The use of ozone for wastewater disinfection has been growing in popularity due to strict regulations on fecal coliform and other pathogens. As chemical costs rise, ozone becomes a more cost effective solution for wastewater disinfection. Ozone can be produced on site using oxygen from the ambient air. Only electrical power is required for operation.
When discharge limits on pathogens are lowered, the natural solution is to add additional chemicals to meet these new limits. Adding more chemicals to a wastewater stream effluent for disinfection may seem like an easy solution at first; however, in many cases these chemicals must then be removed from the effluent wastewater prior to discharge due to limits on these chemicals. For example, if chlorine is used for the reduction of E.coli the chlorine must be removed using de-chlorination prior to wastewater discharge. If 20% more chlorine is required to meet the new wastewater discharge limits, 20% de-chlorination must also be applied to this water. Over time, these costs can really add up.
Ozone's reactive properties allow it to quickly kill bacteria. In fact, ozone is ten times stronger than chlorine as a disinfectant.
Ozone is a green solution to wastewater disinfection. Ozone is produced on site and is all natural, formed from only oxygen. No by-products or waste products are formed in the creation of ozone.
|Action in Water||Chlorine||Ozone|
|Oxidation Potential (Volts)||1.36||2.07|
|Water Half-Life||2-3 Hours||20 Minutes|
|Monthly Use Cost||Moderate-High||Low|
Using ozone for wastewater disinfection offers many advantages in cost savings, space savings, labor savings, and cleaner water. More and more wastewater plants are making the switch to ozone use to capitalize on these advantages.
Ozone is an effective disinfectant for many varieties of pathogens.
The use of ozone in wastewater disinfection has gained popularity in recent years due to the secondary effects that ozone may offer in some applications. These secondary benefits have helped make ozone a cost effective alternative, and a necessary alternative in some applications.
Information about Ozone Disinfection and Contact Time Kinetics
Ozone used for wastewater disinfection became popular early on when the widespread use of ozone gained popularity in the 1970's and 1980's. Due to lack of equipment reliability and rising costs, the use of ozone almost completely disappeared from this application. In recent years however, ozone is getting another chance in many locations across the USA and Europe. This is partly due to improvement in equipment reliability and lower cost; however, the main reason for this revival is the secondary benefits that ozone offers along with the increased costs of chemicals creating an economic advantage. See the timeline.
Last Updated: May 29, 2013