ABSTRACT
The results are presented from a quality survey on 3 sites with Artificial Recharge (AR) and 2 with Bank infiltration (BI), using rows of monitoring wells. The main differences between AR and BI systems relate to: the selective intake and pretreatment (AR only), the ability to manipulate the spreading pond (AR only), the transport length and detention time in the aquifer (BI » AR), interaction with anoxic Holocene aquitards (BI > AR), and complexicity of the whole system (AR > BI). Bank filtrate exhibited 4 times more different organic micropollutants than dune filtrate. The redox environment proved here, with calcite saturated waters, to be the chemical ‘master-variable’. For many micropollutants the specific ‘redoxe barrier’ could be established, where these pollutants degrade or precipitate. The current concentrations of many pollutants in AR and BI systems are in general lower than during surveys in the 80s.
