Comparison of Anaerobic Co-Digestion of Food Waste and Livestock Manure at Various Mixing Ratios under Mesophilic and Thermophilic Temperatures

Wonbae Lee (), Youngo Kim, Ho Kim and Moonil Kim ()
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Wonbae Lee: Bioresource Center, Institute for Advanced Engineering, 51 Goan-ro, Yongin City 175-28, Gyeonggi-do, Republic of Korea
Youngo Kim: Technology Research Center, Hyundai Engineering & Construction, 75, Yulgok-ro, Seoul 03058, Gyeonggi-do, Republic of Korea
Ho Kim: Bioresource Center, Institute for Advanced Engineering, 51 Goan-ro, Yongin City 175-28, Gyeonggi-do, Republic of Korea
Moonil Kim: Department of Civil & Environmental Engineering, Hanyang University ERICA Campus, 55 Hanyangdaehak-ro, Ansan City 426-791, Gyeonggi-do, Republic of Korea

Sustainability, 2024, vol. 16, issue 17, 1-17

Abstract: In this study, the optimum mixing ratio of food waste (FW) and livestock manure (LM) was investigated to improve the methane yield efficiency and prohibit the inhibition factors (organic loading rate and NH 4 + ) from inhibiting the anaerobic co-digestion of FW and LM under mesophilic and thermophilic conditions. The research involved the following: (I) the analysis of the characteristics of FW and LM, (II) the evaluation of the potential and toxicity of the anaerobic digestion of I have confirmed that there is no problem. FW and LM using the biochemical methane potential (BMP) and anaerobic toxicity assay (ATA) tests, (III) the evaluation of the anaerobic co-digestion of FW and LM using the BMP test, and (IV) the evaluation of the optimum mixing ratio using mathematical modeling. The characteristics of FW and LM were analyzed to evaluate the theoretical methane potential and inhibition factor. The BMP test was carried out to evaluate the concentration of the biodegradable organic matter, biogas production rate, and methane yield. The ATA test was carried out to evaluate the impact of the inhibition concentration. Ultimately, mathematical models, such as a first-order reaction and a modified Gompertz model, were implemented to evaluate the optimum mixing ratio for the anaerobic co-digestion of FW and LM. FW had a higher concentration of degradable organic matter than LM. The initial operational parameters of the anaerobic digestion were determined to be appropriate at an organic matter concentration of less than 2.5 g/L and a TN concentration of 2,000 mg/L. In conclusion, as a result of evaluation through mathematical models, it was determined that anaerobic microorganisms were more sensitive to inhibitory factors under the thermophilic condition than under the mesophilic condition, and the optimum mixing ratio of FW to LM was 5:1 (vol:vol) based on kinetic results (k: 0.080; B u : 0.23 L CH 4 /g VS added ; P: 100.84 mL; R m : 10.23 mL/day; λ: 1.44 days).

Keywords: organic waste; anaerobic co-digestion; biochemical methane potential; anaerobic toxicity assay; optimization (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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