Fibrous material in feedlot waste fermented by Trichoderma viride

Area of Science:

• Agricultural Science
• Biotechnology
• Environmental Microbiology

Background:

• Feedlot waste presents a significant disposal challenge.
• Valorization of agricultural byproducts is crucial for sustainable practices.
• Microbial fermentation offers a pathway for waste stream treatment and resource recovery.

Purpose of the Study:

• To investigate the efficacy of Trichoderma viride QM9123 in fermenting feedlot waste fiber.
• To assess the impact of fermentation on fiber solids and carbohydrate content.
• To determine the optimal substrate conditions for enhanced cellulolytic enzyme production.

Main Methods:

• Isolation and fermentation of fiber from feedlot waste using Trichoderma viride QM9123.
• Analysis of changes in fiber solids and carbohydrate composition post-fermentation.
• Evaluation of cellulolytic enzyme production using alkali pretreated and untreated fiber substrates with varying hemicellulose-to-cellulose ratios.

Main Results:

• Fermentation with Trichoderma viride QM9123 at up to 16.7% solids resulted in a 32% decrease in fermented fiber solids.
• Carbohydrate content was reduced by 60% following the fermentation process.
• Cellulolytic enzyme production was significantly improved with alkali pretreated fiber substrates exhibiting a lower hemicellulose-to-cellulose ratio.

Conclusions:

• Trichoderma viride QM9123 fermentation is a viable method for reducing solids and carbohydrates in feedlot waste.
• Alkali pretreatment and a low hemicellulose-to-cellulose ratio are key factors for optimizing cellulolytic enzyme production from fermented feedlot waste fiber.
• This study highlights the potential for biorefining agricultural waste streams for enzyme production.