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Item type:Publication, Access status: with files , Operational Parameters of Biogas Plants: A Review and Evaluation Study(Multidisciplinary Digital Publishing Institute (MDPI), 2020-07-22); ; ; ; The biogas production technology has improved over the last years for the aim of reducing the costs of the process, increasing the biogas yields, and minimizing the greenhouse gas emissions. To obtain a stable and efficient biogas production, there are several design considerations and operational parameters to be taken into account. Besides, adapting the process to unanticipated conditions can be achieved by adequate monitoring of various operational parameters. This paper reviews the research that has been conducted over the last years. This review paper summarizes the developments in biogas design and operation, while highlighting the main factors that affect the efficiency of the anaerobic digestion process. The study’s outcomes revealed that the optimum operational values of the main parameters may vary from one biogas plant to another. Additionally, the negative conditions that should be avoided while operating a biogas plant were identified.Publicationtype: Journal ArticleScopus© Citations 96 413 323 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Optimizing the performance of a large scale biogas plant by controlling stirring process : a case studyThis work has investigated the effect of stirring on the performance of two anaerobic digesters for a period of six years. In each digester, two propellers and one hydro-mixer were installed. Five different stirring scenarios were tested and adopted for this large scale biogas plant. Agricultural residuals were used as feedstock for this biogas plant. The results showed that the optimization of the operating duration of the stirrers has led to an increase of the specific electricity yield and a reduction of the electricity consumed by the stirrers by 21.5% and 13.5%, respectively. Furthermore, the investigation found that the long turning off periods of the stirrers (45 min or longer) has led to a faster creation of sedimentation and lowering the biogas yield. The optimal operation durations were found to be 3–5 min with breaks of 25–30 min. The electricity yield and efficiency, as well as the homogeneity of the biodegradable feedstock in the fermenters, were used to evaluate the stirring scenarios. Moreover, a computational fluid dynamic model was used to assist in evaluating the stirring inside the fermenters at different total solid values and to examine the use of different mechanical stirring technologies on preventing the creation of dead zones.Publicationtype: Journal Article146