In-situ Denitrification of Nitrate-nitrogen Contaminated Groundwater by a Permeable Reactive Barrier Using Sulfur–Limestone

The remediation effects of a permeable reactive barrier (PRB) using sulfur-limestone are investigated. results show that highly concentrated NO3− (133-180 mg/L) in shallow groundwater decreased below the detection limit within PRB. This phenomenon was maintained for approximately 300 days; therefore, PRB and its durability demonstrated. It is suggested due to not solely restricted area barrier, because decrease extended 4.0 m downstream. Furthermore, ORPSHE, δ15N, isotopic fractionation factor (ɛ) indicate reductive condition forms PRB, where sulfur-oxidizing denitrifying bacterium preferentially exists. Before installing three-dimensional (3-D) flow systems around study site detailed hydrogeological setting should be investigated first.