Biomass Conversion and Biorefinery ( IF 3.5 ) Pub Date : 2021-07-06 , DOI: 10.1007/s13399-021-01698-1 William G. Sganzerla 1 , Larissa C. Ampese 1 , Thuanny A. C. Parisoto 1 , Tânia Forster-Carneiro 1
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Anaerobic digestion (AD) can be a suitable alternative for industrial waste treatment and energy recovery. In this study, the AD of açaí seeds was evaluated under mesophilic temperature and dry regime. The stirred-tank reactor, composed of açaí seeds (25%), inoculum (45%), and water (30%), was started up and operated in batch mode for 40 days. The results demonstrate that the total solids’ biodegradation reached 59.38%, and the accumulated biogas produced was higher than 6 L. A stable methane content was obtained after 22 days of digestion, with a composition of around 60%. The experimental methane yield (156.65 mL CH4 g−1 TS) was higher than the theoretical methane yield (116.36 mL CH4 g−1 TS), demonstrating that the dry AD process was favorable to methane production. From the biogas combustion in a heat and power unit, 21.88 kWh of electricity and 98.48 MJ of heat could be produced from 1 ton of açaí seeds submitted to dry AD, mitigating a total of 7.15 × 10−3 tCO2eq. From the proposed industrial process intensification, the adoption of dry AD could supply 43.19% of the energy required by the açaí processing industry. Hence, the AD can be a technological route for bioenergy recovery, contributing for reducing the açaí industry’s carbon footprint while promoting environmental, social, and economic benefits for the local sustainable development.
Graphical abstract
中文翻译：
从阿萨伊种子的干厌氧消化中回收富含甲烷的沼气的工艺强化
厌氧消化 (AD) 是工业废物处理和能源回收的合适替代方案。在这项研究中，阿萨伊种子的 AD 在中温和干燥条件下进行了评估。由阿萨伊种子 (25%)、接种物 (45%) 和水 (30%) 组成的搅拌釜反应器启动并以分批模式运行 40 天。结果表明，总固体生物降解率达到59.38%，产生的累积沼气高于6 L。经过22天的消化，甲烷含量稳定，组成约为60%。实验甲烷产量 (156.65 mL CH 4 g -1 TS) 高于理论甲烷产量 (116.36 mL CH 4 g -1TS)，表明干式 AD 工艺有利于甲烷生产。从热电装置中的沼气燃烧中，1 吨阿萨伊种子经过干燥 AD 可产生 21.88 kWh 的电力和 98.48 MJ 的热量，总共减少 7.15 × 10 -3 tCO 2eq。从提议的工业过程集约化来看，采用干式 AD 可以提供阿萨伊加工行业所需能源的 43.19%。因此，AD 可以成为生物能源回收的技术途径，有助于减少阿萨伊行业的碳足迹，同时促进当地可持续发展的环境、社会和经济效益。
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