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Bioenergy recovery from Southern Tunisia’s organic wastes: analysis and kinetic modeling study of biomethane production
Biomass Conversion and Biorefinery ( IF 3.5 ) Pub Date : 2021-07-12 , DOI: 10.1007/s13399-021-01684-7
Mawaheb Mouftahi 1 , Nejib Hidouri 1 , Nawel Tlili 2 , Pietro Bartocci 3 , Francesco Fantozzi 3
Affiliation  

Tunisia, like many other countries in the world, suffers from a shortage of conventional energy resources. Further, it exhibits large and increasing volumes of organic wastes that cause environmental and health problems. In this study, the considered wastes consist of the organic fraction of municipal solid wastes (OFMSW), the olive mill wastewater (OMWW), and the chicken wastes (CW). These bio-wastes can therefore be valorized by a biological process such as the anaerobic digestion to satisfy on the one hand the energy demands and on the other hand, to reduce the environmental problems. Accordingly, the first aim of this work is to investigate the biomethane potential of the mentioned bio-wastes and to assess the energetic content of the obtained biomethane production. Secondly, a theoretical analysis is conducted by using the Buswell equation to predict the biomethane generation and to determine the biodegradability of the studied substrates mixture. Finally, the experimental findings are used to carry out a kinetic study, by using four kinetic models to assess their suitability to fit the present anaerobic digestion process. To do this, the biomethane potential estimation of these biomasses, under mesophilic conditions, is carried out at a laboratory scale by using the biochemical methane potential (BMP) tests. These testes are performed under an optimal substrate-to-inoculums ratio and a controlled temperature during the testing period at a laboratory scale. The experimental results show that the net yield of the biomethane from the studied bio-wastes mixture is equal to 0.384 Nm3/kg VS, which is equivalent to 130.29 Nm3 of biomethane, extracted from one ton of these bio-wastes mixture. The theoretical and the experimental results of the net produced biomethane show that the substrates mixture biodegradability is found equal to 66.89%. The studied kinetic models show good agreements with the experimental results, with a correlation coefficient R2 ≥ 95. It is found that the Gompertz model is the best one for predicting the anaerobic digestion process, due to the lowest root mean square prediction estimate (RMSPE) coefficient, as compared with the other studied kinetic models.

Graphical abstract



中文翻译:

从突尼斯南部有机废物中回收生物能源:生物甲烷生产的分析和动力学模型研究

与世界上许多其他国家一样,突尼斯也面临常规能源短缺的问题。此外,它展示了大量且不断增加的有机废物,这些废物会导致环境和健康问题。在本研究中,所考虑的废物包括城市固体废物的有机部分 (OFMSW)、橄榄厂废水 (OMWW) 和鸡肉废物 (CW)。因此,这些生物废物可以通过生物过程(例如厌氧消化)进行增值,一方面满足能源需求,另一方面减少环境问题。因此,这项工作的第一个目的是研究上述生物废物的生物甲烷潜力,并评估所获得的生物甲烷生产的能量含量。第二,通过使用 Buswell 方程进行理论分析来预测生物甲烷的产生并确定所研究底物混合物的生物降解性。最后,实验结果用于进行动力学研究,通过使用四种动力学模型来评估它们是否适合当前的厌氧消化过程。为此,在中温条件下,这些生物质的生物甲烷潜力估计是通过使用生化甲烷潜力 (BMP) 测试在实验室规模进行的。在实验室规模的测试期间,这些睾丸在最佳底物与接种物比例和受控温度下进行。实验结果表明,所研究的生物废物混合物中生物甲烷的净产率等于 0.384 Nm 实验结果用于进行动力学研究,通过使用四种动力学模型来评估它们是否适合当前的厌氧消化过程。为此,在中温条件下,这些生物质的生物甲烷潜力估计是通过使用生化甲烷潜力 (BMP) 测试在实验室规模进行的。在实验室规模的测试期间,这些睾丸在最佳底物与接种物比例和受控温度下进行。实验结果表明,所研究的生物废物混合物中生物甲烷的净产率等于 0.384 Nm 实验结果用于进行动力学研究,通过使用四种动力学模型来评估它们是否适合当前的厌氧消化过程。为此,在中温条件下,这些生物质的生物甲烷潜力估计是通过使用生化甲烷潜力 (BMP) 测试在实验室规模进行的。在实验室规模的测试期间,这些睾丸在最佳底物与接种物比例和受控温度下进行。实验结果表明,所研究的生物废物混合物中生物甲烷的净产率等于 0.384 Nm 在中温条件下,通过使用生化甲烷潜力 (BMP) 测试在实验室规模下进行。在实验室规模的测试期间,这些睾丸在最佳底物与接种物比例和受控温度下进行。实验结果表明,所研究的生物废物混合物中生物甲烷的净产率等于 0.384 Nm 在中温条件下,通过使用生化甲烷潜力 (BMP) 测试在实验室规模下进行。在实验室规模的测试期间,这些睾丸在最佳底物与接种物比例和受控温度下进行。实验结果表明,所研究的生物废物混合物中生物甲烷的净产率等于 0.384 Nm从一吨这些生物废物混合物中提取的3 /kg VS,相当于 130.29 Nm 3的生物甲烷。净产生的生物甲烷的理论和实验结果表明,底物混合物的生物降解性等于 66.89%。所研究的动力学模型与实验结果吻合良好,相关系数 R 2 ≥ 95。 发现 Gompertz 模型是预测厌氧消化过程的最佳模型,因为其均方根预测估计值 (RMSSPE) 最低) 系数,与其他研究的动力学模型相比。

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更新日期:2021-07-12
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