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Lignocellulose, algal biomass, biofuels and biohydrogen: a review

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Abstract

The high rate of depletion of fossil fuels and the negative effects caused by their use in industries and combustion engines are calling for biofuels. Alternatively, plant, algae and microbes are renewable biomasses for the generation of biofuels. Choosing a suitable biomass is of great importance for biofuel generation in good quantity and quality. Recently, molecular genetics has been implemented to increase biofuel productivity by improving desirable traits in plants, algae and microbes. Here, we review biofuel feedstocks with focus on lignocellulose, algae and microbes for production of biofuels, biogas and biohydrogen. We present genetic engineering approaches. Microalgae appear as the most promising species for combined biofuel production, wastewater treatment and CO2 fixation. Metabolic engineering can improve algal and microbial strains for the production of biofuels. Residual algal biomass can be recycled for the generation of other products.

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Abbreviations

ACCase :

Acetyl-CoA carboxylase

CoA :

Acetyl-coenzyme A

CO2 :

Carbon dioxide

CH4 :

Methane

FAME:

Fatty acid methyl esters

N2O:

Nitrous oxide

PSI:

Photosystem I, or plastocyanin–ferredoxin oxidoreductase

PSII:

Photosystem II, water-plastoquinone oxidoreductase

T. mathranii :

Thermoanaerobacter mathranii

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Acknowledgements

This work was financially supported by Bulgarian National Science Fund under Grant No. DN13/14/20.12.2017 and partially by the Operational Program “Science and Education for Smart Growth” 2014-2020, co-funded by the European Union through the European structural and investment funds: Project BG05M2OP001-1.002-0019 “Clean technologies for a sustainable environment–water, waste, energy for a circular economy” (Clean&Circle CoC) by funding of the expert's labor.

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Correspondence to Robert Penchovsky.

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Kaloudas, D., Pavlova, N. & Penchovsky, R. Lignocellulose, algal biomass, biofuels and biohydrogen: a review. Environ Chem Lett 19, 2809–2824 (2021). https://doi.org/10.1007/s10311-021-01213-y

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  • DOI: https://doi.org/10.1007/s10311-021-01213-y

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  1. Robert Penchovsky