A high-performance and low-cost strategy to harvest saltwater Chlorella vulgaris using cationic polyacrylamide coupled with bentonite
| Autor: | Wenqiang Yang, Xubing Sun, Jiayong Zhang, Yaohui You, Linjun Dai, Wang Heng, Wenjing Xiang, Lei He |
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| Rok vydání: | 2019 |
| Předmět: |
Sodium Bentonite
Chemistry Sepiolite 0208 environmental biotechnology Chlorella vulgaris Polyacrylamide Cationic polymerization 02 engineering and technology 010501 environmental sciences Pulp and paper industry 01 natural sciences 020801 environmental engineering chemistry.chemical_compound Adsorption Lipid extraction Bentonite Agronomy and Crop Science 0105 earth and related environmental sciences |
| Zdroj: | Algal Research. 41:101579 |
| ISSN: | 2211-9264 |
| Popis: | In this study, a high-performance and low-cost strategy to harvest saltwater Chlorella vulgaris using cationic polyacrylamide (CPAM) combined with clay particles was developed. The optimal harvesting efficiency when using CPAM alone was only 75% at a dosage of 10 mg/L after 20 min. However, five types of common clay particles, including sodium bentonite (BE), kaolin, diatomite, attapulgite, and sepiolite, could improve the harvesting efficiency of CPAM, and BE showed the best synergistic effect due to its excellent charge patch and bridging adsorption. Further investigation indicated that the optimal process of harvesting microalgae occurred when CPAM was added first followed by BE (CPAM-BE), and the harvesting efficiency was above 94% with a settling time of 3 min and a pH range of 4–10 when 1 mg/L CPAM and 80 mg/L BE were added. The flocs formed by CPAM-BE settled better and exhibited better anti-shear and regrowth abilities than those formed by CPAM alone. In addition, CPAM-BE had no negative effects on lipid extraction and culture medium reusability, and BE could be reused. |
| Databáze: | OpenAIRE |
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