College of Engineering, China Agricultural University (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), Beijing, 100083, China.
College of Engineering, China Agricultural University (Key Laboratory for Clean Renewable Energy Utilization Technology, Ministry of Agriculture), Beijing, 100083, China.
Chemosphere. 2023 Dec;344:140370. doi: 10.1016/j.chemosphere.2023.140370. Epub 2023 Oct 4.
A novel system integrating an in-situ and ex-situ power-to-gas (PtG) system was developed in the current study. A continuous stirred-tank reactor (CSTR) was operated using cattle manure as substrate at mesophilic temperature (37 °C ± 2 °C). The CH content in the biogas was upgraded to above 95% by H injection, which meets the highest criteria for grid injection without requiring CO removal. Furthermore, the bio-nature gas production was promoted by external CO and H injection. The volumetric methane production rate (VMPR) was significantly increased by 739% from 117.4 mL L·d to 985 mL⋅L⋅d, which is higher than in other studies. Meanwhile, the volumetric biogas production rate (VBPR) was increased by 36.9% by H injection, increasing the conversion efficiency (82.56%) of the chemical oxygen demand (COD) to CH. A significant increase in the specific methanogenic activity of dissolved hydrogen (SMA(H)) and the enrichment in hydrogenotrophic methanogens (Methanobacterium) demonstrate that the CH production pathway was converted from acetoclastic methanogenesis (AM) pathway to hydrogenotrophic methanogenesis (HM) pathway. It is postulated that the change in proportion of different pathways of the CH production was caused by the strengthening of key enzymes (coenzyme F hydrogenase and coenzyme-B sulfoethylthiotransferase) by H injection. The integrated system represents a promising approach to achieve simultaneous CO emission reduction and bio-natural gas production.
本研究开发了一种新型的原位和异位电力到天然气（PtG）系统集成系统。采用中温（37°C±2°C）条件下的连续搅拌釜式反应器（CSTR）以牛粪为基质进行运行。通过注入氢气将沼气中的 CH 含量提高到 95%以上，无需去除 CO 即可达到电网注入的最高标准。此外，通过外部 CO 和 H 注入促进生物天然气的生产。体积甲烷生成速率（VMPR）显著增加了 739%，从 117.4 毫升·升·天增加到 985 毫升·升·天，高于其他研究。同时，通过注入 H，体积沼气生成速率（VBPR）增加了 36.9%，使化学需氧量（COD）到 CH 的转化率提高到 82.56%。溶解氢的特定产甲烷活性（SMA（H））的显著增加和氢营养型产甲烷菌（甲烷杆菌）的富集表明，CH 生成途径从乙酸营养型产甲烷途径（AM）途径转变为氢营养型产甲烷途径（HM）途径。据推测，CH 生成不同途径比例的变化是由于 H 注入增强了关键酶（辅酶 F 氢化酶和辅酶-B 亚硫酸乙基硫转移酶）所致。该集成系统代表了一种很有前途的方法，可以实现同时减少 CO 排放和生产生物天然气。
