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Inorganic additives to increase methane generation during anaerobic digestion of livestock manure: a review

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Abstract

Recycling livestock manure provides energy and prevent pollution, yet actual transformation processes are limited in terms of performance and cost. Here, we review inorganic additives used to improve anaerobic digestion. Additives include minerals such as zeolite and magnetite, metals such as bulk and nanoparticles, industrial wastes, and pH-regulating additives. We focus on microbial mechanisms in terms of microbial growth, enzymes, interspecies electron transfer and microbial community, instead of the often reported physico-chemical mechanisms. Porous additives such as zeolites are well suited to removing ammonium. Iron-based metal additives are highly influencing microbial mechanisms.

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Acknowledgements

The research was supported by the National Natural Science Foundation of China (52079094), Project of State Key Laboratory of Water Resources & Hydropower Engineering Science (2020LF1003/2019HLG01), and International Visiting Program for Excellent Young Scholars of SCU.

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Correspondence to Lina Pang.

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Liu, X., Qi, L., Chatzisymeon, E. et al. Inorganic additives to increase methane generation during anaerobic digestion of livestock manure: a review. Environ Chem Lett 19, 4165–4190 (2021). https://doi.org/10.1007/s10311-021-01282-z

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  • DOI: https://doi.org/10.1007/s10311-021-01282-z

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