Environmental and Chemical Technology Group, Department of Chemistry, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Minas Gerais, Brazil; Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Campus Pampulha, Av. Antônio Carlos 6.627, Belo Horizonte, MG, Brazil.
Environmental and Chemical Technology Group, Department of Chemistry, Universidade Federal de Ouro Preto, 35400-000 Ouro Preto, Minas Gerais, Brazil.
Bioresour Technol. 2018 Apr;253:49-54. doi: 10.1016/j.biortech.2017.12.071. Epub 2017 Dec 26.
Residual coffee husks after seed processing may be better profited if bioconverted into energy through anaerobic digestion. This process may be improved by implementing a pretreatment step and by co-digesting the coffee husks with a more liquid biomass. In this context, this study aimed at evaluating the anaerobic co-digestion of coffee husks with microalgal biomass. For this, both substrates were pretreated separately and in a mixture for attaining 15% of total solids (TS), which was demonstrated to be the minimum solid content for pretreatment of coffee husks. The results showed that the anaerobic co-digestion presented a synergistic effect, leading to 17% higher methane yield compared to the theoretical value of both substrates biodegraded separately. Furthermore, thermal hydrolysis pretreatment increased coffee husks anaerobic biodegradability. For co-digestion trials, the highest values were reached for pretreatment at 120 °C for 60 min, which led to 196 mLCH/gVS and maximum methane production rate of 0.38 d.
如果将种子加工后的剩余咖啡壳通过厌氧消化转化为能源，可能会获得更好的经济效益。通过实施预处理步骤并与更具流动性的生物质共消化，这一过程可能会得到改善。在这种情况下，本研究旨在评估咖啡壳与微藻生物质的厌氧共消化。为此，两种基质都分别进行了预处理，然后混合到总固体（TS）达到 15%，这被证明是预处理咖啡壳的最小固体含量。结果表明，厌氧共消化具有协同作用，与两种基质分别生物降解的理论值相比，甲烷产量提高了 17%。此外，热水解预处理提高了咖啡壳的厌氧生物降解性。对于共消化试验，预处理 120°C 60 分钟时达到最高值，这导致 196mLCH/gVS 和最大甲烷产率为 0.38d。
