New UV Technology for Poimt-of-Use Water Disinfection

摘要

A new class of semiconductor-based Deep Ultraviolet Light Emitting Diodes (DUV LEDs) is emerging as a disruptive technology for point-of-use water disinfection. Sensor Electronic Technology, Inc. has pioneered compact DUV lamps based on Ill-Nitride semiconductors (GaN, A1N, InN and their alloys). These semiconductor-based DUV light sources offer narrow spectral power distribution (<12 nm FWHM) with peak emission wavelengths from 227 nm to 340 nm. CW optical output power of up to 100 mW (at 275-280 nm wavelengths) can be achieved using a single, hermetically sealed lamp with a footprint of about 1 square inch. We report on a record-breaking performance of an all-LED point-of-use water disinfection system that utilizes our DUV lamps with peak emission wavelengths in the range from 270 nm to 280 nm. We demonstrated reduction of E. coli bacteria concentration by 5.5 LOG for 0.5 liter/min flow and 3 LOG reduction for 2 liter/min flow.