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Efficient cultivation of Porphyridium purpureum integrated with swine wastewater treatment to produce phycoerythrin and polysaccharide

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Abstract

In the present study swine wastewater diluted at the different percentages (10%, 20%, 60%, and 100%) was used to cultivate the red alga Porphyridium purpureum to evaluate microalgal growth, nutrient removal and the production of polysaccharide and phycoerythrin. The results showed the dilution level significantly affected algal growth and nutrient removal. The best growth was in the swine wastewater diluted at 60% resulting in the highest biomass concentration of 9.44 ± 0.44 g L−1, and the corresponding removal efficiency of COD, total nitrogen (TN), total phosphorus (TP), and ammonia nitrogen (NH4+-N) reached up to 94.85 ± 0.08%, 92.69 ± 0.09%, 96.08 ± 0.02%, and 100 ± 0.00%, respectively. Moreover, the algal cells cultured in the wastewater produced high concentration of polysaccharide and phycoerythrin. Microalgae cultured in 10% swine wastewater produced the highest polysaccharide concentration of 2.16 ± 0.02 g L−1. The highest phycoerythrin concentration of 54.45 ± 4.76 mg L−1 was observed in the 60% swine wastewater group. The results showed that P. purpureum has great potential in treating wastewater and producing high-value byproducts, which is conducive to the development of the bio-circular economy.

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Data availability

All data generated or analyzed in the present study are available on reasonable request.

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Acknowledgements

We deliver sincere gratitude to Pro.Fan at the State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology for providing the microalgae species used in experiments.

Funding

This research was funded by the Nantong social livelihood science and technology project (MS12021024) and the Fundamental Research Funds for the Central Universities (No. B200201001).

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Aihua Zhang: Conceptualization, Investigation, Writing. Bo Feng: Investigation, Writing—Original Draft. Han Zhang: Data curation; Formal analysis. Jinshun Jiang: Investigation, Writing—Original Draft. Yi Du: Investigation, Writing—Original Draft. Zheng Cheng: Investigation, Writing—Original Draft. Daofeng Zhang: Investigation, Writing-Review & Editing. Jianke Huang: Conceptualization, Project administration, Supervision, Writing—Review & Editing.

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Zhang, A.H., Feng, B., Zhang, H. et al. Efficient cultivation of Porphyridium purpureum integrated with swine wastewater treatment to produce phycoerythrin and polysaccharide. J Appl Phycol 34, 2315–2326 (2022). https://doi.org/10.1007/s10811-022-02785-0

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