Recovering bioenergy through anaerobic digestion (AD) has become the most attractive waste management approach in modern industrial plants, because both the environmental adequacy and the provision of clean biogas-derived energy can be successfully met. Recent investigations have particularly shown the energetic benefits of residue co-digestion in sugarcane biorefineries, which significantly enhances biogas production compared to mono-digestion schemes. This work carried out an economic analysis to assess the feasibility of producing biogas from residues co-digestion in an integrated 1G2G (first and second generation) ethanol biorefinery and its application in electricity and biomethane (BioCH₄) production. Scenarios considered the mono-digestion of 1G vinasse in the season (MD1-base scenario), the mono-digestion of 1G vinasse in the season followed by the mono-digestion of 2G vinasse in the off-season (MD2), the co-digestion of 1G vinasse, filter cake and deacetylation liquor in the season followed by the co-digestion of filter cake and deacetylation liquor in the off-season (CD1), and finally the co-digestion of 1G vinasse, filter cake and deacetylation liquor in the season followed by the mono-digestion of 2G vinasse in the off-season (CD2). The scenarios comparison aimed to investigate the potential to implement year-round biogas production in sugarcane processing plants. The results showed that co-digestion-based scenarios (CD1 and CD2) had the best performance for producing both electricity and BioCH₄ from biogas, with the higher profitability related to the latter. Scenario MD1 scenario presented a negative net present value (NPV) for both electricity and BioCH₄ production, whilst only BioCH₄ production would be profitable in scenario MD2. The NPV for electricity production in scenario CD2 reached USD 9 million (4-fold higher than mono-digestion of 1G vinasse reported in the literature), whilst a peak of USD 45 million was calculated for BioCH₄ production. In addition, the current bioelectricity production from bagasse burning showed to be much more economically unfavorable compared to biogas production and use. Biogas recovery from residue co-digestion has been increasingly confirmed as an attractive alternative for energy generation within 1G2G ethanol biorefineries, maintaining year-round production and consisting of a robust BioCH₄ source, with great potential to be used both as a biofuel to supply the plant’s fleet and to replace natural gas via injection into the grid.

通过厌氧消化 (AD) 回收生物能源已成为现代工业厂房中最具吸引力的废物管理方法，因为可以成功满足环境充足性和清洁沼气衍生能源的提供。最近的研究特别显示了甘蔗生物精炼厂残留物共消化的能量优势，与单一消化方案相比，它显着提高了沼气产量。这项工作进行了一项经济分析，以评估在集成的 1G2G（第一代和第二代）乙醇生物精炼厂中通过残留物共消化生产沼气的可行性及其在电力和生物甲烷 (BioCH ₄ ) 生产中的应用。情景考虑了 1G 酒糟在季节中的单一消化（MD1-base scenario），当季 1G 酒糟单一消解，淡季 2G 酒糟单一消解（MD2），当季 1G 酒糟、滤饼和脱乙酰液共同消解淡季( CD1 )滤饼和脱乙酰液共消解，淡季1G酒糟、滤饼和脱乙酰液共消解，休季2G酒糟单消解-季节（CD2）。情景比较旨在调查在甘蔗加工厂实施全年沼气生产的潜力。结果表明，基于共消化的情景（CD1和CD2_{) 在利用沼气生产电力和 BioCH 4}方面表现最佳，后者具有更高的盈利能力。情景MD1情景呈现了电力和 BioCH ₄生产的负净现值 (NPV) ，而在情景MD2中只有 BioCH ₄生产是有利可图的。情景CD2中电力生产的 NPV达到 900 万美元（比文献中报道的 1G 酒糟的单一消化高 4 倍），而 BioCH _{4的计算峰值为 4500 万美元}生产。此外，与沼气生产和使用相比，目前通过甘蔗渣燃烧生产生物电在经济上不利得多。从残留物共消化中回收沼气已越来越多地被证实是 1G2G 乙醇生物精炼厂内产生能源的有吸引力的替代方案，维持全年生产并由强大的 BioCH ₄来源组成，具有巨大的潜力，既可以用作生物燃料来供应工厂的车队，并通过注入电网来替代天然气。