Kinetic study of biogas production from anaerobic digestion of vinasse waste
2021
A. Usmani | B. Pangkumhang | M. Wongaree | K. Wantala | R. Khunphonoi
Vinasse, a sugar-ethanol residue, is used as a substrate for biogas production. The characteristics of the vinasse wastewater used were 216,000 mg-COD/L, pH 4.1, and 68.42 mg/L volatile solids. The sludge/wastewater ratio was controlled at about 1.5−2.0, by weight. Biogas production enhancement was studied in relation to two parameters – Citadel BioCat + , a commercial biocatalyst containing a large microorganism population as the methanogenic bacteria source (5 and 10 g), and reaction temparature (30 and 37 °C). Biogas production kinetics were evaluated. The presence of the biocatalyst enhanced biogas production significantly, as well as reducing the time required for anaerobic digestion. The first-order kinetic model described the biodegradation process. The best results were found using 10 g of biocatalyst at 37 °C – i.e., the optimum results based on biogas production potential (A), the highest biogas production rate (U), the minimum biogas production time (λ), and kinetic organic biodegradability constants (k) of 102.71 mL/g-COD, 11.17 mL/g-COD/d, 0.95 day, and 0.0533 day−1, respectively. COD removal efficiency was up to 60%. Highlights The presence of a biocatalyst enhanced biogas production and reduced processing time.; Up to 60% of the COD from vinasse wastewater was degraded.; The biocatalyst can reduce the time required to produce biogas.;
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