Embed Size (px)
Citation preview
New UV sources and their possible applications Oliver Lawal , Matthias Boeker Aquionics Inc. Unesco IHE – UV disinfection in developing countries 6th November, 2014
Chemical-resistant-pathogen barrier
No Disinfection By-products
Chemical Free
Oxidation properties
Cost
30 Years of UV technology drivers
Chemical-resistant-pathogen barrier
No Disinfection By-products
Chemical Free
Oxidation properties
Cost
Wavelength compromise
Architecture constraints
Mercury content
Start time
Cost
Conventional UV Limitations
Alternative solutions?
Solutions
Filtration
UV-C LED
DPD
SODIS
Mechanically Robust
Small Footprint – flex. Architecture
“Tunable” wavelength
Mercury Free
Instant On-Off
Chemical-resistant-pathogen barrier
No By-products
Chemical Free
Oxidation properties
Cost
Cost
UV-C LED’s Provide Additive Drivers
UV LEDs in a nut shell ~ 40,000 LEDs per wafer
SMD package Electrical & Thermal
Interface
Advantages over conventional Hg lamps: Targeted performance
Source: EPA UV Disinfection Guidance Manual 2006
Peak of DNA absorbance is actually 263nm! 254nm is standard because of Mercury peak emittance
Advantages over conventional Hg lamps: Robustness & low power
No risk of damaging or breaking the LED lamps
Low power: it can be powered by a phone charger!
Advantages over conventional Hg lamps: Instant On/Off: Point-of-Use applications
Due to warm-up time, this is not possible with conventional UV lamps!
Advantages over conventional Hg lamps: Environmental impact
No special handling required No safe disposal required No need to change lamp every year No Mercury
UV-C LED vs. LP Mercury
Collimated beam results using UV-C LEDs show equivalence with LP lamp
Will it work ?
Can I replace Hg lamps with UV-C LEDs in a conventional UV reactor and expect that it will work ?
Design complexity and current limitations of UV-C LEDs
A complete set of new challenges compared to traditional UV Mercury lamps
UV LEDs limited power & efficiency
UV LEDs thermal management
New Reactor Design UV LEDs complexity of manufacturing (cost)
Courtesy of Hexatech
Application Areas Relative to Power and Wavelength
Analytical Instrumentation
Water Treatment Air/Surface Treatment
UV-C UV-B UV-A
10µW
/cm
²
10m
W/c
m² La
mp
Pow
er
Wavelength
UV-C UV-B UV-A
10µW
/cm
²
10m
W/c
m² La
mp
Pow
er
Wavelength
Analytical Instrumentation
Water Treatment
Applications Applied Commercial Products
PearlAero PearlAqua
PearlSense
Air/Surface Treatment .
25,000 GPD to 1.5 MGD 1.5 MGD to 20 MGD Parameter Influence / Effect Typical Range UV Transmittance
(UV-T)
Measure of UV absorption
Effects system sizing requirements
Drinking water > 80 %
Wastewater 50 – 70 %
UV Transmittance
Technical Specifications Light Source UV-LED (254nm)
Pathlength 10mm
Range 10-100%
Accuracy +/- 1.0%
Repeatability +/- 0.1%
Resolution 0.1%
Measuring Interval 60 seconds
Power Supply 24 VDC
Output 4 – 20 mA
Temperature Range 32 – 122 F (0 – 50 C)
Weight 1.39 lbs (630 g)
Dimensions 7.55” Height x 2.56” Diameter
(19.1 cm x 6.5 cm)
PearlAqua & future capabilities
Produces UV Dose of 60 mJ/cm² at 0.5 gpm with only 50 mW of optical power4
• Point-of-Use applications include: – ultrapure water generators – process water loops – medical sterilization equipment
Potential applications of UV LEDs
Domestic water applications
Solar powered clean water solutions for remote areas
Courtesy of SolarSpring
Top 3 Learnings
1. UV LEDs offers multiple advantages No mercury, Instant On, Robust, Flexible Architecture, Selectable Wavelength, Power Options
2. Technology requires different challenges to overcome Optics, Fluid Dynamics, Die quality, Packaging, Thermals, Electronics & Sensing
…to achieve acceptable capital & operating costs
3. Products and applications are doable today
Questions?
Matthias Boeker Sales Manager, EMEA [email protected] Mobile: +49 174 7777900 Office: +49 611 44575375
Appendix
Advantages over conventional Hg lamps: Summary
Attribute Conventional Mercury Lamp UV-C LED Implications
Mercury Content 20 — 200 mg None Safe disposal No special handling
Warm up Time 2 — 15 minutes Instantaneous Intermittent-flow friendly
Operating Surface Temp Polychromatic ~ 600°C Monochromatic ~100°C Same as process water Zero-flow friendly
Not fouling promoting
Architecture Cylindrical tube Point source Versatile implementation
Wavelength Polychromatic (200-300nm) Monochromatic (254nm)
Monochromatic “Selectable” (250—300nm) Targeted performance
Voltage Current 110 — 240V AC 0.5 — 2.0 Amps
6 — 30V DC 0.02 Amps
Battery/solar realistic option
Replacement Interval 1 — 2 Years 6 Months — 5 Years Application dependent
