Compacted Silage Fermentation on Whole Sweet Sorghum Plant for Distributed Bioethanol Production

摘要: The development of the bioethanol industry is facing a bottleneck due to challenges in the collection and storage of biomass. In this study, we explored the use of compacted silage fermentation to preserve whole pulverized sweet sorghum. To sterilize native and contaminant bacteria, we employed sulfur dioxide and inoculated SO2-tolerant Saccharomyces cerevisiae TSH4 for long-term preservation in an ethanol atmosphere. Bagged silage experiments present the most effective preservation dosage, which was 2000 ppm SO2 concentration and 2% TSH4 yeast inoculation. Based on these conditions, we found that compacted silage with different compaction densities enabled all fermentations to be completed within 60 days. The highest ethanol concentration is achieved at a compaction density of 600, at which ethanol conversion rate reaches to 93.4%. Higher compaction densities produce more leachate, which …