Forest residues are an important source of biomass. Among these, Coffee Cut-Stems (CCS) are an abundant wood waste in Colombia obtained from coffee crops renovation. However, only low quantities of these residues are used directly in combustion processes for heating and cooking in coffee farms where their energy efficiency is very low. In the present work, an energy and environmental assessment of two bioenergy production processes (ethanol fermentation and gasification) using CCS as raw material was performed. Biomass gasification seems to be the most promising thermochemical method for bioenergy production whereas, ethanol fermentation is a widely studied biochemical method to produce biofuels. Experimental runs of the CCS gasification were carried out and the synthesis gas composition was monitored. Prior to the fermentation process, a treatment of the CCS is required from which sugar content was determined and then, in the fermentation process, the ethanol yield was calculated. Both processes were simulated in order to obtain the mass and energy balance that are used to assess the energy efficiency and the potential environmental impact (PEI). Moderate high energy efficiency and low environmental impacts were obtained from the CCS gasification. In contrast, high environmental impacts in different categories and low energy efficiencies were calculated from the ethanolic fermentation. Biomass gasification seems to be the most promising technology for the use of Coffee Cut-Stems with high energy yields and low environmental issues.

森林残留物是生物质的重要来源。其中，咖啡渣干（CCS）是哥伦比亚从咖啡作物翻新中获得的大量木材废料。但是，只有很少量的这些残留物直接用于燃烧效率较高的咖啡农场的燃烧过程中。在当前的工作中，对使用CCS作为原料的两个生物能源生产过程（乙醇发酵和气化）进行了能源和环境评估。生物质气化似乎是生物能源生产中最有前途的热化学方法，而乙醇发酵是一种广泛研究的生产生物燃料的生物化学方法。进行CCS气化的实验运行，并监测合成气的组成。在发酵过程之前，需要对CCS进行处理，从中确定糖含量​​，然后在发酵过程中计算出乙醇产量。为了获得质量和能量平衡，对这两个过程进行了模拟，以评估能量效率和潜在的环境影响（PEI）。通过CCS气化获得了适度的高能效和低环境影响。相反，通过乙醇发酵计算出不同类别的高环境影响和低能量效率。生物质气化似乎是使用具有高能量产量和低环境问题的Coffee Cut-Stems的最有前途的技术。为了获得质量和能量平衡，对这两个过程进行了模拟，以评估能量效率和潜在的环境影响（PEI）。通过CCS气化获得了适度的高能效和低环境影响。相反，通过乙醇发酵计算出不同类别的高环境影响和低能量效率。生物质气化似乎是使用具有高能量产量和低环境问题的Coffee Cut-Stems的最有前途的技术。为了获得质量和能量平衡，对这两个过程进行了模拟，以评估能量效率和潜在的环境影响（PEI）。通过CCS气化获得了适度的高能效和低环境影响。相反，通过乙醇发酵计算出不同类别的高环境影响和低能量效率。生物质气化似乎是使用具有高能量产量和低环境问题的Coffee Cut-Stems的最有前途的技术。通过乙醇发酵计算出不同类别的环境影响高，能源效率低。生物质气化似乎是使用具有高能量产量和低环境问题的Coffee Cut-Stems的最有前途的技术。通过乙醇发酵计算出不同类别的环境影响高，能源效率低。生物质气化似乎是使用具有高能量产量和低环境问题的Coffee Cut-Stems的最有前途的技术。