Optimizing feed composition for improved methane yield during anaerobic digestion of cow manure based waste mixtures.
This study investigated methane yield via anaerobic digestion of multi-component substrates based on mixtures of biodegradable single-component substrates with cow dung as main component. Bench and full-scale digestion experiments were carried out for both single and multi-component substrates to identify the relationship between methane yield and substrate composition. Results from both bench- and full-scale experiments corresponded well and showed that using multi-component substrates increases the methane yield much more than what would be expected from digestion of single substrates. Process stability as indicated by gas production, pH and NH(4)(+) concentration variations were also improved by using multi-component substrates compared to digestion of single-component substrates. The results, thus, suggest that assessment of methane yield for multi-component substrates cannot reliably be based on methane yields for corresponding single-component substrates but should instead be measured directly.
Ashekuzzaman
S M
SM
Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, Aalborg, Denmark.
Poulsen
Tjalfe G
TG
D000641:Ammonia / Q000378:metabolism*; D000818:Animals; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D002417:Cattle; D003198:Computer Simulation; D003612:Dairying / Q000379:methods; D007220:Industrial Waste / Q000517:prevention & control*; D008372:Manure / Q000382:microbiology*; D008954:Models, Biological; D012037:Refuse Disposal / Q000379:methods*
D007220:Industrial Waste; D008372:Manure; D000641:Ammonia