School of Chemistry & Chemical Engineering, Queens University Belfast, BT9 5AG, UK; Sustainable Environment Research Centre, University of South Wales, CF37 4BB, UK.
School of Chemistry & Chemical Engineering, Queens University Belfast, BT9 5AG, UK; Bernal Institute, University of Limerick, V94T9PX, Ireland.
Bioresour Technol. 2022 Oct;361:127663. doi: 10.1016/j.biortech.2022.127663. Epub 2022 Jul 21.
Anaerobic digestion can potentially valorise sugarcane bagasse to biogas and fertiliser. Pretreatment is however required to overcome recalcitrance and enhance the biogas yields. Literature reporting the investigation of various biomass pretreatments often use milled biomass as substrate rather than as-received fibrous biomass. This does not establish the true influence of the pretreatment type on biogas generation. Additionally, milling energy is also ignored when calculating net energy gains from enhanced biogas yields and are thus misleading. In this work, a vortex-based hydrodynamic cavitation device was used to enhance the biomethane yields from fibrous as-received biomass for the first time. Clear justification on why milled biomass must not be used as substrates for demonstrating the effect of pretreatment on biogas production is also discussed. The net energy gain from milled hydrodynamic cavitation pre-treated bagasse can be similar to as-received bagasse only when the specific milling energy is ≤700 kWh/ton.
厌氧消化有可能将甘蔗渣转化为沼气和肥料。然而，需要进行预处理才能克服其顽固性并提高沼气产量。文献报道了各种生物质预处理的研究，这些研究通常使用粉碎后的生物质作为底物，而不是原纤维生物质。这并不能确定预处理类型对沼气生成的真正影响。此外，在计算因沼气产量提高而带来的净能量增益时，也忽略了粉碎能量，这具有误导性。在这项工作中，首次使用基于涡流的水力空化装置来提高原纤维生物质的生物甲烷产量。文中还讨论了为什么必须不使用粉碎后的生物质作为底物来证明预处理对沼气生产的影响的原因。只有当特定的粉碎能量≤700 kWh/吨时，从粉碎的水力空化预处理甘蔗渣中获得的净能量增益才可能与原甘蔗渣相似。
