Biomethane production kinetics during the anaerobic co-digestion of Sargassum spp. and food waste using batch and fed-batch systems in Punta Cana, Dominican Republic
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引用次数: 1
Abstract
Collecting Sargassum spp. biomass and using it for the generation of renewable energy is a sustainable approach to mitigate the costs associated to this weed management. The biomethanation of this algal biomass with other organic waste to produce biogas promotes the integrated sustainable management of these materials while generating gaseous fuel for the tourism industry. The purpose of this work is to determine the percentage Sargassum spp. biomass during the anaerobic co-digestion of this brown algae with food waste that results in the best biogas composition, methane yield, production kinetics, and digestate. The biomethanation was conducted in 1200 L fed-batch and bench scale batch biodigestors and the kinetic parameters were estimated using the modified Gompertz model. The methane yield of Sargassum spp. and food waste combinations in 0.58 OLR at fed batch and 15 g/L organic load at batch were comparable. The methane yield produced in the 100% Sargassum spp. fed-batch anaerobic biodigester was 101.3 ± 23.6 N. L CH4/kg, but up to 615.5 ± 78.4 N. L CH4/kg in the 45% Sargassum spp. / 55% food waste biodigestor. The anaerobic co-digestion of Sargassum spp. and food waste in the batch system showed methane production rates as high as 14.6 ± 0.3 N.L CH4/kg.day. Higher H2S were detected in the biogas of the biodigesters fed with larger percentages of the Sargassum spp. with more than 5000 ppm during mono-digestion. Our results suggest that 55% Sargassum spp. and 45% food waste are the most promising feed combination under the studied conditions for the anaerobic co-digestion of these feedstock at larger scale.
收集马尾藻的生物量并将其用于生产可再生能源是一种可持续的方法,可以减轻与这种杂草管理相关的成本。这种藻类生物质与其他有机废物的生物甲烷化产生沼气,促进了这些材料的综合可持续管理,同时为旅游业产生气体燃料。本研究的目的是确定褐藻与食物垃圾厌氧共消化过程中马尾藻生物量的百分比,从而产生最佳的沼气组成、甲烷产量、生产动力学和消化。在1200 L进料间歇反应器和实验间歇反应器中进行了生物甲烷化反应,并利用改进的Gompertz模型对动力学参数进行了估计。马尾藻和食物垃圾组合在0.58 OLR和15 g/L有机负荷下的甲烷产量具有可比性。100%马尾藻补料间歇式厌氧沼气池的甲烷产气量为101.3±23.6 N. L CH4/kg, 45%马尾藻/ 55%食物垃圾厌氧沼气池的甲烷产气量为615.5±78.4 N. L CH4/kg。马尾藻与餐厨垃圾分批厌氧共消化的产甲烷率高达14.6±0.3 N.L CH4/kg.d。在单消化过程中,添加马尾藻百分比较大的沼气池的沼气中检测到较高的H2S,超过5000 ppm。结果表明,在研究条件下,55%马尾藻和45%食物垃圾是最有希望进行大规模厌氧共消化的饲料组合。
期刊介绍:
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