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Solid-state anaerobic co-digestion of organic fraction of municipal waste and sawdust: impact of co-digestion ratio, inoculum-to-substrate ratio, and total solids

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Abstract

Municipal solid waste contains mainly organic wastes that can be a good source for anaerobic digestion. Solid-state anaerobic digestion is an affordable and suitable technique to mitigate the organic fraction of municipal solid waste (OFMSW). However, as the organic loading of OFMSW is high, co-digestion with other materials can improve the system's performance. This study aimed to investigate the performance of the co-digestion of OFMSW and sawdust and study the parameters affecting its performance. Based on the experiments, the optimum sawdust/OFMSW ratio was achieved 1:2 with the methane production of 0.3 L/g VS. In addition, the inoculum-to-substrate ration (I/S) was investigated at 1:4, 1:2, 1:1, 2:1 ratios. The best result was obtained at 2:1 ratio with a total methane yield of 0.28 L/g VS. The results also indicated that I/S ratios less than 1:1 led to fatty acid accumulation and acidic pH condition. The effect of total solids content on the co-digestion process was also examined in this study. According to the results, as the total solids increased, the biomethane yield decreased while the biogas content increased.

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The authors declare that all the data are available and original.

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Acknowledgements

The authors would like to acknowledge the Tarbiat Modares University, faculty of civil and environmental engineering to fund this project.

Funding

This research was funded by Tarbiat Modares University for master thesis.

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Conceptualization: FZ, NM; Methodology: FZ; Formal analysis and investigation: FZ; Writing—original draft preparation: KPN; Writing—review and editing: KPN; Supervision: NM.

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Correspondence to Nader Mokhtarani.

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Ziaee, F., Mokhtarani, N. & Pourrostami Niavol, K. Solid-state anaerobic co-digestion of organic fraction of municipal waste and sawdust: impact of co-digestion ratio, inoculum-to-substrate ratio, and total solids. Biodegradation 32, 299–312 (2021). https://doi.org/10.1007/s10532-021-09937-y

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  • DOI: https://doi.org/10.1007/s10532-021-09937-y

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