UV-OXIDATION: TREATING WASTEWATER TO ...UV light penetrates the cell wall The UV energy permanently...
Transcript of UV-OXIDATION: TREATING WASTEWATER TO ...UV light penetrates the cell wall The UV energy permanently...
-
OWEA Aurora, Ohio
June 20th, 2012
UV-OXIDATION: TREATING WASTEWATER TO
DRINKINGWATER FOR SUSTAINABLE WATER
REUSE
-
UV/UV OXIDATION BASICS
-
WHAT IS UV LIGHT?
Ultraviolet (UV) light is
invisible to the human eye
UV is comprised of
electromagnetic radiation of
wavelengths ranging from
10 nm to 400 nanometers
(nm)
Certain wavelengths of UV
light are germicidal – meaning
they can neutralize
microorganisms
-
UV light penetrates the cell wall
The UV energy permanently alters the DNA structure of the microorganism
The microorganism is “inactivated” and unable to reproduce or infect
HOW DOES UV DISINFECT?
UV Energy
DNA
Nucleic Acid
Cell Wall
Cytoplasmic
Membrane
-
THE
INTERCONNECTED
WATER SUPPLY
Sources of contaminants in our water supply:
- Industrial discharge
- Agricultural runoff (Nutrients increase in Algae Blooms Taste and Odor, Algal Toxins)
- Chemical releases
- Municipal wastewater
Injection
Well
Extraction
Well
“One city’s wastewater is
another city’s drinking water”
-
WHAT IS UV-OXIDATION?
It is the process of destroying trace organic contaminants in water by:
UV-Photolysis
UV light alone breaks down the contaminant molecules
UV-Oxidation
UV light plus hydrogen peroxide (H2O2)
Hydrogen peroxide absorbs UV and produces hydroxyl radicals that
oxidize contaminants
-
UV-PHOTOLYSIS
Chemical bonds are
broken by UV light
-
UV-OXIDATION
Hydrogen
peroxide
Hydroxyl
radical
Chemical bonds are
broken by hydroxyl
radicals
-
UV-PHOTOLYSIS / UV-OXIDATION BALANCE
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
1,4-Dioxane NDMA Atrazine Geosmin
UV
-Ph
oto
lysis
/UV
-Oxid
ati
on
Co
ntr
ibu
tio
n t
o T
ota
l
Co
nta
min
an
t R
ed
ucti
on
(R
ela
tive t
o A
trazin
e)
UV + 10 ppm H2O2
Photolysis
-
TREATABILITY OF STEROIDS
Testing Performed in Partnership with Southern Nevada Water Authority – Special Thanks to Dr. Shane
Snyder
-
Testing Performed in Partnership with Southern Nevada Water Authority – Special Thanks to Dr. Shane Snyder
TREATABILITY OF ANTIBIOTICS
-
LAMP TECHNOLOGY
-
A WORD ON LAMP TECHNOLOGY
UV lamps are characterized by the mercury vapor pressure inside the
lamp, and the UV energy they produce:
Low-Pressure (LPHO)
This category includes amalgam lamps: an efficient, high output UV light source
Medium-Pressure
Extremely high UV output; capable of treating significant flow volumes
-
REACTOR DETAILS
-
REACTOR DETAILS LPHO
• Lamp power and number of
reactors in operation
automatically adjusted to
minimize power
• Reactors can be oriented 1-, 2-,
or 3-high for small footprint
• 250W LPHO lamp efficiently
treating contaminants year round
-
Two lamp bundles per chamber
(one accessed from each end)
Influent Port
Effluent Port
REACTOR DETAILS LPHO
-
REACTOR DETAILS MP
• Lamp power and number of
reactors in operation
automatically adjusted to
minimize power
• Reactors EPA validated for AOP
• Typical application for seasonal
T&O control
-
PWN – Drinking Water
-
IPR vs. DESALINATION: SUSTAINABLE WATER REUSE
BENEFITS
• No brine discharge
• Lower energy costs
• Lower capital and operating costs
• WWTP is negative cash flow to municipalities
• Additional treatment converts wastewater to drinking water standards - Negative cash flow becomes a revenue/credit stream
• Wastewater is no longer entering the environment – reduction of contamination to other WTP, feminization of fish, male sperm counts in Great Lakes watershed
-
IPR CASE STUDIES
-
IPR INSTALLATION - ORANGE COUNTY, CALIFORNIA
-
IPR INSTALLATION - ORANGE COUNTY, CALIFORNIA
70 MGD (100 MGD peak) California facility treating wastewater to drinking water standards for groundwater replenishment
Water is injected (to protect from seawater) and percolated (to replenish) into the aquifer
MF/RO/UV-Oxidation treatment train (UV system uses monochromatic amalgam lamps)
Orange County’s Water Factory
21 pioneered the use of UV-
oxidation.
-
FULL-SCALE TESTING - ORANGE COUNTY, CA
0
10
20
30
40
50
60
70
80
1 2 3 4 5 6 7
Run #
[ND
MA
], p
pt
[NDMA], Inf
[NDMA], Eff
4 Reactors On
6 Reactors On
Flow: >8.5 MGD
-
DEMONSTRATION TESTING - ORANGE COUNTY, CA
Influent MS2Effluent MS2
0.000
1.000
2.000
3.000
4.000
5.000
6.000
Lo
g (
pfu
/mL
) M
S2
-
INSTALLATIONS AUSTRALIA
Severe drought – Country
wide
Lack of water supply planning
Driving a >AU$2 billion
investment in water projects
over the next 18 months
IPR, Conservation, Desal
Western Corridor Water
Recycling Projects (Brisbane)
– MF/RO/UV-oxidation
-
20 MLD Queensland, Aus facility
treating wastewater for addition to
local reservoirs
Water will be added to dams to
augment surface water supplies
MF/RO/UV-Oxidation treatment
train (UV system uses
monochromatic amalgam lamps)
The TrojanUVPhox™ at Bundamba 1A
IPR INSTALLATION – BUNDAMBA AWTP, BRISBANE, AUS
-
NDMA – MEASURED POST RO AT BUNDAMBA*
* Poussade, Y; A. Roux, T. Walker and V. Zavlanos. Advanced Oxidation for Indirect Potable Reuse – A
Practical Application in Australia. Presented at OzWater 2009.
-
NDMA – TREATED AT BUNDAMBA
* Poussade, Y; A. Roux, T. Walker and V. Zavlanos. Advanced Oxidation for Indirect Potable Reuse – A
Practical Application in Australia. Presented at OzWater 2009.
-
CONCLUSIONS
• Technical Conclusions
– Both MP and LPHO lamps effectively produce hydroxyl radicals
– LPHO lamps more efficient according to theory and practice
• Sustainability Conclusions
– IPR builds on existing WWT infrastructure converting a cost to revenue
– IPR less energy intensive than desalination
– No wastewater discharge to increasingly sensitive rivers and lakes
-
Questions?
Terry Keep
Sales Manager - ECT
TrojanUV
(519) 457-3400
www.trojanuv.com