Ozone Applications In Sewage Treatment Plants


Ozone used for sewage 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 faecal 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 wastewater 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)1,362,07
Disinfection of BacteriasModeratePerfect
Disinfection of VirusesModeratePerfect
Eco FriendlyNoYes
Colour RemovalModeratePerfect
Carcinogen formationPossibleNot Possible
Organic OxidationNoModerate
Micro ClumpingNoModerate
Ph effectVariableLow
Half-life2-3 Hours20 Minutes

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