Abstract
Solid-state anaerobic digestion is a promising path to optimize green energy generation from waste management. This mesophilic study investigated the performance of sodium hydroxide (4%NaOH), ammonium hydroxide (2%NH4OH, and 4%NH4OH), and calcium hydroxide (8%Ca(OH)2) pretreated corn stover (Cs) co-digested with dairy manure (Dm) to achieve 4%NaCsDm, 2%AqCsDm, 4%AqCsDm, and 8%CaCsDm treatments. Results showed that 8%CaCsDm had shortened detention time (79 days) and increased methane yield (178 L/kg VS) in comparison with other treatments. In addition, propionic acid concentration in treatment 4%NaCsDm was elevated beyond a safe threshold (> 0.9 g/L) for methanogens, which is unlike the significant bioconversion that occurred for other treatments. Though, free ammonia concentration for 2%AqCsDm and 4%AqCsDm pre-digestates were within the safe limit (< 53 mg/L) relative to other treatments, 8%CaCsDm sufficiently reduced the initial inhibitory concentration to a safe threshold at the cessation of the experiment. Additionally, 8%CaCsDm treatment had the highest VFA bioconversion rate (80%). Therefore, this study demonstrated that 8%CaCsDm treatment could effectively improve reactor performance in solid-state anaerobic co-digestion.
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Acknowledgements
Funding for this project by the Development Foundational Grant, North Dakota State University (NDSU), USA is highly appreciated. Also, support from NDSU Graduate School and Dean of CAFSNR are acknowledged. This work is also supported by the USDA National Institute of Food and Agriculture, Hatch project number ND01483. The Department of Animal Science at NDSU and the Animal Nutrition and Physiology Center (ANPC) are equally appreciated for providing space for the project.
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Ajayi-Banji, A.A., Rahman, S., Cihacek, L. et al. Comparison of the Reactor Performance of Alkaline-Pretreated Corn Stover Co-digested with Dairy Manure Under Solid-State. Waste Biomass Valor 11, 5211–5222 (2020). https://doi.org/10.1007/s12649-020-01116-z
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DOI: https://doi.org/10.1007/s12649-020-01116-z