Keywords

Biohydrogen generation via individual dark-or photo-fermentation as well as integrated dark-photo fermentation has gained significant maturity over the last few decades of extensive research and development at the laboratory scale and beyond-laboratory scale systems. This article thoroughly reviews performances of different pilot scale fermentative biohydrogen production systems to identify the major decisive parameters, hindrance factors and areas requiring research attention for devising strategies for further progress and betterment. Impact and correlation of several key factors like suitable dedicated microorganisms, specific operational parameters, type and design specialty of the bioreactors, degree of sterilization and anaerobiosis, mode of bioreactor operation and substrate feeding strategy for individual and integrated bioprocesses on the hydrogenesis potential are emphasized from the practical viewpoint of piloting. Waste reutilization potential and importance of optimization of the technological as well as economic factors of the pilot scale biohydrogen production processes have been underlined to instigate further augmentation.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

Biohydrogen generation through individual dark or photo-fermentation, as well as integrated dark-photo fermentation, has been extensively researched and developed at both laboratory and larger scales. This article reviews the performance of different pilot scale biohydrogen production systems, identifying key parameters, hindrance factors, and areas for further research and improvement. The practical aspects of suitable microorganisms, operational parameters, bioreactor design, sterilization, and substrate feeding strategies are emphasized. The potential for waste reutilization and the optimization of technological and economic factors in pilot scale biohydrogen production processes are also highlighted.