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Time-Resolved Kinetic Measurement of Microalgae Agglomeration for Screening of Polysaccharides-Based Coagulants/Flocculants.
- Source :
-
International journal of environmental research and public health [Int J Environ Res Public Health] 2022 Nov 07; Vol. 19 (21). Date of Electronic Publication: 2022 Nov 07. - Publication Year :
- 2022
-
Abstract
- Time-resolved monitoring of microalgae agglomeration facilitates screening of coagulants/flocculants (CFs) from numerous biopolymer candidates. Herein, a filtering-flowing analysis (FFA) apparatus was developed in which dispersed microalgal cells were separated from coagulates and flocs formed by CFs and pumped into spectrophotometer for real-time quantification. Polysaccharides-based CFs for Microcystis aeruginosa and several other microalgae were tested. Cationic hydroxyethyl cellulose (CHEC), chitosan quaternary ammonium (CQA) and cationic guar gum (CGG) all triggered coagulation obeying a pseudo-second-order model. Maximal coagulation efficiencies were achieved at their respective critical dosages, i.e., 0.086 g/g <subscript>M.a.</subscript> CHEC, 0.022 g/g <subscript>M.a.</subscript> CQA, and 0.216 g/g <subscript>M.a.</subscript> CGG. Although not active independently, bacterial exopolysaccharides (BEPS) aided coagulation of M. aeruginosa and allowed near 100% flocculation efficiency when 0.115 g/g <subscript>M.a.</subscript> CQA and 1.44 g/g <subscript>M.a.</subscript> xanthan were applied simultaneously. The apparatus is applicable to other microalgae species including Spirulina platensis , S. maxima , Chlorella vulgaris and Isochrysis galbana . Bio-based CFs sorted out using this apparatus could help develop cleaner processes for both remediation of harmful cyanobacterial blooms and microalgae-based biorefineries.
- Subjects :
- Biomass
Flocculation
Cations
Microalgae
Chlorella vulgaris
Subjects
Details
- Language :
- English
- ISSN :
- 1660-4601
- Volume :
- 19
- Issue :
- 21
- Database :
- MEDLINE
- Journal :
- International journal of environmental research and public health
- Publication Type :
- Academic Journal
- Accession number :
- 36361487
- Full Text :
- https://doi.org/10.3390/ijerph192114610