Using Ozone treatment to reduce COD levels

Question

What are the pros and cons of using Ozone treatment to reduce waste water COD levels prior to introduction into a Waste Water Treatment Plant?
We are looking to reduce the COD levels of grease trap waste following solids and FOG separation and removal.
We would like to investigate using Ozone to eliminate microbes and bacteria present in the waste water prior to release into the works. This would allow the microbes in the works to start work digesting the residual organic matter. Although most large matter has been screened prior to release.
Alternatively we have looked at dosing the wastewater with microbes prior to release into the works. However there are concerns that over time, the microbes we introduce will take over the waste water treatment works microbes and throw the system out.
If anyone has any experience in this we would greatly appreciate their advice.
Sincerely
Chris

Lin JYH-YAN · Answer

You should check the process of your wastewater treatment plant, and decide  the role and feature of ozone unit.

Lewis Titus · Answer

The TITUS Twister mixing aerator with ozone enhancement is specifically designed to deliver ozone into the water column. We can show you how to significantly reduce CBOD, FOG, Disolved sulfides, H2S gasses, and most of all odors without chemicals. Using only O2, and O3 generated on site, and delivered into the water column with our TITUS TWISTER mixing aerator. The TWISTER with ozone is also very effective at disinfection making water safe for re-use. You can contact me at lewis@titusig.com or go to our web site www.titusig.com

Waymon Hofheins · Answer

Why do you want to eliminate the bacteria?  The bacteria will eliminate the oil and grease, in time. The COD can be lowered with microbes.  We grow them for this use.  A grease separation through flotation and skimming would allow the recovered grease to be sold, if you have a large amount.  Many of the large food processing, and meat processing plants use this method.  Depends on the oil and grease, how you set it up.  I did a steel mill by using both precipitation of heavy tars, and flotation of the light oils.  Both were recovered.  I would have to know more about what else is there and what the full system is about before thinking about using ozone or a halogen: from what you have said, it may not be needed.  
Problems with Oil and grease have sometimes been solved with pH reversal, take it down and then bring it back up.  A high pH in the alkaline range will turn the oil into a soap. 
More needs to be known.  It sounds like a salesman just wanted to sell Ozone. You need to get some specifics.  Type of oil, or oils, grease from what?  what is causing the high COD, besides oil, full water analysis including metals, pH, hardnes (total, Ca, Mg), conductance UMOS, etc.   
Flow rates, and amount of flow, changes in flow, sessional flow, etc. if important.
I hope that helps.

Jim Patterson · Answer

We can create Ozone, Chlorine, Bromide, HCL, ClO2, 45 families of oxidants & 400+ chemical raeactions to disinfect any water contaminants & kill bacteria & their food sources with Electro-Oxidation. Large capacity units up to 1M gallons per day each
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Patrice ORLEACH · Answer

Chris, 
I will contact you on Monday to discuss the matter. We have running a pilot in Trinidad to lower the COD from produced oil. We have had a pilot in Paris for a year (now going to full implementation) for FOG elimination win sewerage (without ozone there). Ozone is indeed expensive but can only be a part of the solution. Creating emulsions for bacteria to eat the FOG with ozone as a supplement is the solution for most problem. Talk to you Monday. 
Patrice

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