Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Review
. 2021 Jul 19;14(1):159.
doi: 10.1186/s13068-021-02012-x.

Optimization of biogas yield from lignocellulosic materials with different pretreatment methods: a review

Kehinde Oladoke Olatunji  1 , Noor A Ahmed  2 , Oyetola Ogunkunle  2
Affiliations
Review

Optimization of biogas yield from lignocellulosic materials with different pretreatment methods: a review

Kehinde Oladoke Olatunji et al. Biotechnol Biofuels. .

Abstract

Population increase and industrialization has resulted in high energy demand and consumptions, and presently, fossil fuels are the major source of staple energy, supplying 80% of the entire consumption. This has contributed immensely to the greenhouse gas emission and leading to global warming, and as a result of this, there is a tremendous urgency to investigate and improve fresh and renewable energy sources worldwide. One of such renewable energy sources is biogas that is generated by anaerobic fermentation that uses different wastes such as agricultural residues, animal manure, and other organic wastes. During anaerobic digestion, hydrolysis of substrates is regarded as the most crucial stage in the process of biogas generation. However, this process is not always efficient because of the domineering stableness of substrates to enzymatic or bacteria assaults, but substrates' pretreatment before biogas production will enhance biogas production. The principal objective of pretreatments is to ease the accessibility of the enzymes to the lignin, cellulose, and hemicellulose which leads to degradation of the substrates. Hence, the use of pretreatment for catalysis of lignocellulose substrates is beneficial for the production of cost-efficient and eco-friendly process. In this review, we discussed different pretreatment technologies of hydrolysis and their restrictions. The review has shown that different pretreatments have varying effects on lignin, cellulose, and hemicellulose degradation and biogas yield of different substrate and the choice of pretreatment technique will devolve on the intending final products of the process.

Keywords: Biogas; Hydrolysis; Lignocellulose; Methane; Pretreatments.

PubMed Disclaimer

Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Schematic structure of lignocellulose before and after pretreatment (Source: [12])
Fig. 2
Fig. 2
Conventional diagram of biogas generation and utilization (Source: [24])
Fig. 3
Fig. 3
A flowchart showing the biological stages of anaerobic digestion
See this image and copyright information in PMC

References

    1. Michaelides EE. Alternative energy sources. Green Energy Technol. 2012;20.
    1. Li P, Sakuragi K, Makino H. Extraction techniques in sustainable biofuel production: a concise review. Fuel Process Technol. 2019;193:295–303. doi: 10.1016/j.fuproc.2019.05.009. - DOI
    1. Alalwan HA, Alminshid AH, Aljaafari HAS. Promising evolution of biofuel generations. Subject review. Renew Energy Focus. 2019;28:127–139. doi: 10.1016/j.ref.2018.12.006. - DOI
    1. Scaramuzzino C, Garegnani G, Zambelli P. Integrated approach for the identification of spatial patterns related to renewable energy potential in European territories. Renew Sustain Energy Rev. 2019;1(101):1–13. doi: 10.1016/j.rser.2018.10.024. - DOI
    1. Pathak H, Jain N, Bhatia A, Mohanty S, Gupta N. Global warming mitigation potential of biogas plants in India. Environ Monit Assess. 2009;157(1–4):407–418. doi: 10.1007/s10661-008-0545-6. - DOI - PubMed

LinkOut - more resources