Abstract
Deep ultraviolet light emitting diodes (LED) were studied in water disinfection using Asterionellopsis glacialis as a model microorganism. Ultraviolet treatment reactors were constructed and LEDs with peak emission wavelengths 256, 262, 268, 274 and 278 nm and combinations 256 + 262, 262 + 268, 268 + 274 and 274 + 278 were investigated. The photosynthetic activity of the algae was measured using PAM fluorometry and flow cytometry. Dose-based efficiency evaluation with PAM fluorometry did not present any significant distinction between different wavelength LEDs, best performance being with 256 + 262 combination (0.0017 cm2/mJ). Best performance using flow cytometry analysis was observed with 256 nm LEDs. Best time-based performance with PAM fluorometry was observed using 274 and 278 nm LEDs with inactivation constants of 0.0715 and 0.0680 1/min respectively. The combination 274 + 278 nm performed best according to flow cytometry analysis with inactivation rate constant of 0.1296 1/min. The dose-based efficiency of lower wavelength LEDs can be significantly compensated with higher output power, lower energy consumption and longer lifetime of LEDs with higher wavelengths.
Original language | English |
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Pages (from-to) | 247-252 |
Number of pages | 6 |
Journal | Separation and Purification Technology |
Volume | 169 |
DOIs | |
Publication status | Published - 1 Sept 2016 |
Externally published | Yes |
Keywords
- Algae
- Asterionellopsis glacialis
- Disinfection
- Light emitting diodes
- Ultraviolet light
- Water treatment
ASJC Scopus subject areas
- Analytical Chemistry
- Filtration and Separation