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Removal of Prorocentrum minimum from seawater using dissolved air flotation
As world water resources struggle to support a growing population, desalination is attracting more attention. High algal removal rates achieved by dissolved air flotation (DAF) can protect down-stream reverse osmosis membranes from fouling and shutting down during high-biomass harmful algal bloom events. This study was designed to investigate the factors affecting algal cell removal using DAF in a simulated bloom of the dinoflagellate Prorocentrum minimum. The addition of sodium hypochlorite and adjustment of the pH were also investigated as ways to reduce coagulant dosage. Prorocentrum minimum presented a negatively charged surface. The optimum FeCl 3 dose was 60 mg/L at the lowest density tested (∼5×103 cells/mL), removing 90% of cells. At a higher density (40–50×103 cells/mL), 90 mg/L of FeCl 3 removed over 90% of the cells. Results suggest that the dominant mechanism for P. minimum removal was sweeping flocs, with charge neutralization constituting an important step. Adding 1 mg/L of sodium hypochlorite may have reduced surface charge. pH appeared to be a determining factor for total organic carbon (TOC) removal. At a lower pH, TOC removal was maintained at 70% while the coagulant dosage was reduced by half and algae removal was not compromised.
Removal of Prorocentrum minimum from seawater using dissolved air flotation
As world water resources struggle to support a growing population, desalination is attracting more attention. High algal removal rates achieved by dissolved air flotation (DAF) can protect down-stream reverse osmosis membranes from fouling and shutting down during high-biomass harmful algal bloom events. This study was designed to investigate the factors affecting algal cell removal using DAF in a simulated bloom of the dinoflagellate Prorocentrum minimum. The addition of sodium hypochlorite and adjustment of the pH were also investigated as ways to reduce coagulant dosage. Prorocentrum minimum presented a negatively charged surface. The optimum FeCl 3 dose was 60 mg/L at the lowest density tested (∼5×103 cells/mL), removing 90% of cells. At a higher density (40–50×103 cells/mL), 90 mg/L of FeCl 3 removed over 90% of the cells. Results suggest that the dominant mechanism for P. minimum removal was sweeping flocs, with charge neutralization constituting an important step. Adding 1 mg/L of sodium hypochlorite may have reduced surface charge. pH appeared to be a determining factor for total organic carbon (TOC) removal. At a lower pH, TOC removal was maintained at 70% while the coagulant dosage was reduced by half and algae removal was not compromised.
Removal of Prorocentrum minimum from seawater using dissolved air flotation
Zhu, Ivan X. (author) / Bates, Brian J. (author) / Anderson, Donald M. (author)
2014-01-02
10 pages
Article (Journal)
Electronic Resource
English
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