DEMO3 Phase II – Ozonation of Waste Water at the Aachen-Soers Waste Water Treatment Plant

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DemO3A, the "Demonstration Project Ozonation of Waste Water at the Aachen-Soers Waste Water Treatment Plant", is a research project led by the Eifel-Rur Water Association, WVER for the short. In Phase II of the project, the operation of the large-scale ozone facility at the Aachen-Soers sewage treatment plant will be intensively monitored. The wastewater ozonation process serves as the 4th purification stage for the removal of trace elements (drug residues, care products, industrial chemicals) from the wastewater.

The large-scale ozone plant is designed for the treatment of the entire wastewater volume of the Aachen-Soers wastewater treatment plant. This is 1,200 l/s in dry weather and 3,000 l/s in rainy weather. In the two chambers of the contact reactor, the ozone is bubbled into the wastewater via 112 diffusers. The resulting residence time is at least 12 minutes. After ozonation, the wastewater is post-treated using clear water nitrification and sand filtration.

The ozone plant was constructed on the basis of the design recommendations for the pilot scale plant determined in Phase I of the project, which was completed in 2017. In addition to the operation of the pilot scale equipment, the actual state of the Aachen-Soers wastewater treatment plant and the river Wurm (receiving water) without an ozone plant was investigated and documented with regard to the emission of trace substances.

These investigations serve as a reference condition and will now be repeated after commissioning of the large-scale ozone plant in order to detect changes. With the help of these investigations the two main questions of the project phase II are to be answered:

1. what effects does the operation of the ozone system have on the Wurm river (receiving waters)?
2. what operating settings allow the ozone system to operate efficiently?

The conventional wastewater treatment plant Aachen-Soers shows a very good cleaning performance with regard to the elimination of organic substances as well as various nutrients and the retention of particulate substances.

The elimination of trace substances took place insufficiently before the commissioning of the large-scale ozone plant. Pharmaceuticals in particular pose a problem, as their concentration in the Wurm is significantly higher after discharge than in the watercourse above the wastewater treatment plant. Antibiotic resistances and multiple resistances were also detected.

The investigations in Phase II are now intended to clarify the extent to which ozonation has an effect on the concentrations of pharmaceuticals in the water and on the resistances. The investigations at the pilot scale plant already showed that trace substances could be reduced on average by 80-90% and the bacterial count by 1.5 to 2 log stages.

Estrogenic potential is almost completely eliminated after ozonation. Whether the transformation products generated by ozonation will have an effect on the Wurm will also be investigated in Phase II.

Overall, during the project, a large number of (waste) water samples will be taken in the water body and at the wastewater treatment plant, and these will be examined for various parameters in order to be able to clarify, by 2020, the extent to which wastewater zoning affects the downstream water body and under which conditions the wastewater zoning can be operated as efficiently as possible.

 

Information about Research Project „DemO3AC Phase II“

Funding agency:
The Ministry for Environment, Agriculture, Conservation and Consumer Protection of the State of North Rhine-Westphalia

Duration:
01.01.2018 – 31.12.2019

Project Manager:
Vera Kohlgrüber, M. Sc.

Project Partner:
Wasserverband Eifel-Rur
Institut für Umweltforschung (IfU)
Institut für Angewandte Mikrobiologie (iAMB)
Forschungsinstitut für Ökosystemanalyse und -bewertung (gaiac)

 

Information about Research Project DemO3AC Phase II

Funding agency

The Ministry for Environment, Agriculture, Conservation and Consumer Protection of the State of North Rhine-Westphalia

Duration

January 1, 2018 to December 31, 2019

Project Manager

Vera Kohlgrüber, M. Sc.

Project Partner

Wasserverband Eifel-Rur
Institut für Umweltforschung (IfU)
Institut für Angewandte Mikrobiologie (iAMB)
Forschungsinstitut für Ökosystemanalyse und -bewertung (gaiac)