Ozone Transfer Efficiency
Ozone transferred is difference between the amount fed (ozone feed) and the amount he leaves the system (ozone
out). Ozone transfer efficiency can be expressed as follows:
Transfer Efficiency (TE) ={(Ozone Feed) - (Ozone Out)}/(Ozone Feed)
The transfer efficiency is effected by various factors including bubble size, temperature, pressure, gas/liquid ratio,
concentration of ozone in the feed gas(related to ozone generator output), water chemistry, etc. The following
relationships between key variables and TE exist:
1. TE decreases as applied ozone dose increases.
2. TE increases as water quality decreases (ozone demand increases)
3. TE increases as the water chemistry favors the formation of hydroxyl radicals (high pH and low alkalinity)
4. TE decreases as gas/liquid ratio increases.
5. TE increases with decreasing bubble size.
6. TE increases with increasing concentration of ozone in the feed gas.
The design of the mixing/contact system are important for the TE. Different types of mixing systems have application
given site specific conditions and economics. In the case of fine bubble diffusers the flow pattern through the contact
vessel and the depth of the diffusers are critical to the TE. Beyond the normal factors effecting TE, the configuration of
the side stream injection system will have an impact on TE, e.g. removing gas immediately after the injector or in the
contact chamber.
Background
Ozone transferred is difference between the amount fed (ozone feed) and the amount he leaves the system (ozone
out). Ozone transfer efficiency can be expressed as follows:
Transfer Efficiency (TE) ={(Ozone Feed) - (Ozone Out)}/(Ozone Feed)
The transfer efficiency is effected by various factors including bubble size, temperature, pressure, gas/liquid ratio,
concentration of ozone in the feed gas(related to ozone generator output), water chemistry, etc. The following
relationships between key variables and TE exist:
1. TE decreases as applied ozone dose increases.
2. TE increases as water quality decreases (ozone demand increases)
3. TE increases as the water chemistry favors the formation of hydroxyl radicals (high pH and low alkalinity)
4. TE decreases as gas/liquid ratio increases.
5. TE increases with decreasing bubble size.
6. TE increases with increasing concentration of ozone in the feed gas.
The design of the mixing/contact system are important for the TE. Different types of mixing systems have application
given site specific conditions and economics. In the case of fine bubble diffusers the flow pattern through the contact
vessel and the depth of the diffusers are critical to the TE. Beyond the normal factors effecting TE, the configuration of
the side stream injection system will have an impact on TE, e.g. removing gas immediately after the injector or in the
contact chamber.
Background
- 1. Ozonation is an absorption process
2. Mass transfer rate dependent on
- Physical properties of phases
Concentrations at the interface
Degree of turbulence
- N = (kL x a) x (CL*-CL) x VL
CL* = f(CG, P, T) - Henry’s law
CL = f(mixing conditions)
kL.a = f(hydrodynamic & operating conditions, reactor configuration)
CL: Concentration of Ozone in Liquid
CG: Concentration of Ozone in Gas
Spartan Environmental Technologies
Air and Water Treatment
Air and Water Treatment
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Spartan Environmental
Technologies, L.L.C.
7383 Lauren J Dr
Mentor, OH 44060
USA
Phone: 800-492-1252
Fax: 440-368-3569
E-mail: info@
spartanwatertreatment.com
Technologies, L.L.C.
7383 Lauren J Dr
Mentor, OH 44060
USA
Phone: 800-492-1252
Fax: 440-368-3569
E-mail: info@
spartanwatertreatment.com
Ozone Water Treatment: Transfer Efficiency
