NDLI: Characteristics of Biogas Production from Organic Wastes Mixed at Optimal Ratios in an Anaerobic Co-Digestion Reactor

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Characteristics of Biogas Production from Organic Wastes Mixed at Optimal Ratios in an Anaerobic Co-Digestion Reactor

Content Provider	MDPI
Author	Song, Young-Ju Oh, Kyung-Su Lee, Beom Pak, Dae-Won Cha, Ji-Hwan Park, Jun-Gyu
Copyright Year	2021
Description	This study determined the optimal mixing ratio of food waste and livestock manure for efficient co-digestion of sewage sludge by applying the biochemical methane potential (BMP) test, Design Expert software, and continuous reactor operation. The BMP test of sewage sludge revealed a maximum methane yield of 334 mL $CH_{4}$/g volatile solids (VS) at an organic loading rate (OLR) of 4 kg $VS/(m^{3}$·d). For food waste, the maximum methane yield was 573 mL $CH_{4}$/g VS at an OLR of 6 kg $VS/(m^{3}$·d). Livestock manure showed the lowest methane yield. The BMP tests with various mixing ratios confirmed that a higher mixing ratio of food waste resulted in a higher methane yield, which showed improved biodegradability and an improved VS removal rate. The optimal mixing ratio of 2:1:1 for sewage sludge, food waste, and livestock manure was determined using Design Expert 10. Using continuous co-digestion reactor operation under an optimal mixing ratio, greater organic matter removal and methane yield was possible. The process stability of co-digestion of optimally mixed substrate was improved compared with that of operations with each substrate alone. Therefore, co-digestion could properly maintain the balance of each stage of anaerobic digestion reactions by complementing the characteristics of each substrate under a higher OLR.
Starting Page	6812
e-ISSN	19961073
DOI	10.3390/en14206812
Journal	Energies
Issue Number	20
Volume Number	14
Language	English
Publisher	MDPI
Publisher Date	2021-10-18
Access Restriction	Open
Subject Keyword	Energies Environmental Engineering Sewage Sludge Food Waste Livestock Manure Anaerobic Co-digestion Mixing Ratio
Content Type	Text
Resource Type	Article

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