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Enhancement of the immobilization on microalgae protective effects and carbamazepine removal by Chlorella vulgaris

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Abstract

Carbamazepine (CBZ) has drawn extensive attention due to their environmental threats. In this study, polyvinyl alcohol-sodium alginate polymers to immobilize Chlorella vulgaris (FACHB-8) were used to investigate whether immobilization can facilitate microalgae to alleviate the CBZ stress and enhance CBZ removal. The results showed that after immobilized treatment, the biomass of microalgae increased by approximately 20%, the maximum level of malondialdehyde content decreased from 28 to 13 μmol/g, and the photosynthetic capacity of FV/FM recovered to 90% of the control group. The CBZ removal rate increased from 67 to 84% by immobilization at a CBZ concentration of 80 mg·L−1. The results indicated that immobilization technology can effectively protect microalgae from CBZ toxicity and improve the removal of CBZ, especially at high concentrations (> 50 mg/L). Biodegradation was the dominant pathway for microalgae to remove carbamazepine. This study added the understanding of the microalgae responses under immobilization and the interactions between immobilized microalgae and CBZ removal, thereby providing a novel insight into microalgae technology in high concentration wastewater treatments.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This research was funded by the National Natural Science Foundation of China (U2040209 and 51739002), the Fundamental Research Funds for Central Universities (B200202110), and the Excellent Scientific and Technological Innovation Team in Jiangsu Province.

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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Zulin Hua, Xue Bai, and Lu Liang. The first draft of the manuscript was written by Lu Liang and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Zulin Hua.

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The authors declare no competing interests.

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Responsible Editor: Gangrong Shi

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Highlights

• Immobilization improved 6 to 17% of carbamazepine removal by C. vulgaris.

•·Immobilization reduced oxidative stress and repaired photosynthesis in C. vulgaris.

•·The protective effect of immobilization was more apparent at high CBZ stress.

•·Biodegradation accounted for more than 80% of the total removal rate of carbamazepine.

•·Immobilization improves the proportion of biodegradation in the CBZ removal pathway.

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Liang, L., Bai, X. & Hua, Z. Enhancement of the immobilization on microalgae protective effects and carbamazepine removal by Chlorella vulgaris. Environ Sci Pollut Res 29, 79567–79578 (2022). https://doi.org/10.1007/s11356-022-21418-0

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  • DOI: https://doi.org/10.1007/s11356-022-21418-0

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