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Improving hydrogen recovery from anaerobic co-digestion of algae and food waste by high-pressure homogenisation pre-treatment

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Abstract

Lake algae can be digested anaerobically to produce hydrogen (H2), but the efficiency of actual processes is limited. Improving the hydrogen yield could be done by hydrolysis and tuning nutrients. Here, we pre-treated Taihu lake algae by high-pressure homogenisation; then, this product was co-digested with food waste for hydrogen recovery. Results showed that the average particle size of algae decreased to 65.48 μm after 60 MPa pre-treatment, which is 43.09% smaller than that the control. The disintegration degree rose from 1.54% to 23.13%, and the soluble chemical oxygen demand rose from 3.21 g/L to 11.20 g/L in wet algae after 100 MPa pre-treatment. The maximum hydrogen yield was 39.87 mL per g of volatile solids. The pre-treatment effect on hydrogen generation performance was not significant when the pressure exceeded 60 MPa. Overall, we observed that high-pressure homogenisation is a fast and efficient method for algae pre-treatment, thus promoting anaerobic co-digestion of wet algae and food waste for hydrogen bio-recovery.

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Abbreviations

TS:

Total solids

VS:

Volatile solids

VFA:

Volatile fatty acid

DD:

Disintegration degree

COD:

Chemical oxygen demand

SCOD:

Soluble chemical oxygen demand

EE:

Energy efficiency

SPSS:

Statistical product and service solutions

HCl:

Hydrogen chloride

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Acknowledgements

This work was supported by the Major Science and Technology Program for Water Pollution Control and Treatment (2017ZX07203-001), National Natural Science Foundation of China (31971385 and 51508230), National Key Research and Development Project of China (2019YFC1906304-03), the Hunan (Hu-Xiang) Youth Talent Program (2018RS3114) and the Fundamental Research Funds for the Central Universities (JUSRP22021). The authors would like to thank the language support of Mr. Samuel Ryan Chan-Fitzpatrick.

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Correspondence to Mingxing Zhao.

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Zhao, M., Xu, J., Xue, H. et al. Improving hydrogen recovery from anaerobic co-digestion of algae and food waste by high-pressure homogenisation pre-treatment. Environ Chem Lett 19, 3497–3504 (2021). https://doi.org/10.1007/s10311-021-01234-7

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  • DOI: https://doi.org/10.1007/s10311-021-01234-7

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