Fermentation Biogas Production and its Combination with Hydrogen Production Using a Mixture of Livestock Manure and Straw: A Review

This review article considers publications dealing with biogas production from mixtures of livestock manure and corn straw. Emphasis is placed on factors affecting hydrogen production rate from the residual liquid after methane production. Simulations were carried out as a means to better understand published findings related to the production of hydrogen from biomass, cow manure, and corn stalks. This review focuses on the impact of different manure-to-stalk ratios on the yield and gas production efficiency during the process of biogas fermentation. Photosynthetic-anaerobic processing of biomass with combined hydrogen production technology and its process flow were considered, aiming to achieve the reuse of waste liquid. At the same time, research progress of the fermentation degradation mechanism of modified straw is reviewed, summarizing the key factors affecting the difference in biogas yield from livestock manure and straw mixed materials. In addition, this study also considers the synergistic mechanism of operating parameters such as fermentation temperature, inoculation concentration, inoculation amount, composting time, and the optimal ratio of raw materials. This study aims to open up new avenues for the efficient utilization of biomass energy and will delve deeper into this in subsequent research.