Abstract Summary
Managed Aquifer Recharge (MAR) applied through infiltration surfaces is a technology that enhances groundwater quality. With this improvement goal, the European project MARadentro was initiated. In this project, a prototype was constructed in Medina del Campo, consisting of two ponds with a surface area of 115 m² each and a recharge capacity of 200 m³/day. Reactive layers composed of various biological materials, such as vegetable compost and forest residues, were implemented in the infiltration pond beds. This prototype is fed with the effluent from the wastewater treatment plant (WWTP), and recharge is alternated weekly between the two ponds to reduce the risk of clogging. Eight piezometers were drilled for system monitoring and control. Continuous measurements of water level, electrical conductivity (EC), and temperature are taken in the piezometers located under the ponds, upstream, downstream, and in the effluent. Weekly monitoring includes suspended solids, NO3-, NO2-, NH4+, total nitrogen, total phosph
