When aircraft are de-iced
, waste water with varying concentrations of de-icing agents is produced. As is the case with all other waste water from the aprons, this water also flows via sewers with storage and overflow capacity into storm water sedimentation tanks (see Rainfall
) before being released into the Kittelbach river. Since the release of large amounts of de-icing agents into the Kittelbach is not permitted, in the winter months the waste water is analysed against the Total Organic Carbon
(TOC) chemical parameters. The TOC content is continuously measured online at all sedimentation tanks. If the safety limit of 40 mg/l is exceeded, the waste water is automatically released not into the Kittelbach, but into the municipal foul water sewerage network.