Enhancing Biodegradability of Coffee Husk and Water Hyacinth Using Food Waste: Synergistic and Kinetic Evaluation Under Co-digestion

IF 3.1 3区工程技术 Q3 ENERGY & FUELS BioEnergy Research Pub Date : 2024-04-20 DOI:10.1007/s12155-024-10750-7

Mohammed Kelif Ibro, Venkata Ramayya Ancha, Dejene Beyene Lemma, Marcel Pohl

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Abstract

Considering the difficulty of digesting coffee husk (CH) and water hyacinth (WH) due to the lignin content, the present study investigated the influence of feedstock mixing ratios on the co-digestion performance of CH and WH with food waste (FW) at 38 ± 1 °C and its kinetics. Food waste was considered as co-substrate due to its ease of digestion. Batch experiments were conducted using CH/WH/FW ratios (100:0:0, 0:100:0, 35:35:30, 30:30:40, 25:25:50, 20:20:60, and 0:0:100 w/w) with total solids (TS) content of about 9.5% (w/v). The results indicated that the addition of FW significantly enhanced WH and CH digestion performance, with the maximum biogas yield of 572.60 \(\pm\) 2.30 mL/gVS, best synergistic effect of 1.5, highest biodegradability of 89.22%, and a biodegradation rate of 57.82% obtained at a mix ratio of 25:25:50, which was improved by 179.71% compared to CH mono-digestion. In addition, the organic conversion efficiency of TS and volatile solids reached 69.86 and 81.48%, respectively. Conversely, CH mono-digestion yielded the lowest biogas yield of 204.71 ± 10.74 mL/g VS, highlighting its unfeasibility. The modified logistic equation showed the best fit to the experimental data. The optimum CH/WH/FW ratio of 25:25:50 demonstrated the highest biogas yield and methane content at 66.30 ± 0.76%.

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利用厨余提高咖啡渣和水葫芦的生物降解性：协同消化下的协同效应和动力学评估

考虑到咖啡壳（CH）和水葫芦（WH）因含有木质素而难以消化，本研究调查了原料混合比对咖啡壳和水葫芦与厨余（FW）在 38 ± 1 °C下协同消化性能的影响及其动力学。由于厨余易于消化，因此将其视为共底物。使用 CH/WH/FW比例（100:0:0、0:100:0、35:35:30、30:30:40、25:25:50、20:20:60 和 0:0:100，总固体（TS）含量约为 9.5%（w/v））进行了批量实验。结果表明，FW的添加能显著提高WH和CH的消化性能，在混合比为25:25:50时，最大沼气产率为572.60/（pm/）2.30 mL/gVS，最佳协同效应为1.5，最高生物降解率为89.22%，生物降解率为57.82%，与CH单消化相比提高了179.71%。此外，TS 和挥发性固体的有机转化效率分别达到 69.86% 和 81.48%。相反，CH 单消化产生的沼气产量最低，仅为 204.71 ± 10.74 mL/g VS，凸显了其不可行性。修正的逻辑方程显示出与实验数据的最佳拟合。25:25:50 的最佳 CH/WH/FW 比率显示出最高的沼气产量和甲烷含量（66.30 ± 0.76%）。

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来源期刊

BioEnergy Research ENERGY & FUELS-ENVIRONMENTAL SCIENCES

CiteScore

6.70

自引率

8.30%

发文量

174

审稿时长

3 months

期刊介绍： BioEnergy Research fills a void in the rapidly growing area of feedstock biology research related to biomass, biofuels, and bioenergy. The journal publishes a wide range of articles, including peer-reviewed scientific research, reviews, perspectives and commentary, industry news, and government policy updates. Its coverage brings together a uniquely broad combination of disciplines with a common focus on feedstock biology and science, related to biomass, biofeedstock, and bioenergy production.