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. 2022 Dec;29(60):91345-91355.
doi: 10.1007/s11356-022-22165-y. Epub 2022 Jul 27.

Effect of different CO2 concentrations on biogas upgrading and nutrient removal by microalgae-fungi co-culture

Bing Xu  1 , Yongjun Zhao  2 , Chunzhi Zhao  3 , Jing Wei  4
Affiliations

Effect of different CO2 concentrations on biogas upgrading and nutrient removal by microalgae-fungi co-culture

Bing Xu et al. Environ Sci Pollut Res Int. 2022 Dec.

Abstract

Owing to the high carbon dioxide (CO2)-fixation efficiency, microalgae-based technology has been widely used for biogas purification. The present study explored the effect of CO2 concentration on biogas purification by an algal-fungal-bacterial symbiotic system. Two algal-fungal-bacterial symbiotic systems were cultivated to purify four simulated biogas samples with different CO2 concentrations. The results showed that GR24, a synthetic analog of strigolactone, stimulated the growth of the algal-fungal-bacterial symbiotic system. The optimal CO2 concentration for the purification of the simulated biogas was 45% (V/V), and the optimal symbiotic system was Chlorella vulgaris-Ganoderma lucidum-endophytic bacteria-GR24. The maximum chemical oxygen demand (COD; 82.61 ± 7.73%), total nitrogen (TN; 81.36 ± 7.97%), total phosphorus (TP; 85.69 ± 8.19), and CO2 (69.23 ± 6.56%) removal efficiencies were detected with the addition of 10-9 M GR24 to the C. vulgaris-G. lucidum-endophytic bacterial symbiotic system. These findings confirmed the effect of CO2 concentration on the purification of biogas by the algal-bacterial symbiotic system. The study provides a theoretical basis for further research on the treatment of wastewater and biogas.

Keywords: Chlorella vulgaris; Endophytic bacteria; Ganoderma lucidum; Photosynthetic performance; Plant hormone; Removal efficiency.

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