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UID:pretalx-flowpath-2025-SMHWVL@talks.staging.osgeo.org
DTSTART;TZID=CET:20250612T142000
DTEND;TZID=CET:20250612T143000
DESCRIPTION:Managed Aquifer Recharge (MAR) technique based on the Forested 
 Infiltration Area (FIA) is being tested to mitigate groundwater nitrate co
 ntamination\, due to intensive agricultural activity\, in a sandy aquifer 
 within the Nitrate Vulnerable Zone of Arborea (central-western Sardinia). 
 The research is being carried out within the NATMed project (https://natme
 d-project.eu/) (2023-2026)\, funded under the EU PRIMA Programme.\nThe FIA
  system is implemented in a pilot site of around 0.4 ha and it is supplied
  by drainage water with an average nitrate concentration of 70 mg L-1\, co
 ming from a nearby dewatering pumping station. The infiltration process oc
 curs through six recharge trenches\, with a total length of 300 meters and
  one meter deep\, placed between rows of Eucalyptus and Poplar trees. The 
 recharge water is treated before infiltration by a Passive Treatment Syste
 m (PTS) installed within the trenches. It consists of a mixture of Eucalyp
 tus wood chips (50% of volume) and inert material\, whose function is to p
 romote the denitrifying bacteria action\, reducing nitrate (NO3) to atmosp
 heric nitrogen (N2). Eventually\, when the PTS effectiveness is reduced an
 d the planting is fully developed\, denitrification will be sustained by s
 ymbiotic bacteria residing on the tree root systems.\nIn two years of hydr
 ogeochemical monitoring\, a noticeable reduction of nitrates up to 85% in 
 the infiltrating water and a significant decrease in groundwater nitrate c
 oncentration have been observed. These results suggest that the FIA techni
 que is an efficient Nature-Based Solution for decontaminating waters pollu
 ted by nitrates. However\, a considerable amount of soluble phosphate is r
 eleased by the PTS\, leading to an increase in the concentration of this p
 ollutant in groundwater. Laboratory and field tests on some materials able
  to remove phosphate before infiltration are ongoing\, with promising resu
 lts
DTSTAMP:20260427T221743Z
LOCATION:Room R3
SUMMARY:Forested infiltration Area (FIA) as Nature-based Solution to mitiga
 te groundwater nitrate contamination in the Nitrate Vulnerable Zone (NVZ) 
 of Arborea (Sardinia\, Italy) - Alberto Carletti
URL:https://talks.staging.osgeo.org/flowpath-2025/talk/SMHWVL/
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