Abstract
To improve the methane yield and digestate utilization of anaerobic digestion (AD), low-cost composited accelerants consisting of urea (0.2–0.5%), bentonite (0.5–0.8%), active carbon (0.6–0.9%), and plant ash (0.01–0.3%) were designed and tested in batch experiments. Total biogas yield (485.7–681.9 mL/g VS) and methane content (63.0–66.6%) were remarkably enhanced in AD systems by adding accelerants compared to those of control group (361.9 mL/g VS, 59.4%). Composited accelerant addition led to the highest methane yield (454.1 mL/g VS), more than double that of control group. The TS, VS, and CODt removal rates (29.7–55.3%, 50.9–63.0%, and 46.8–69.1%) for AD with accelerants were much higher than control group (26.2%, 37.1%, and 39.6%). The improved digestate stability and enhanced fertilizer nutrient content (4.95–5.66%) confirmed that the digestate of AD systems with composited accelerants could safely serve as a potential component of bioorganic fertilizer. These findings open innovative avenues in composited accelerant development and application.
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