Microwave assisted flocculation for harvesting of Chlorella vulgaris

Wei Liu; Yunqian Cui; Pengfei Cheng; Shuhao Huo; Xiaochen Ma; Qingfeng Chen; Kirk Cobb; Paul Chen; Junjian Ma; Xinguo Gao; Roger Ruan

doi:10.1016/j.biortech.2020.123770

Microwave assisted flocculation for harvesting of Chlorella vulgaris

Wei Liu, Yunqian Cui, Pengfei Cheng, Shuhao Huo, Xiaochen Ma, Qingfeng Chen, Kirk Cobb, Paul Chen, Junjian Ma, Xinguo Gao, Roger Ruan

Bioproducts and Biosystems Engineering

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Microalgae harvesting is a major hindrance for the development of the microalgae industry. In this paper, short microwave treatment was used to assist the flocculation of Chlorella vulgaris with three flocculants, Fe³⁺ (FeCl₃), chitosan, and Ca²⁺ (CaCl₂). A microwave irradiation time of 20 s, and a pH of 10 was found to be the optimum condition. The harvesting efficiency could be significantly increased by 43.2%, 49.5% and 39.6%, respectively for Fe³⁺, chitosan, and Ca²⁺ assisted by microwave under these conditions. Microwave treatment did not cause any damage to the algal cells, and had no obvious influence on the lipid extraction. Microwave treatment decreased the concentration of the flocculants in culture medium after flocculation; this treatment enabled the reuse of the supernatant. This study provides a new and promising method of improving the flocculation efficiency for microalgae harvesting, by using microwave energy.

Original language	English (US)
Article number	123770
Journal	Bioresource Technology
Volume	314
DOIs	https://doi.org/10.1016/j.biortech.2020.123770
State	Published - Oct 2020

Bibliographical note

Funding Information:
This work was supported by Major Science and Technology Innovation Projects in Shandong Province (2019JZZY010723); Funding for Study Abroad Program by the Government of Shandong Province (201802014); Foundation (No. ZZ20190118) of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences.

Funding Information:
This work was supported by Major Science and Technology Innovation Projects in Shandong Province (2019JZZY010723); Funding for Study Abroad Program by the Government of Shandong Province ( 201802014 ); Foundation (No. ZZ20190118) of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology , Shandong Academy of Sciences .

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

Chlorella vulgaris
Flocculation
Harvesting efficiency
Microwave

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title = "Microwave assisted flocculation for harvesting of Chlorella vulgaris",

abstract = "Microalgae harvesting is a major hindrance for the development of the microalgae industry. In this paper, short microwave treatment was used to assist the flocculation of Chlorella vulgaris with three flocculants, Fe3+ (FeCl3), chitosan, and Ca2+ (CaCl2). A microwave irradiation time of 20 s, and a pH of 10 was found to be the optimum condition. The harvesting efficiency could be significantly increased by 43.2%, 49.5% and 39.6%, respectively for Fe3+, chitosan, and Ca2+ assisted by microwave under these conditions. Microwave treatment did not cause any damage to the algal cells, and had no obvious influence on the lipid extraction. Microwave treatment decreased the concentration of the flocculants in culture medium after flocculation; this treatment enabled the reuse of the supernatant. This study provides a new and promising method of improving the flocculation efficiency for microalgae harvesting, by using microwave energy.",

keywords = "Chlorella vulgaris, Flocculation, Harvesting efficiency, Microwave",

author = "Wei Liu and Yunqian Cui and Pengfei Cheng and Shuhao Huo and Xiaochen Ma and Qingfeng Chen and Kirk Cobb and Paul Chen and Junjian Ma and Xinguo Gao and Roger Ruan",

note = "Funding Information: This work was supported by Major Science and Technology Innovation Projects in Shandong Province (2019JZZY010723); Funding for Study Abroad Program by the Government of Shandong Province (201802014); Foundation (No. ZZ20190118) of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences. Funding Information: This work was supported by Major Science and Technology Innovation Projects in Shandong Province (2019JZZY010723); Funding for Study Abroad Program by the Government of Shandong Province ( 201802014 ); Foundation (No. ZZ20190118) of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology , Shandong Academy of Sciences . Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

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AU - Liu, Wei

AU - Cui, Yunqian

AU - Cheng, Pengfei

AU - Huo, Shuhao

AU - Ma, Xiaochen

AU - Chen, Qingfeng

AU - Cobb, Kirk

AU - Chen, Paul

AU - Ma, Junjian

AU - Gao, Xinguo

AU - Ruan, Roger

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PY - 2020/10

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N2 - Microalgae harvesting is a major hindrance for the development of the microalgae industry. In this paper, short microwave treatment was used to assist the flocculation of Chlorella vulgaris with three flocculants, Fe3+ (FeCl3), chitosan, and Ca2+ (CaCl2). A microwave irradiation time of 20 s, and a pH of 10 was found to be the optimum condition. The harvesting efficiency could be significantly increased by 43.2%, 49.5% and 39.6%, respectively for Fe3+, chitosan, and Ca2+ assisted by microwave under these conditions. Microwave treatment did not cause any damage to the algal cells, and had no obvious influence on the lipid extraction. Microwave treatment decreased the concentration of the flocculants in culture medium after flocculation; this treatment enabled the reuse of the supernatant. This study provides a new and promising method of improving the flocculation efficiency for microalgae harvesting, by using microwave energy.

AB - Microalgae harvesting is a major hindrance for the development of the microalgae industry. In this paper, short microwave treatment was used to assist the flocculation of Chlorella vulgaris with three flocculants, Fe3+ (FeCl3), chitosan, and Ca2+ (CaCl2). A microwave irradiation time of 20 s, and a pH of 10 was found to be the optimum condition. The harvesting efficiency could be significantly increased by 43.2%, 49.5% and 39.6%, respectively for Fe3+, chitosan, and Ca2+ assisted by microwave under these conditions. Microwave treatment did not cause any damage to the algal cells, and had no obvious influence on the lipid extraction. Microwave treatment decreased the concentration of the flocculants in culture medium after flocculation; this treatment enabled the reuse of the supernatant. This study provides a new and promising method of improving the flocculation efficiency for microalgae harvesting, by using microwave energy.

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Microwave assisted flocculation for harvesting of Chlorella vulgaris

Abstract

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Keywords

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