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Techniques Of Ozonation Of Water

Methods Of Ozone Dissolution In Water

Mixing of Ozone with water is generally termed as Ozone contacting. Although the solubility of Ozone is better than Oxygen in the water, being gas to liquid contact, dissolution of Ozone in water is critical. Thus the design of an efficient Ozonation system needs careful evaluation. The advantages, disadvantages and limitations of Ozone contact methods used in practice are provided in the technical note.

Ozonation by Diffusion method

The Ozone can be diffused or bubbled in a tank filled with water. A diffuser or the diffuser network is located at the bottom of the tank from which the Ozone gas is bubbled in the water. The Ozonation tank should not be under pressure otherwise the flow of Ozone can be adversely affected. The height of water column in the tank also important for proper absorption of Ozone. The diameter of tank should be less and height more (A ratio of Diameter & Height, 1:3 should be considered).

The Ozone pipeline from the output of the Ozone Generator is connected to the diffuser or the network in the tank. The Ozone feeding pipe is to be raised at least by three to four feet above tank level to ensure that the water does not return to Ozone Generator from the Contact Tank.

Online Ventury Injection system

The Ozone can be diffused or bubbled in a tank filled with water. A diffuser or the diffuser network is located at the bottom of the tank from which the Ozone gas is bubbled in the water. The Ozonation tank should not be under pressure otherwise the flow of Ozone can be adversely affected. The height of water column in the tank also important for proper absorption of Ozone. The diameter of tank should be less and height more (A ratio of Diameter & Height, 1:3 should be considered).

The Ozone pipeline from the output of the Ozone Generator is connected to the diffuser or the network in the tank. The Ozone feeding pipe is to be raised at least by three to four feet above tank level to ensure that the water does not return to Ozone Generator from the Contact Tank.

Ozone Injection by Recirculation Method

A Ozonation tank is used for consistent Ozone dissolution. The product water enters in from the topside to provide a counter-current flow of Ozone and water. The Ozonated water from this tank is utilized for the process. A separate line is used for the Ozone mixing and consists of booster pump, ventury injector, static mixer, pipeline and a central diffuser. Thus the Ozone mixing is independent of the filling speed, flow rate and the line pressure. The MOC of the system should be SS 316.

Layout for Automatic Ozonation System

Comparision Of Ozonation Systems

Ozonation Parameters	Diffusion In A Tank	On Line Injection	Recirculation Tank
Ozonation System	Ozone Diffused in the Bottom of the reaction tank	Ozone injected through Online Ventury Injection System in filling line	Ozone is injected in a re- circulation line by Ventury Injector and the Ozone Solution is Diffused in the Ozonation Tank
Ozonation Method	By Diffusion	Ventury Injection	Ventury Injection & diffusion combination
Ozone Contact Duration	Can be Controlled	Not under Control	Fully Controllable
Dissolution Efficiency	Low and depends on Water depth in the diffusion Tank	High and depends on the continuity of the production process	Very high & consistent, does not depend on operating parameters
Ozone & Water Flow	Counter Current	Counter Current	Counter Current in recirculation Line & Counter Current in Diffusion.
Dissolution Continuity Continuous	Dissolution Continuous Even when filling is not in operation	Dissolution Stops When ever filling is not operating	Dissolution Even when filling is not in operation
Ozone Utilization	Low (30 - 50% )	Medium (40 - 60% )	High ( 65 - 95%)
Dependency of Ozonation	Water Depth Ozone Pressure	Water Flow Rate Differ, Pressure across Ventury	Independent of : Water Flow Rate Line Pressure Ozone Pressure Filling yes or no
Qty of Ozone Injection	By Ozone Pressure	Not Under Control	By Ozone Pressure
Dissolution Consistency	Consistent Ozone Dissolution is Possible	Consistent Ozone Dissolution is not possible	Very Consistent Ozone Dissolution can be achieved
Product Quality	Reasonable	Inconsistent	Consistent Quality
System Components	Ozone Pipe	Ozone Pipe	SS Ozonation Tank
		Ozone Pipe	Recirculation Pump
		Ventury & NRV	Ventury & NRV
	Diffusers	Ventury & NRV	Static Mixer
		Flow Control Valve	Radial Diffuser
		Flow Control Valve	Central Diffuser
Ozone sensing and Controlling System	Possible	Not Possible	Possible & Generally part of the System
Ozonation System Cost	Low	Medium	High

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