Ozone in Urban WWTP
Ozone in Waste Water Treatment Station
Use of Ozone in Urban WWTP
Ozone is a well-established technology in urban WWTPs. There are four main stages of application:
1. Pre-oxidation of the flow before the biological stage, to improve the COD/BOD ratio.
2. Recirculated Sludge Treatment, to improve the sludge volumetric index.
3. Tertiary Treatment, for disinfection and reuse.
4. Quaternary Treatment, for the removal of emerging contaminants.
The powerful oxidation capacity of ozone makes it an excellent tool for any of these stages, as it directly benefits COD, BOD, SS, SD, turbidity, color, odor, emerging contamination, and of course microbiology.
Ozone is a simple and safe technique that achieves the most demanding results.
ZonoSistem advises detailed engineering for project drafting, as well as designing and manufacturing ozone generators for real projects.
IImprove the discharge parameters of your WWTP
and promotes the reuse of water
Avoid the use of chlorine and packaged chemicals
Ozone is generated on-site, it does not need to store or transport chemicals
Ozone leaves no residues, is environmentally friendly, and reduces the carbon footprint.
The system is automated, you do not need manpower to apply it.
Do you want to improve the performance of your Urban WWTP?
Ozone Phases in WWTP
.jpg)
Pre-oxidation of the flow before the biological stage
The application of ozone before the biological reactor improves its performance.
Ozone oxidizes detergents, polyphenols, and other compounds that affect the COD/BOD ratio. Additionally, O₃ increases the dissolved oxygen rate.
Recirculating Sludge Treatment
The application of ozone improves the sludge volume index, reducing Escherichia coli, suspended solids in the decanted effluent, volatile matter in mixed liquor, and generally reducing sludge and its management.
Tertiary and Quaternary Treatment
The application of ozone in Tertiary Treatment aims at disinfection and water reuse. On the other hand, ozone in Quaternary Treatment has the ability to eliminate emerging contaminants.
Advantages of Treating WWTP with Ozone
Without labor, automatic
The system generates ozone and injects it into the tank automatically, without the need to apply manual labor in the process. The equipment only needs to be connected to the tank to be treated and provide it with a point of light.
No chemical storage
Ozone cannot be transported or stored, it is generated on site, and it is applied instantly, so it is not necessary to store and manage chemical products, it avoids transport and reduces the carbon footprint.
Biocide recognized by the ECHA
Ozone is on the list of biocides by the European Chemical Agency and ZonoSistem has all the necessary legalization documentation to be able to apply ozone in its process.
Ranges of Ozone Generators Available for WWTPs
1. What is the difference between the ranges?
The GR and GRV ozone generator ranges are designed to be powered with LOX oxygen. They are industrial-grade, robust units with high ozone concentration, designed and manufactured with care to operate 24/7. The GR range covers up to 1 kg O₃/h, featuring ceramic dielectric technology, while the GRV range is intended for higher production, up to 40 kg O₃/h.
On the other hand, the GRZO range differs from the other two because it comes with an integrated compressor and oxygen concentrator, so it doesn't require LOX oxygen. It is an autonomous unit that only needs electricity. It is also an industrial-grade system with high performance and efficiency.
2. Which range do you recommend?
The first thing is to calculate the amount of ozone you need. If you need more than 1Kg or 3/h, you will have to select the GRV range. For productions less than 1KgO3/h, you have the GRZO version, with compressor and oxygen concentrator, and if you prefer to work with LOX oxygen supply, you have the GR range. I recommend using the GRZO range whenever possible, it is a bit more expensive but you avoid the costs of LOX oxygen.
3. How much ozone do I need?
Generally, doses between 2 and 3 ppm of ozone are applied to the total flow of the plant.
Example of Ozone Installations in WWTPs
WWTP in Saudi Arabia.
Urban WWTP in Morocco.
WWTP Pre-oxidation in Tenerife.
Tertiary WWTP in Manacor.
WWTP Pre-oxidation in the Valencian Community.
Intermediate Sludge Treatment.