Name

Ozonation of treated wastewater for removal of organic micropollutants - advantages and limitations of peroxide addition

Speakers

Dr Uwe Hübner

Authors

Uwe Hübner, Arne Wieland and Achim Ried, Xylem Water Solutions, Germany

Description

Ozone is well known as an effective disinfectant and oxidant and has been operated for drinking water treatment in combination with biologically active filtration (BAF) for more than 50 years. More recent, this combination is frequently applied for the removal of organic micropollutants from treated wastewater. The combination of ozone with hydrogen peroxide (H2O2) is a well established advanced oxidation process for clean water applications. However, ozonation of treated wastewater is characterized by a much faster ozone decay and already substantial formation of radicals from the reaction of ozone with the water matrix. Lessons learned from drinking water applications can therefore not easily be translated to wastewater ozonation. 

This presentation will discuss the potential of H2O2 addition during ozonation of treated wastewater with respect to four major questions: 

 - Can addition of H2O2 substantially improve radical generation during ozonation? 
-  Which H2O2 doses are needed to effectively mitigate bromate formation? 
-  Does H2O2 affect disinfection performance during ozonation? 
-  How should reactor designs be adjusted compared to single ozonation? 

We will present bench-scale and pilot-scale results on radical oxidation and bromate mitigation during ozonation of secondary effluents and outline new reactor and control concepts for ozone-based advanced oxidation.

Time

3:08 PM - 3:20 PM

Location Name

Room 3

Track

10:05 - 16:15 Micropollutants & Emerging Contaminants