Abstract
Anaerobic digestion (AD) is an efficient and eco-friendly process for the biodegradation of various organic biomass which could potentially produce biomethane and results in no waste accumulation. The palm oil industry concurrently produces three types of possible organic pollutants namely palm oil mill effluent (POME), palm empty fruit bunch fiber (PEFF) and oil palm decanter cake (OPDC). Therefore, this work aimed to study the anaerobic mono- and co-digestion of the substrates from palm industry. Results revealed that the co-digestion of PEFF + POME + OPDC resulted in highest cumulative methane yield of 0.40 L CH4/(g VS added); 0.28 L CH4/(g VS added) from PEFF + POME and 0.27 L CH4/(g VS added) from POME + OPDC. The methane content in biogas and volatile solid (VS) reduction from all the mono- and co-digestion experiments were found to be in the range of 69–71.5% and 40–75%, respectively. These results suggest that the co-digestion of these substrates is superior in biogas yield than mono-digestion. Further, the kinetic parameters were evaluated using the modified Gompertz model equation to determine the lag phase of the process and the maximum biogas generation rate from all the reactors, R2 in all the cases was found to be > 0.95. Next-generation sequencing analysis illustrated wide variety of dominant bacterial species belonging to phylum Firmicutes, Bacteroidetes, Proteobacteria and Chloroflexi. Hydrogenotrophic methanogenesis and acetoclastic methanogenesis were the prevailing methane-generating pathway involved that can be confirmed by the abundance of genus Methanospirillum and Methanothrix, Methanosarcina.
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Acknowledgements
The authors are thankful to the Director of CSIR-Indian Institute of Chemical Technology (IICT) for the support for carrying out this research (IICT/Pubs./2022/039). The authors are grateful to Department of Science and Technology (DST) for providing the INSPIRE-SRF fellowship to Mr. Naveen Kumar Mamindlapelli [IF 190106]. The authors are also thankful to Council of Scientific and Industrial Research (CSIR) for providing the SRF fellowship to Ms. Vijaya Lakshmi Arelli (31/014(2795)/2019-EMR-1). The authors are also thankful to Department of Biotechnology and M/s Global Environmental Services Private Limited (GESPL) for sponsoring the project and financial support.
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Naveen Kumar Mamindlapelli contributed to methodology, formal analysis and writing—original draft. Vijayalakshmi Arelli and Avinash Jukanti contributed to formal analysis and writing—original draft. Ramakrishna Maddala contributed to review. Gangagni Rao Anupoju contributed to supervision, writing—review and editing and conceptualization.
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Highlights
• Anaerobic co-digestion of POME, PEFF and OPDC.
• Highest methane yield of 0.40 L CH4/(g VS added) for co-digestion of POME, PEFF and OPDC.
• Metagenomic studies reveal the microbial diversity.
• Firmicutes are in DIET with hydrogenotrophic methanogens.
• Hydrogenotrophic and acetoclastic methanogenesis are the major CH4 pathway.
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Kumar Mamindlapelli, N., Arelli, V., Jukanti, A. et al. Anaerobic Co-digestion of Biogenic Wastes Available at Palm Oil Extraction Factory: Assessment of Methane Yield, Estimation of Kinetic Parameters and Understanding the Microbial Diversity. Bioenerg. Res. 16, 213–227 (2023). https://doi.org/10.1007/s12155-022-10472-8
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DOI: https://doi.org/10.1007/s12155-022-10472-8