Abstract
The performance of dry anaerobic digestions of cow dung, pig manure, and their mixtures into different ratios were evaluated at 35 ± 1°C in single-stage batch reactors for 63days. The specific methane yields were 0.33, 0.37, 0.40, 0.38, 0.36, and 0.35LCH4/gVSr for cow dung to pig manure ratios of 1:0, 4:1, 3:2, 2:3, 1:4, and 0:1, respectively, while volatile solid (VS) and chemical oxygen demand (COD) removal efficiencies were 48.59, 50.79, 53.20, 47.73, 46.10, and 44.88% and 55.44, 57.96, 60.32, 56.96, 53.32, and 50.86%, respectively. The experimental results demonstrated that the co-digestions resulted in 5.10-18.01% higher methane yields, 2.03-12.95% greater VS removals, 2.98-12.52% greater COD degradation and so had positive synergism. The various mixtures of pig manure with cow dung might persuade a better nutrient balance and dilution of high ammonia concentration in pig manure and therefore enhanced digester performance efficiency and higher biogas yields. The dry co-digestion of 60% cow dung and 40% pig manure achieved the highest methane yield and the greatest organic materials removal efficiency than other mixtures and controls.
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