How does Ozone work in Wastewater Treatment?

The wastewater treatment process requires a potent agent. In this article you’ll see how Ozone can treat even wastewater, eliminating virus, bacteria, protozoa and many other microorganisms, reducing the use of chemicals, and leaving the process more environmentally friendly.

And how can Ozone act in the wastewater treatment system? Learn as you read below!

In the last 20 years, humans are more exposed to wastewater discharged into the environment.

Ozonization is an emerging technology for disinfection and removing of micropollutants present in the wastewater.

Because ozone is a highly disinfecting and oxidizing agent, many municipalities and industries prefer this advantage technology to treat wastewater.

The application of ozone in the wastewater became more and more popular because it is a reliable process.

How does it work?

The primary mechanism for the destruction of pathogenic organisms to prevent the spread of waterborne diseases is disinfection and ozone is considered, for many studies, the most powerful disinfecting and oxidizing agent.

Ozone is a powerful oxidant and is capable of oxidative degradation of many organic and inorganic compounds. Ozonation degrades efficiently most of the micropollutants present in the wastewater.

Ozone is soluble in water and it decomposes to oxygen, leaves no residual harmful product, no sludge disposal problem and increases the dissolved oxygen (DO) content of wastewater, which helps further in the degradation of residual pollutant.

It is a powerful disinfectant, too. Ozone does not produce any secondary pollutants as compared to chlorine which produces THM, chloramines that are carcinogenic in nature.

A faster ozone reaction means shorter contact time. The reactions with viruses are rapid and there is no risk and toxicity and odor problems.

Ozone is effective 25 times more than hypochlorous acid, 2500 times more than hypochlorite and 5,000 times more than chloramines. All these excellent properties have made ozonization more and more applicative in different fields of wastewater and drinking water treatment.

Ozonation, which is utilized in advanced treatment of secondary wastewater effluent and has shown potential as a means of peroxidising and disinfecting primary wastewater effluents, appears promising in this regard. Recent studies have shown that relatively low ozone (O3) doses (e5 mg/L) can yield >90% depletion of many antibacterial compounds in wastewaters.

Ozone eliminates the following microorganisms that are present in wastewater:




Escherichia coli (enterotoxigenic)


Leptospira (spp.)


Salmonella typhi

Typhoid fever

Salmonella (2,100 serotypes)


Shigella(4 spp.)

Shigellosis (bacillary dysentery)

Vibrio cholerae



Balantidium coli


Cryptospodidium parvum


Entamoeba histolytica

Amebiasis (amoebic dysentery)

Giardia lamblia elminths


Ascaris lumbricoides




Trichuris trichiura



Enteroviruses (72 types, e.g., polio, echo and coxsackie viruses)

Gastroenteritis, heart anomalies, meningitis

Hepatitis A Virus

Infectious hepatitis

Norwalk Agent




Ozone use

Ozone is used to treat a wide variety of wastewater including:

  • Municipals

  • Paper industries

  • Textile industries

  • Meat processing

  • Animal waste treatment

  • Septic

  • Cutting fluids recycling

  • Chicken egg processing effluent

  • Laundry water recycling

Ozone is increasingly used, in combination with other treatments, for eliminating all traces of harmful substances. The advantage here is that ozone treatment does not require the use of additive products, which may prove toxic.

To apply conventional purification techniques first and follow up with ozonation as a second stage, it is advised by many researchers. Thus, ozone is increasingly used as final treatment stage for eliminating all traces of harmful substances.

The effectiveness of disinfection depends on the susceptibility of the target organisms, the contact time, and the concentration of ozone.

All its properties have made ozone as an ultimate treatment for all types of wastewater treatment.


  • Ozone is an effective disinfectant and kills bacteria and virus;

  • There are no harmful residuals that need to be removed after ozone treatment because it decomposes rapidly;

  • Ozone acts as an effective deodorizer and will remove unpleasant or chemicals odors from treated water;

  • After ozonization, there is no regrowth of microorganisms;

  • Ozone eliminates heavy metals from wastewater;

  • Ozone eliminates phenols (coking plant, oil refineries, petrochemical plant, mines, chemical and pharmaceutical process lines, foodstuff, …).

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