Abstract
Algae–bacteria symbiosis can promote the growth of microalgae and improve the efficiency of wastewater treatment. Attached culture is an efficient culture technique for microalgae, with benefits of high yield, low water consumption and easy harvesting. However, the promoting effects of bacteria on microalgae in attached culture are still unclear. In this study, different forms of a nitrogen-fixing bacteria, Azotobacter beijerinckii (including bacteria supernatant, live bacteria, and broken bacteria), were co-cultured with Chlorella pyrenoidosa in an attached culture system using wastewater as the culture medium. The results showed that the broken A. beijerinckii form had the best growth promotion effect on C. pyrenoidosa. Compared with the pure algae culture, the biomass of C. pyrenoidosa increased by 71.8% and the protein increased by 28.2%. The live bacteria form had the best effect on improving the efficiency of wastewater treatment by C. pyrenoidosa, with the COD, PO43− and NH4+–N removal rates increased by 20.8%, 18.5% and 8.9%, respectively, in comparison with the pure algae culture. The attached co-culture mode promoted the growth of C. pyrenodisa better than the suspended co-culture mode. This research offers a new way for improving microalgae biomass and wastewater treatment by attached algae–bacteria symbiont.
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Acknowledgements
The current study was partly funded by the Innovation Ability Improvement Project of Small and Medium-sized High-tech Company in Shandong Province (2022TSGC2199); Natural Science Foundation of Shandong Province (ZR2022MC204; ZR2019MB073); Major Science and Technology Innovation Projects in Shandong Province (2019JZZY010723); and National Natural Science Foundation of China (22176104).
Funding
This study was supported by the Innovation Ability Improvement Project of Small and Medium-sized High-tech Company in Shandong Province, 2022TSGC2199, Natural Science Foundation of Shandong Province, ZR2022MC204, ZR2019MB073, Major Science and Technology Innovation Projects in Shandong Province, 2019JZZY010723, and National Natural Science Foundation of China, 22176104.
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HD: conceptualization, data curation, formal analysis, and writing—original draft. WL: supervision, funding acquisition, data curation, and writing—review and editing. HZ: methodology and data curation. ZW: investigation. FF: data curation. LZ: data curation and investigation. HD: data curation and investigation. TX: data curation. XL: investigation. JM: data curation and investigation.
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Dong, H., Liu, W., Zhang, H. et al. Enhanced biomass production and wastewater treatment in attached co-culture of Chlorella pyrenoidosa with nitrogen-fixing bacteria Azotobacter beijerinckii. Bioprocess Biosyst Eng 46, 707–716 (2023). https://doi.org/10.1007/s00449-023-02855-8
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DOI: https://doi.org/10.1007/s00449-023-02855-8