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Introduction to Ozonation

Ozonation is the process of introducing ozone gas (O3) into a substance, typically water, in order to purify and disinfect it. Ozone is an unstable form of oxygen (O2) that has a powerful oxidizing effect, which makes it effective at destroying a wide range of pollutants and harmful microorganisms such as bacteria, viruses, and algae. In water treatment, ozonation is used as a replacement for chlorine and other chemical disinfectants, as ozone is an environmentally friendly and efficient alternative.

What is Ozone?

Ozone is a triatomic form of oxygen with the chemical formula O3. Its three oxygen atoms strongly influence its reactivity, the extra oxygen atom can easily attach to other substances. That means ozone is an unstable molecule that decomposes into oxygen molecules. So, It must be generated on-site as used. The Typical half-life of ozone gas at 20 C is 3 days and 20 minutes when ozone is dissolved in water.

ozone dipole

Ozone Generation

The industrial generation of ozone is typically done using a process in which high-voltage electrical energy is applied to an oxygen-rich gas mixture. It is simply a diffused spark through a dielectric to spread out the electrical discharge to a large area. In this method, the electric charge applied to the electrodes causes some of the oxygen molecules to split apart and temporarily combine with other oxygen molecules making a molecule of three oxygen atoms (O3).

How does Ozone work in water treatment?

The process of ozonation involves the introduction of ozone gas into the water being treated. This can be done by using a venturi injector to dissolve ozone directly into the water. Once the ozone is in the water, it begins to react with the contaminants and pollutants, breaking down their chemical structure and rendering them harmless. Ozone is a very strong oxidant and virucide and is widely used for drinking water disinfection. The effectiveness of a biocide in the ozonation system is normally described by its concentration-time or CT value which is defined as a product of the average concentration of ozone(residual ozone) multiplied by the exposure time

Chemical Properties of Ozone

  • Ozone is an excellent broad-spectrum oxidizing
  • Ozone is a strong chemical oxidant
  • Reduces the toxicity of organic compounds
  • can be combined with UV or Peroxide to generate hydroxyl radicals to create an advanced oxidation process

Ozone is a very strong oxidant and virucide and is widely used for disinfection, Ozone destroyed bacteria because it directs protoplasmatic oxidation resulting in cell wall disintegration.

The effectiveness of a biocide in the ozonation system is normally described by its concentration-time or CT value which is defined as a product of the average concentration of ozone( residual) multiplied by the exposure time

Ct values (min · mg/L) for 4-log inactivation of viruses

Inactivation byTemp 5ºCTemp 10ºCTemp 20ºCTemp 25ºC
Chlorine dioxide33.425.112.58.4

Ct values (min · mg/L) for 3-log inactivation of Giardia cysts

Inactivation byTemp 5ºCTemp 10ºCTemp 20ºCTemp 25ºC
Chlorine dioxide26231511

Source: Water and Wastewater Engineering: Design Principles and Practice, Mackenzie L.

For the table, we can see ozone has the lowest CT values which mean needs the least amount of exposure time or the least amount of biocides to inactivate virus or bacteria

Check this interesting article about ozone vs chlorine for water disinfection

Benefits of Ozonation for Water Purification

Ozonation is an efficient and effective way to purify water, and it offers a range of benefits over traditional methods such as chlorination. Here are some of the key benefits of ozonation for water purification:

  1. Powerful Disinfection: Ozone is a highly reactive oxidizing agent, which makes it effective at destroying a wide range of pathogens, including bacteria, viruses, and algae. It is also effective at destroying other harmful contaminants such as pesticides and organic matter.
  2. Safe and Environmentally Friendly: Unlike chemical disinfectants such as chlorine, ozone is not toxic to humans or the environment. Ozone breaks down into oxygen after use, leaving no harmful residuals in the water. This makes it a safer and more environmentally friendly alternative to traditional water purification methods.
  3. Faster and More Efficient: Ozonation is faster and more efficient than traditional methods of water purification, such as chlorination. In many cases, ozonation can be completed in a fraction of the time required for conventional methods, and it is often more effective at achieving desired levels of water purity.
  4. Improves Water Quality: Ozonation not only disinfects water but also improves the water’s overall quality. Ozone oxidizes and removes organic matter, improving the taste and odor of the water. It also helps to clarify the water by removing impurities, resulting in a clearer, more transparent appearance.
  5. Cost-Effective: While the initial investment for ozonation equipment may be higher than traditional water purification methods, the overall cost is often lower. This is because ozonation is faster and more efficient, reducing the amount of time and resources required for water treatment. In addition, the lack of toxic residuals means that there are no disposal costs associated with ozonation, making it a more cost-effective option in the long term.

Main components for an ozonation system

The Main Components of an ozone water treatment system are the feed gas source + ozone generator + ozone transfer system

water disinfection system

Feed Gas

Oxygen-feed ozone generators are the best choice for all industrial applications.

  • We recommended using PSA Oxygen concentrators to produce Ozone
  • oxygen concentrator produces oxygen with 90-95% of purity
  • Oxygen feed Ozone generator results in a concentration of 4-20 wt.%
  • Air feed Ozone generator results in a very lower concentration of 1-3 wt.% (not suitable for ozonation)

Air-feed generators are not suitable for most industrial applications. Remember that only 21% of air is oxygen this significantly affects the ozone concentration that a generator can achieve. In addition, inside the cells, the remaining 78% of the nitrogen will form nitric oxide deposits. In this way, ozone production will gradually decrease after a few months. lear more

Ozone Generators

Absolute Ozone® – ozone generators are equipped with a Dielectric Barrier Plasma Discharge cell. Air-colled Absolute Ozone® generators produce ozone at very high concentrations, typically in the range of 5 to 16 wt.%.

  • Low Oxygen Requirement 2-3 slpm for 1 ppd of ozone

  • High-Pressure Range 10-120 PSIG working pressure

  • PCOP System – Pressure Compensated Ozone Production System

  • Air Cooled, works well at up to +40C, no need to pay for water, water conditioning & air conditioning systems

  • No Maintenance, no serviceable parts, leakproof construction tested at up to 150 PSIG, reliable, less operating cost.

  • 5 Years Warranty & “Right on Spec” Performance Warranty, The only warranty that guarantees performance, in the ozone industry

Check this article to learn how to size an ozone generator

Ozone Mass Transfer

Ozone needs to be dissolved into water. The ozone gas is partially soluble in the liquid, the solubility efficiency depends on factors such as temperature pressure and concentration. However, using proper methods and equipment, high mass transfer efficiencies can be reached.

Venturi-based mass transfer systems are the preferred method for dissolving ozone in water due to their simplicity, economy, and effectiveness. Venturi injector has about 90% efficient and can be up to 99% efficient at dissolving ozone into the water.

The Power of Ozone in Destroying Organic Pollutants

There are several mechanisms by which ozone can degrade organic pollutants, including direct oxidation and indirect oxidation through the formation of hydroxyl radicals. In direct oxidation, ozone directly reacts with the pollutant molecule, breaking down the chemical bonds and resulting in the formation of smaller, less harmful compounds.

In indirect oxidation, ozone reacts with water to form hydroxyl radicals, which are highly reactive and attack organic pollutants. This reaction results in the degradation of the pollutant into smaller, less harmful compounds.

The rate at which organic pollutants are degraded with ozone is dependent on several factors, including the nature of the pollutant, the concentration of ozone, and the pH of the water. In general, ozone is most effective at degrading simple organic pollutants such as alcohols and aldehydes, while it is less effective at degrading more complex pollutants such as chlorinated compounds.

Ozone has been shown to be effective at removing a wide range of organic pollutants, including:

  1. Pesticides: Ozone has been shown to effectively degrade a wide range of pesticides, including organochlorine and organophosphate pesticides.
  2. Pharmaceuticals: Ozone has been shown to effectively remove pharmaceuticals from water, including antibiotics, hormones, and other drugs.
  3. Endocrine Disruptors: Ozone has been shown to effectively degrade endocrine disruptors, which are chemicals that can interfere with the endocrine system and cause negative health effects.
  4. Volatile Organic Compounds (VOCs): Ozone has been shown to effectively remove volatile organic compounds from water, including solvents and other industrial pollutants.

Contact Us  if you need more information about your ozonation process

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