Efficient microalgae harvesting mediated by polysaccharides interaction with residual calcium and phosphate in the growth medium
| Autor: | Yong Keun Chang, Bong-Soo Lee, Naim Rashid, Manoranjan Nayak |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Growth medium Ettlia Chlorella sp Flocculation biology Renewable Energy Sustainability and the Environment Strategy and Management chemistry.chemical_element Calcium Phosphate biology.organism_classification Polysaccharide Industrial and Manufacturing Engineering chemistry.chemical_compound chemistry Chelation Food science General Environmental Science |
| Zdroj: | Journal of Cleaner Production. 234:150-156 |
| ISSN: | 0959-6526 |
| DOI: | 10.1016/j.jclepro.2019.06.154 |
| Popis: | This study sets out to harvest microalgae through auto-flocculation by manipulating the interactive effect of calcium, phosphate, and polysaccharides (PSAs). The harvesting efficiency (H.E) of 91 ± 2.7% was achieved for Ettlia sp. through auto-flocculation. The H.E was attributed to the chelation of calcium and PSAs present in microalgae medium. In the absence of PSAs, the H.E reduced to 64 ± 05% only. The addition of phosphate (34 ± 0.13 mg L−1) increased the H.E to 73 ± 1.5%. Zeta-potential measurements showed that the harvesting was induced by charge neutralization and inter-particle bridging. The PSAs-based auto-flocculation was tested for Chlorella sp. too but it turned out the H.E of 51 ± 1.3% only. The flocculation did not take place when the co-harvesting of Ettlia sp. and Chlorella sp. was carried out. It is concluded that each microalgae specie shows different auto-flocculation mechanism due to variation in their PSAs characteristics. It triggers up the need for setting up a distinct protocol for different microalgae species to assess their auto-flocculation potential. |
| Databáze: | OpenAIRE |
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