Perspectives on using pulsed electric field to enhance biogas yield in anaerobic digestion

Controlling large-scale biogas fermenters needs a deep understanding of the interaction between process parameters and microbiology. Therefore, monitoring of not only critical metabolic states of the microbial community, but also relationships between sub-processes is required. Once the process is understood, manipulation, for instance, by application of a brief, intense electric field in a controlled way can increase the methane yield. The electric treatment protocols depend not only on the location within the process, but also on the composition of the raw substrate and the process temperature. Besides the direct action of the electric field, side effects like shockwaves, Joule heating, electrowetting or the generation of reactive electrode byproducts can influence the effectiveness of the treatment.

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