在工艺流程上，首先，硫化氢的沼气气体进入洗涤塔，在塔内与混合中碱产生反应并从沼气中初步脱除硫化氢。接下来，洗涤塔吸收液流至塔底，进入生物反应器。在反应器底部有空气分布系统，给微生物提供氧气，通过微生物细胞壁上的酶将反应器中的硫化物转化为单质硫，单质硫在分离器中分离，完成再次脱硫，同时碱液得到再生。然后利用微生物在新陈代谢的过程中吸收硫元素，从而达到深度脱硫的目的，脱硫效率高达99%以上。

上海电气旗下上海环保工程成套有限公司将沼气生物湿法脱硫技术用于山鹰纸业（广东）有限公司造纸污水处理项目，对其造纸废水厌氧处理过程中产生的沼气进行脱硫处理，以降低沼气中的硫化氢浓度，从而减少送入发电机里的沼气中硫化氢浓度。在延长发电机火花塞等部件的使用寿命的同时，确保发电排放烟气中的二氧化硫完全满足排放要求。通过脱硫处理后的沼气可用于发电，降低生产过程中的用电成本，同时，减少对化石燃料的依赖，减少二氧化碳的排放，为实现“双碳”目标贡献力量。

In the process, first of all, the methane gas of hydrogen sulfide enters the scrubber, reacts with the mixed alkali in the tower and initially removes hydrogen sulfide from the methane. Next, the scrubber absorption liquid flows to the bottom of the tower and into the bioreactor. There is an air distribution system at the bottom of the reactor to provide oxygen to the microorganisms, and the sulfur in the reactor is converted into elemental sulfur by enzymes on the microbial cell wall. The elemental sulfur is separated in the separator to complete the re-desulfurization, and the lye is regenerated. Then the use of microorganisms in the process of metabolism to absorb sulfur elements, so as to achieve the purpose of deep desulfurization, desulfurization efficiency of more than 99%.

Shanghai Environmental Protection Engineering Co., LTD., a subsidiary of Shanghai Electric, applied biogas biological wet desulfurization technology to the papermaking wastewater treatment project of Shanying Paper (Guangdong) Co., LTD., to desulfurize the biogas generated during the anaerobic treatment of its papermaking wastewater, so as to reduce the concentration of hydrogen sulfide in the biogas and thus reduce the concentration of hydrogen sulfide in the biogas fed into the generator. While extending the service life of the generator spark plug and other components, it ensures that the sulfur dioxide in the flue gas emitted from the power generation fully meets the emission requirements. Biogas after desulfurization can be used to generate electricity, reduce the cost of electricity in the production process, and at the same time, reduce the dependence on fossil fuels, reduce carbon dioxide emissions, and contribute to the realization of the "dual carbon" goal.