Abstract
This study was directed at the investigation of technologies for treatment of water containing algal toxins at basic pH values. Ozonation, biofiltration and membrane filtration were examined for the removal of algal toxins, specifically microcystin-LR (MC-LR). Results indicate that, as expected, ozonation completely destroyed MC-LR in water, while biofiltration using naturally-occurring bacteria did not show a significant reduction in MC-LR concentration after eight days of contact time. More compelling were the membrane filtration results, which showed that water-affinity interactions were not the only governing factor influencing the removal of MC-LR by membranes. It was found that charge interactions between membranes and MC-LR played an important role in the rejection. MC-LR was completely removed from the feed water only by hydrophobic neutrally and positively charged membranes. Furthermore, due to charge interactions, MC-LR reversibly adsorbed to neutral hydrophobic membranes, but it irreversibly adsorbed to positive hydrophobic membranes.
| Original language | English |
|---|---|
| Pages (from-to) | 56-63 |
| Number of pages | 8 |
| Journal | Separation and Purification Technology |
| Volume | 194 |
| DOIs | |
| State | Published - Apr 3 2018 |
Bibliographical note
Funding Information:This work was supported by a Harmful Algal Bloom Research Initiative grant from the Ohio Department of Higher Education , and partially supported by the National Science Foundation under Cooperative Agreement No. 1355438 and by the NSF KY EPSCoR Program. In addition, the authors acknowledge Center of Membrane Sciences and PBI Performance Products Inc.
Publisher Copyright:
© 2017 Elsevier B.V.
Keywords
- Charge
- Hydrophobicity
- Microcystin-LR
- Nanofiltration
- Ozonation
- Ultrafiltration
ASJC Scopus subject areas
- Analytical Chemistry
- Filtration and Separation