Abstract
High biodegradability of food waste (FW) is a major problem in anaerobic digestion (AD) as it inhibits the process due to rapid acidification leading to very low pH levels. In order to overcome the problem, substrates possessing high C/N ratio can be used as co-substrate to offset the rapid acidification. In this study, rice husk (RH) has been used as co-substrate along with FW at two temperature regions, thermophilic and mesophilic, respectively. Various waste mixture combinations were formed based on total solid (TS%) content and FW percentage using Box-Behnken model. From the study, it was found that biogas produced from the co-digestion and temperature-phased reaction is higher than that of mono digestion and single temperature reaction. In this co-digestion, higher biogas production was found out by increasing the percentage of food waste in the mixture. Maximum biogas potential (729 mL) was achieved with mixture combination of FW (15% TS), RH (15% TS) and percentage of FW (50%). The experimental data were analysed using the chosen model had given the maximum biogas yield of 736 mL, which is very close to the result obtained from the experiments.
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Acknowledgements
The authors wish to thank Department of Biotechnology, Government of India, for funding this work (Sanction order No: BT/PR6328/GBD/27/387/2012) and Department of Civil Engineering, National Institute of Technology, Warangal, for providing support to carry out present work.
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Sahoo, S.R., Venkateswara Rao, P. (2019). Temperature-Phased Anaerobic Co-digestion of Food Waste and Rice Husk Using Response Surface Methodology. In: Rathinasamy, M., Chandramouli, S., Phanindra, K., Mahesh, U. (eds) Water Resources and Environmental Engineering II. Springer, Singapore. https://doi.org/10.1007/978-981-13-2038-5_14
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DOI: https://doi.org/10.1007/978-981-13-2038-5_14
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