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Harvesting of Rhodotorula glutinis via Polyaluminum Chloride or Cationic Polyacrylamide Using the Extended DLVO Theory

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Abstract

Polyaluminum chloride (PAC) and cationic polyacrylamide (CPAM) play a crucial role for separating microorganisms from bulk media. However, the mechanism of adsorption between cells and flocculants remain to be further defined to improve the flocculation efficiency (FE) in extreme conditions. This study conducted the flocculation process of Rhodotorula glutinis induced by PAC and CPAM, firstly. The result demonstrated that CPAM possessed more efficient harvesting ability for R. glutinis compared to PAC. The difference of flocculation capacity was then thermodynamically explained by the extended DLVO (eDLVO) theory; it turned out that the poor harvesting efficiency of PAC was attributed to lacking of binding sites as well as low adsorption force within particles. Based on this, the FE of PAC to R. glutinis was mechanically enhanced to 99.84% from 32.89% with 0.2 g/L CPAM modification at an optimum pH of 9. Also, the paper will play a guiding role in the treatment of inorganic salt ions and organic matters in wastewater.

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Acknowledgments

The authors wish to express their thanks for the supports from the National Key Research and Development Program of China (2017YFB0306800) and the 111 project (B13005).

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Funding

This work is funded by the National Key Research and Development Program of China (2017YFB0306800) and the 111 project (B13005).

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Authors and Affiliations

  1. Beijing Key Lab of Bioprocess, National Energy R&D Center for Biorefinery, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, People’s Republic of China

    Peng Yin, Tong Yu, Jing Liu & Xu Zhang

  2. Academy of National Food and Strategic Reserves Administration, No.11 Bai Wan Zhuang Street, Xicheng District, Beijing, 100037, People’s Republic of China

    Peng Yin

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  1. Peng Yin
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  2. Tong Yu
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For the authors’ contribution, Peng Yin was responsible for the design of the experiment and the writing of the article. Tong Yu participated in the experiment, Xu Zhang and Tianwei Tan completed some Q & A.

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Correspondence to Xu Zhang.

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Yin, P., Yu, T., Liu, J. et al. Harvesting of Rhodotorula glutinis via Polyaluminum Chloride or Cationic Polyacrylamide Using the Extended DLVO Theory. Appl Biochem Biotechnol 193, 2717–2728 (2021). https://doi.org/10.1007/s12010-021-03549-1

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  • DOI: https://doi.org/10.1007/s12010-021-03549-1

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