Deep UV Light Emitting Diode Technology for compact Point-of-Use Water Disinfection Systems.

摘要

Deep Ultraviolet Light Emitting Diodes (DUV LEDS) have shown their effectiveness in microbial sterilization of drinking water. These semiconductor-based DUV light sources offer narrow spectral power distribution (<12 nm FWHM) with peak emission wavelengths from 227 nm to 340 nm. The efficiency up to 8% and CW optical output power of up to 100 mW (at 275-280 nm wavelengths) has been achieved by SET, Inc. using a single, hermetically sealed lamp with a footprint of about 1 square inch. This technology has been incorporated into a SETi next generation compact aluminum chamber with an internal volume of approximately 52 mL. A >5 LOG E.coli bacterial reduction at 100mL/minute was achieved with an output power of 18mW and >6 LOG at 28mW while an average of 5 LOG E.coli reduction was achieved at 200mL/minute with an output power of 28mW. The DUV LED chamber was also tested in its efficacy towards viral disinfection. MS2 bacteriophage was chosen to represent viral microbes. Average influent concentrations ranged in between 103-104 plaque forming units (pfu)/mL of deionized water. ]. Preliminary testing was carried out at a constant flow of 100mL/minute and an average 1.56 LOG reductions were achieved using an optical output power of approximately 28mW.