The vinasse is a polluting effluent generated in large quantities in the ethanol production process, whose disposition is problematic and costly. In this work, the vinasse problem is addressed through a comparison between four alternatives for treating it with energy recovery: (i) concentration in an evaporator system until 25 Brix for volume reduction (CONC); (ii) concentration in an evaporator system until 65 Brix, with subsequent incineration of concentrated vinasse (CONC + INC); (iii) anaerobic biodigestion (BIOD); and anaerobic biodigestion and digestate treatment by membranes (BIOD + MEM). The techno-economic assessment is performed through mass and energy balances, evaluating two configurations of the cogeneration system: considering back-pressure (BPST) and condensing-extraction (CEST) steam turbines, in combination with an economic feasibility evaluation. Furthermore, an evaluation of GHG emission was performed in each case. The BIOD + MEM and CONC cases promoted a significant reduction in effluent volume (53% and 82.8% respectively), while the CONC + INC case practically eliminated the disposal expenses of this effluent. Regarding the cogeneration system, the BIOD case presented the highest bagasse surplus (59.9 kg/t cane) for the BPTS configuration, while the CONC + INC case presented the highest electricity surplus (89.7 kWh/t cane) for the CEST configuration. As for the economic assessment, the cases CONC with BPST, and CONC + INC for both BPTS and CEST presented economic feasibility, while the GHG emission assessment indicates that the BIOD case with BPST is the option with the lowest emissions. A sensitivity analysis was also performed to evaluate eventual variations in market and operating conditions.

酒糟是乙醇生产过程中大量产生的污染性废水，其处理存在问题且成本高昂。在这项工作中，通过比较四种通过能量回收来处理酒糟的方法来解决酒糟问题：（i）在蒸发器系统中浓缩直至减少25糖度以减少体积（CONC）；（ii）在蒸发器系统中浓缩至65白利糖度，然后焚化浓酒糟（CONC + INC）；（iii）厌氧生物消化（BIOD）；膜进行厌氧生物消化和消化处理（BIOD + MEM）。技术经济评估通过质量和能量平衡进行，评估热电联产系统的两种配置：考虑背压（BPST）和冷凝抽汽（CEST）的蒸汽轮机，结合经济可行性评估。此外，在每种情况下都进行了温室气体排放评估。BIOD + MEM和CONC案件促进了废水量的显着减少（分别为53％和82.8％），而CONC + INC案件实际上消除了该废水的处理费用。对于热电联产系统，BIOD案例显示BPTS配置的甘蔗渣过剩最高（59.9 kg / t甘蔗），而CONC + INC案例显示的CEST配置的甘蔗渣过剩最高（89.7 kWh / t甘蔗）。至于经济评估，采用BPST的CONC和BPTS以及CEST的CONC + INC案例都具有经济可行性，而温室气体排放评估表明采用BPST的BIOD案例是排放最低的选择。