Author(s)

E. Christoffels & F. M. Mertens

Abstract

A study has been conducted on a retention soil filter (RSF) to test its effectiveness in removing pharmaceutical residues from combined sewer overflows (CSO). Efficient removal of solids, nutrients and heavy metals has already been proven by Frechen (Neue Erkenntnisse zur Mischwasserbehandlung in Retentionsbodenfiltern, 2012). The possibility that organic micropollutants are also retained by the use of retention soil filters has been identified, but data is lacking. Results obtained in this study, in which testing for removal by RSF of numerous micropollutant substances has been performed, are most promising. The pharmaceuticals diclofenac and ibuprofen are presented in detail as examples of such micropollutants. Both show a reduction in positive samples of more than 55% as well as a significant reduction in median and maximum concentrations. These results add to the evidence that using retention soil filters in the advanced treatment of wastewater from combined sewer overflows reduces the exposure of watercourses to pharmaceutical residues. Keywords: retention soil filter, combined sewer overflow, micropollutants, pharmaceuticals, diclofenac, ibuprofen.

Keywords

retention soil filter, combined sewer overflow, micropollutants, pharmaceuticals, diclofenac, ibuprofen.