless or easily treatable substances. Compared with traditional chemical desulfurization, it has become an important green technology path for realizing sulfide resource utilization and harmless treatment due to its advantages of low energy consumption, low operating costs, and no secondary pollution.

其核心在于微生物的氧化还原反应。在生物脱硫系统中，硫氧化细菌等特种微生物将硫化氢等含硫污染物作为能量来源。在好氧或微氧条件下，微生物通过呼吸作用将硫化氢氧化为单质硫或硫酸根。例如，在生物滴滤塔中，含硫气体首先被碱液吸收转化为硫酸根或亚硫酸根，随后在厌氧反应器中由硫酸盐还原菌将其还原为硫离子，最后在好氧反应器中由硫氧化菌将其转化为高纯度的生物硫磺。这一过程不仅实现了气体的净化，还能回收单质硫作为化工原料。

The core principle lies in the oxidation-reduction reaction of microorganisms. In biological desulfurization systems, special microorganisms such as sulfur oxidizing bacteria use sulfur-containing pollutants such as hydrogen sulfide as an energy source. Under aerobic or microaerophilic conditions, microorganisms oxidize hydrogen sulfide to elemental sulfur or sulfate ions through respiration. For example, in a biological drip filtration tower, sulfur-containing gas is first absorbed and converted into sulfate or sulfite by alkaline solution, then reduced to sulfur ions by sulfate reducing bacteria in an anaerobic reactor, and finally converted to high-purity biological sulfur by sulfur oxidizing bacteria in an aerobic reactor. This process not only achieves gas purification, but also recovers elemental sulfur as a chemical raw material.

生物脱硫工艺的控制高度依赖环境参数。微生物的代谢活性受温度、pH值和溶解氧浓度的显著影响，最适宜的反应温度通常在25-35℃之间，pH值需维持在6.5-8.0。为确保微生物工作，系统需配备预过滤装置以去除粉尘和杂质，防止生物膜载体堵塞。同时，通过在线监测系统实时采集反应参数，当pH值偏低时自动添加营养液，从而维持微生物的活性与脱硫效率。凭借高达95%以上的去除率，生物脱硫技术正广泛应用于沼气净化和工业尾气处理领域。

The control of biological desulfurization process is highly dependent on environmental parameters. The metabolic activity of microorganisms is significantly affected by temperature, pH value, and dissolved oxygen concentration. The most suitable reaction temperature is usually between 25-35 ℃, and the pH value needs to be maintained between 6.5-8.0. To ensure efficient operation of microorganisms, the system needs to be equipped with a pre filtration device to remove dust and impurities, and prevent clogging of biofilm carriers. At the same time, real-time reaction parameters are collected through an online monitoring system, and nutrient solution is automatically added when the pH value is low, thereby maintaining microbial activity and desulfurization efficiency. With a removal rate of over 95%, biological desulfurization technology is widely used in the fields of biogas purification and industrial exhaust gas treatment.