空气注入原位去除鸡粪发酵沼气中H2S

鸡粪厌氧发酵产沼气中H₂S含量高，在发电或提纯制备生物燃气前需要对其进行去除.开展批次鸡粪发酵试验，向发酵瓶中通入微量空气，通过生物氧化作用去除H₂S.试验以连续稳定运行90d的中温厌氧罐出料为接种污泥，通入7~50mL/gVS的空气.结果表明，空气通入显著地降低了沼气中的H₂S浓度，空气通入量为30mL/gVS的实验组平均脱硫效率最高，达到62%.同时，该空气通入条件下累积甲烷产量达到335mL/gVS，相较于空白累积甲烷产量提升了78.6%.通入微量空气的生物脱硫方法具有工艺简单和高效脱除H₂S的应用前景.

In-situ removal of H2S from chicken manure biogas by injecting air

Biogas from chicken manure with anaerobic digestion has a high concentration of H₂S, which needs to be removed before further utilization such as power generation or purification to produce bio-natural gas. A batch experiment of chicken manure digestion was carried out in this study, and trace amount of air was introduced into the reactors to remove hydrogen sulfide by biological oxidation. The test was carried out by feeding the inoculum obtained from the effluent of chicken manure methane digestion reactor under mesophilic conditions, and introducing air at level of 7~50mL/g VS. Air introduction significantly reduces the H₂S concentration in the biogas. The experimental group with an air dosage of 30mL/g VS had the highest average desulfurization efficiency of 62%. At the same time, the cumulative methane production of the experimental group with an air dosage of 30mL/gVS reached 335mL/gVS, which was 78.6% higher than the control group. The biological desulfurization method with trace amount of oxygen has the application prospect of simple procedure and efficient removal of H₂S.