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Biotechnology Letters

, Volume 40, Issue 4, pp 697–702 | Cite as

Harvesting Chlorella vulgaris via rapid sedimentation induced by combined coagulants and tapered shear

  • Haiyang Zhang
  • Yang Ou
  • Ting Chen
  • Lan Yang
  • Zicheng Hu
Original Research Paper

Abstract

Objectives

In this study, a rapid sedimentation induced by combined coagulants and gradual shear was developed to harvest Chlorella vulgaris.

Results

The microalgal harvesting efficiency was observably promoted by the synergistic effect between FeCl3 and PAM, especially in the first 10 min. A higher harvesting efficiency, 95.61%, could be achieved within approximately 3 min due to the large and dense flocs generated by the combined coagulants. In contrast, the efficiencies were only 54.25 and 60.20% with FeCl3 and PAM, independently. When coagulation was performed under gradually reduced shear (from 50 to 30 rpm), smaller clusters or cells filled the pores of the aggregates via interception, which caused the flocs to become larger and more compact.

Conclusions

The sedimentation time was shortened to 30 s for microalgal coagulation induced by the simultaneous use of combined coagulants and tapered shear, providing an effective approach to harvesting microalgae.

Keywords

Chlorella vulgaris Coagulation Combined coagulants Gradual shear Microalgae harvesting Sedimentation 

Notes

Acknowledgements

The authors gratefully acknowledge the support of the Doctor Research Foundation of Southwest University of Science and Technology (14zx7130) and Foundation of Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education for Professional Innovation Research Team (14tdgk02).

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • Haiyang Zhang
    • 1
  • Yang Ou
    • 1
  • Ting Chen
    • 1
  • Lan Yang
    • 1
  • Zicheng Hu
    • 1
  1. 1.Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of EducationSouthwest University of Science and TechnologyMianyangChina

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