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Ozone Applications In Sewage Treatment Plants


Ozone used for wastewater disinfection became popular after its widespread use in the 1970s and 1980s. The reason why it is popular; it is due to improved equipment reliability and low cost; However, the main reason for the increase in the use of ozone in the sector is the economic benefits offered by ozone, as well as the increased secondary benefits that create an economic advantage.

Among the secondary benefits of ozone; colour removal in wastewater, odour control, removal of micropollutants and reduction of total suspended solids (TSS).

The use of ozone for wastewater disinfection is gaining popularity due to strict regulations on fecal coliform and other pathogens. As chemical costs increase, ozone becomes a more cost-effective solution for wastewater disinfection. Ozone can be produced on-site using oxygen in the ambient air. Only electrical power is required for the process.

When discharge limits on pathogens are reduced, the natural solution is to add additional chemicals to meet these new limits. Adding more chemicals to the wastewater stream for disinfection may seem an easy solution at first; However, in most cases, these chemicals must be removed from the waste water prior to discharge due to limitations on these chemicals.

For example, if chlorine is used to reduce E.coli, chlorine is required from chlorine before the discharge of wastewater. If 20% more chlorine is required to meet the new wastewater discharge limits, 20% de-chlorination should be applied to this water. This application increases the costs very much over time.

Ozone is a green solution for wastewater disinfection. Ozone is produced on-site and is completely natural, it consists only of oxygen. No by-products or waste products are formed in the formation of ozone.

– The use of ozone eliminates the need to move chemicals into the field.
– With the use of ozone, the need to store chemicals is eliminated.
– After ozone dissolves in water, it does not leave residue in water; it returns to its original form, oxygen.

Oxidation Potential (Volts) 1,36 2,07
Disinfection of Bacterias Moderate Perfect
Disinfection of Viruses Moderate Perfect
Eco Friendly No Yes
Colour Removal Moderate Perfect
Carcinogen formation Possible Not Possible
Organic Oxidation No Moderate
Micro Clumping No Moderate
Ph effect Variable Low
Half-life 2-3 Hours 20 Minutes
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How Does UV work?

UV Spectrum


UV sterilization is to destroy and change the DNA structure of microorganisms through UV radiation. Virus or Bacteria will die immediately or can not reproduce the offspring so as to achieve the purpose of sterilization. UV-C light is with bactericidal effect because C wavelength UV light can be easily absorbed bu organisms DNA. 253.7nm wavelength UV light is the best.

Our UV products adopt a new generation of UVCPTM (Ultraviolet C Purification) technology to sterilize airflow in air duct. Our products use high quality, long life and high-intensity UVC lamps. Our Lamp Life is >9000 hours. UVC output is stable about 95% of UV energy output is with 23.7nm wavelength, which can effectively kill all kinds of pathogenic microorganisms.





  • UVC radiation has been proven to be effective against waterborne pathogenic microorganisms including those responsible for cholera, hepatitis, polio, typhoid, giardia, cryptosporidium and many other bacterial, viral and parasitic diseases
  • UVC radiation can be used to destroy chemical contaminants such as pesticides, hormones and other pharmaceuticals in drinking water or wastewater
  • UVC installations have low capital and operation cost
  • UVC technology is environmentally friendly
  • UVC installations are easy to operate and to maintain
  • UVC radiation has no harmful effect when overdosed
  • UVC radiation works instantly and the effectiveness does not depend on the water temperature
  • UVC disinfection is a physical process: no substances are added to the water
  • UVC disinfection is complementary to Chlorine disinfection: it deactivates organisms that are resistant to Chlorine such as giardia and cryptosporidium
  • UVC lamps can be easily regulated to optimise treatment for variations of water quality and for changing water flows
  • UVC radiation will keep the surface of reservoirs clean from biofilm
  • The UVC disinfection effect is directly related to the UV dose (which is the product of intensity and exposure time of the micro-organisms) so it’s effectiveness can be simply measured once the system design is validated