SchussenAktivplus

Downstream treatment of wastewater (oxidative and adsorptive) in the Unteres Schussental valley and rainwater treatment with secondary treatment in the retention soil filter of the city of Tettnang

a) In the sewage treatment plant Eriskirch of the wastewater association (AV) Unteres Schussental valley a wastewater sub-stream is mixed with ozone prior to rapid sand filtration. The ozones oxidative effect in combination with the filtration is examined. Filtered sewage is then guided over adsorbing material (fixed-bed filter) filled with granular activated carbon. It might thus be possible to achieve optimal removal of microcontaminants and pathogens by the combination of oxidation and adsorption.

b) When any further demands are put on the reduction of the introduced contamination load from a mixed sewage system during rainfall events, a retention soil filter will be installed downstream the rainwater overflow basin in most cases. However, retention soil filters require a relatively large area and are hence usually restricted to rural communities. The impact of such filter systems on microcontaminants and pathogens is largely unknown. A retention soil filter of the city of Tettnang offers excellent conditions for related studies.

Aim

a) The removal efficiency of microcontaminants and pathogens by combination of oxidation, filtration and adsorption in the sewage treatment plant Eriskirch of the AV Unteres Schussental valley will be examined.

b) The impact of a retention soil filter on microcontaminants and pathogens will be examined for the city of Tettnang in an exemplary fashion.

Key areas of activity

» sewage treatment plant Eriskirch / AV Unteres Schussental

• oxidative effect of ozone combined with filtration

• adsorptive effect of granular activated carbon after ozonization and filtration

» retention soil filter / City of Tettnang

• impact of a retention soil filter downstream of a rainwater overflow basin

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