College of Engineering, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture and Rural Affairs, Wuhan 430070, PR China.
College of Engineering, Huazhong Agricultural University, No.1, Shizishan Street, Hongshan District, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture and Rural Affairs, Wuhan 430070, PR China.
Waste Manag. 2021 Sep;133:1-9. doi: 10.1016/j.wasman.2021.07.029. Epub 2021 Jul 29.
A novel system for simultaneous biogas upgrading, CO sequestration, and biogas slurry decrement was established by adding biomass ash into biogas slurry to form a renewable CO mixture absorbent. After CO saturation, the CO-rich mixture absorbent could be applied for plant growth. When the mass ratio of liquid to solid was 4:1, CO absorption capacity of this mixture absorbent reached up to 97.33 g-CO/kg-biomass-ash, which was about 135% higher than that of the biomass ash-water mixture. The highest value of 129.94 g-CO/kg-biomass-ash was obtained at a liquid-solid ratio of 99:1. When the TS concentration of anaerobic digestion feedstock was higher than 16 wt% and the water content of CO-rich absorbent was about 50 wt%, more than 80% of biogas slurry can be adsorbed by the biomass ash. If the biomass ash with a CO absorption capacity of 100 g-CO/kg was adopted and its transportation distance was less than 45 km, the biogas upgrading cost could be lower than the global average level (about RMB¥ 0.7/Nm-biogas) when using the novel system proposed in this study.
通过向沼气浆中添加生物质灰来形成可再生的 CO 混合吸收剂，建立了一种同时进行沼气升级、CO 捕集和沼气浆减量的新型系统。CO 饱和后，富 CO 的混合吸收剂可用于植物生长。当液固比为 4:1 时，该混合吸收剂的 CO 吸收能力高达 97.33 g-CO/kg-生物质灰，比生物质灰-水混合物高约 135%。在液固比为 99:1 时，获得了 129.94 g-CO/kg-生物质灰的最高值。当厌氧消化原料的 TS 浓度高于 16 wt%且富 CO 吸收剂的含水量约为 50 wt%时，超过 80%的沼气浆可被生物质灰吸附。如果采用 CO 吸收能力为 100 g-CO/kg 的生物质灰，且其运输距离小于 45 km，则当使用本研究提出的新型系统时，沼气升级成本可能低于全球平均水平（约 0.7 人民币/Nm-沼气）。
