Présentations Colloques

    Session 6.02: Treated WasteWater REUSE for groundwater recharge: addressing the challenge
    Rozman (orateur)
    Pharmaceuticals in wastewater and its interaction with groundwater- a case study of wastewater infiltration locality in Czech Republic
    Micropollutants in the environment are becoming a topical water management issue. Some pharmaceuticals are not effectively eliminated in most of current wastewater treatment plants. This specific type of pollution is therefore transferred from wastewater to surface water and successively to groundwater. Their effect on environment and human health is still uncertain, but we can expect more and more calls for concentration limits and standards for such substances in coming decades. Better understanding of occurrence and behavior of emerging pollutants like pharmaceuticals is our priority issue. **The purpose of our study is to evaluate the removal of pharmaceuticals in conventional wastewater treatment plants in Czech Republic and describe the occurrence and fate of pharmaceuticals on locality with infiltration of treated wastewater. Our complex monitoring system provides samples of wastewater, infiltrating surface water, infiltration ponds sediments and groundwater in different distances from source of pollution. The samples are analyzed for a range of 32 pharmaceuticals. The results reveal that wastewater treatment plants remove some of the analytes very efficiently (e.g. Paracetamol, Ibuprofen, Atenolol) while other pass the facility to a considerable extent (e.g. Carbamezepin, Diclofenac, Hydrochlorothiazide). The efficiency of different wastewater treatment plants is very variable. The samples of sediments confirm high sorption rate of most pharmaceuticals. After infiltration the concentrations of majority of detected micropolutants in groundwater gradually decrease, but species like e.g. Carbamezepin seem to be very persistent and decrease only due to dilution of infiltrated water.**We can conclude that current wastewater treatment plants are not able to remove a range of pharmaceuticals. The soil and unsaturated zone play an important role in natural attenuation of pharmaceuticals in case of infiltration of pretreated wastewater. The processes in aquifer efficiently remove the residues of majority of pharmaceuticals, but not without exceptions.
    Czech Republic


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