Butry-sur-Oise is a community located in the Val-d’Oise department in the Île-de-France region. It is characterized by an Oceanic climate. The winter temperatures range between 5°C to 12°C in December and January and can get to a maximum of about 25°C during the summer months. The yearly average rainfall is measured at about 758 mm. The case study has been centered in the WWTP at Butry-sur-Oise (see Figure below), that treats on average 1163m³/day of wastewater which corresponds to a nominal capacity of 6700 P.E.

Regarding GW quality, the WWTP does not have a specific tertiary treatment for the elimination of CECs, MPs and ARGs, which can lead to their presence in the effluent, along with certain nutrients like nitrates and phosphates. Due to the possible connection of the watershed to aquifer, GW might present contamination with these pollutants.

Under the NINFA project, the tertiary treatment of secondary treated domestic wastewater will be investigated for possible reuse (focusing on managed aquifer recharge). This will be done by evaluating a combination of low cost AOP, activated carbon (AC) and biofiltration (BF) for the removal of CECs and MPs as well as evaluating the fate of ARGs.