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Using U V Energy

RESIDUAL DISSOLVED OZONE DESTRUCTION

- Index

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• What is UV Radiation

• How It Works for Ozone Destruction

• What is UV Dose

• How To Size UV System

• What are the Components of UV System

• Process Flow Diagram

• Models Of UV System

• References

- What is UV radiation?

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• UV stands for Ultraviolet

• UV is invisible spectrum of light

• UV has three sub category - UV – A ; UV – B ; UV – C• UV – C has 253.7 nm peak wavelength• UV – C is also called as Germicidal • UV – C has major three Properties

– Germicidal | Ozone Destruction | Advance Oxidation Process [AOP]

- How it Works for Ozone Destruction?

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• Ozone is a tri atomic compound of Oxygen “O” • The two atomic compound is Oxygen “O₂”• This form of Oxygen “O₂” is very stable• Ozone is “O₃” & one “O” is very unstable.• UV – C has an energy.• When UV-C falls on “O₃” the unstable “O” is very easily be separated,

breaking the inter molecular bond• This “O” combines with another free “O” and becomes stable “O₂” • This is the way “O₃” in the water is destructed [converted] from “O₃” to

“O₂”.

- What is UV Dose?

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• UV dose is a Product of UV intensity at 253.7 nm & Contact time [Exposure Time].

• UV Dose = UV Intensity X Contact Time [ µW/cm² X Sec. ]

• Measured in “ Microwatts-Seconds per Cm²” [µW-S/cm²] or J/m² or mJ/cm²

• Example = 100 J/m² = 10 mJ/cm² = 10 mW-S/cm² = 10,000 µW-S/cm²

- How to Size UV for Ozone Destruction?

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• There are three factors to size/design UV System

– 1. UV Dose 2. % UVT 3. Ozone Concentration

• 1. UV Dose is intensity of UV light & contact time

• 2. % UVT is the % of UV light penetrating water medium, at given distance.

• 3. Ozone concentration is the residual un-dissolved Ozone in the medium [water]

- Components Of UV System

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• UV Reactor – SS 316 – Sea Water & Ozone Compatible

• UV Driver / Ballast – Electronics

• High % UVT isolator – Quarts Jacket

• Rubber Seals & O-rings – Sea water + UV Radiation + Ozone Compatible

- Process Flow Diagram

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Ozonated Water Storage Tank

Ozone Destruct UV

Feed Water Pump

Ozone Free Water

ToCulture Tank

ORP SensorCirculation Loop

Single Pass

- Model Selection – Example 1 – 300 W UV Lamp

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Std. UV Lamp Intensity : 9.0 mW/cm² @ 55.0 mm of 300 W High Intensity Amalgam Lamp

UV Reactor Volume : 30 – 32 L

% UVT : 80 %

Ozone Concentration : 0.4 ppm [G/m³]

Ozone Destruct UV Dose : 120 mW-S/cm² [min.]

Contact Time : 120 mW-S/cm² / 9.0 mW/cm² = 13.3 Sec.

Peak Ozonated [0.4 ppm] : Reactor Volume [L] / Contact Time [Sec.]water Flow Rate = 30 L / 13.3 Sec. = 2.25 LPS = 8.1 m³/hr

(300 w UV Lamp)

- Model Selection – Cont... Example 2 - 120 W UV Lamp

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Std. UV Lamp Intensity : 3.0 mW/cm² @ 50.0 mm of 120 W UV Lamp

UV Reactor Volume : 20 – 22 L

% UVT : 80 %

Ozone Concentration : 0.4 ppm [G/m³]

Ozone Destruct UV Dose : 120 mW-S/cm² [min.]

Contact Time : 120 mW-S/cm² / 3.0 mW/cm² = 40.0 Sec.

Peak Ozonated [0.4 ppm] : Reactor Volume [L] / Contact Time [Sec.]water Flow Rate = 20 L / 40.0 Sec. = 0.5 LPS = 1.8 m³/hr

(120 w UV Lamp)

- Model Selection – Cont... Example 3 – 80 W UV Lamp

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Std. UV Lamp Intensity : 2.0 mW/cm² @ 40.0 mm of 80 W UV Lamp

UV Reactor Volume : 15 – 18 L

% UVT : 80 %

Ozone Concentration : 0.4 ppm [G/m³]

Ozone Destruct UV Dose : 120 mW-S/cm² [min.]

Contact Time : 120 mW-S/cm² / 2.0 mW/cm² = 60.0 Sec.

Peak Ozonated [0.4 ppm] : Reactor Volume [L] / Contact Time [Sec.]water Flow Rate = 15 L / 60.0 Sec. = 0.25 LPS = 0.9 m³/hr

(80 w UV Lamp)

- References

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1. http://www.spartanwatertreatment.com/UV-ozone-destruction.html

2. http://www.aquafineuv.com/UVTechnology/Applications/OzoneDestruction.aspx

3. http://www.ozonia.com/media/pdf/app/pure_water-e.pdf

4. http://www.wcponline.com/pdf/0804%20Electrolytic%20Ozone%20Generation.pdf

Thank You

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Solution Engineer : Mr. Sunil ShahContact : +91-93212 34527

Mail ID : sunilshah@chemtronicsindia.comURL : www.chemtronicsindia.comwww.ozonegeneratorindia.comwww.m.chemtronicsindia.com