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Process intensification for the recovery of methane-rich biogas from dry anaerobic digestion of açaí seeds
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
Affiliation  

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。

图形概要

更新日期:2021-07-07
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