Integrating 1G with 2G Bioethanol Production by Using Distillers’ Dried Grains with Solubles (DDGS) as the Feedstock for Lignocellulolytic Enzyme Production

First-generation (1G) bioethanol is one of the most used liquid biofuels in transport industry. It generated by using sugar- or starch-based feedstocks, while second-generation (2G) lignocellulosic feedstocks. Distillers’ dried grains with solubles (DDGS) a byproduct first-generation production current annual 22.6 million tons USA. DDGS rich fiber and valuable nutrients contents, which can be to produce lignocellulolytic enzymes such as cellulases hemicellulases for 2G production. However, needs pretreatment method dilute acid, ammonia soaking, steam hydrolysis release monosaccharides short-length oligosaccharides fermentable sugars use microbial media. These then induce growth enzyme compared only glucose xylose In addition, selection more suitable strains, work best production, also needed. Media optimization fermentation process strategies applied find optimum conditions needed Therefore, this review, summary all techniques compiled special focus on recent findings obtained previous pieces research conducted authors others literature. Furthermore, comparison other feedstocks improvement provided. Overall, acid proven better than methods, enhance considerable folds feedstock DDGS. Future studies further enhanced technoeconomic viability on-site manufacture ethanol plants, thus bridging two processes efficient corn plants.