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Nitrate removal from groundwater by microscale zero‐valent iron and activated carbon: A nonpumping reactive wells experiment
This study investigated treatment of nitrate‐contaminated groundwater by mixing granular activated carbon (GAC, d50 = 1 mm) and microscale zero‐valent iron (MZVI, d50 = 50 nm and specific surface area = 22.5 m2 g−1) in a nonpumping reactive wells (NPRWs) system. A hexagonal pattern of NPRWs was implemented in a laboratory cylindrical aquifer model (80 cm height, Ø 90 cm) filled with natural coarse sand (0.82 mm). Besides NO3− (133 mg L−1), PO43− in elevated concentration (6.21 mg L−1) was also considered as an additional target ion in groundwater (ionic strength = 35 mM). A pumping well in the center of the aquifer model discharges the groundwater at a constant rate of 1 L h−1. A series of batch experiments was conducted to derive the reduction kinetics of the N species and PO43− in water. Based on the results of the batch experiments, a mixture of GAC/MZVI was also used as reactive materials within NPRWs in the aquifer model to remediate the contaminated groundwater. While the average percentage of NO3‐N reduction rate from groundwater by GAC‐based NPRWs was 0.6% g−1, the mixed MZVI/GAC in the same mass indicated an efficiency of 5.5% g−1. The aquifer tests showed that using mixed MZVI/GAC in NPRWs resulted in insignificant changes in pH (+3%) and EC (+7%) of groundwater outflows. The results of this study revealed that using the GAC‐mixed‐MZVI has great potential application in PRB system for nitrate removal from groundwater.
Nitrate removal from groundwater by microscale zero‐valent iron and activated carbon: A nonpumping reactive wells experiment
This study investigated treatment of nitrate‐contaminated groundwater by mixing granular activated carbon (GAC, d50 = 1 mm) and microscale zero‐valent iron (MZVI, d50 = 50 nm and specific surface area = 22.5 m2 g−1) in a nonpumping reactive wells (NPRWs) system. A hexagonal pattern of NPRWs was implemented in a laboratory cylindrical aquifer model (80 cm height, Ø 90 cm) filled with natural coarse sand (0.82 mm). Besides NO3− (133 mg L−1), PO43− in elevated concentration (6.21 mg L−1) was also considered as an additional target ion in groundwater (ionic strength = 35 mM). A pumping well in the center of the aquifer model discharges the groundwater at a constant rate of 1 L h−1. A series of batch experiments was conducted to derive the reduction kinetics of the N species and PO43− in water. Based on the results of the batch experiments, a mixture of GAC/MZVI was also used as reactive materials within NPRWs in the aquifer model to remediate the contaminated groundwater. While the average percentage of NO3‐N reduction rate from groundwater by GAC‐based NPRWs was 0.6% g−1, the mixed MZVI/GAC in the same mass indicated an efficiency of 5.5% g−1. The aquifer tests showed that using mixed MZVI/GAC in NPRWs resulted in insignificant changes in pH (+3%) and EC (+7%) of groundwater outflows. The results of this study revealed that using the GAC‐mixed‐MZVI has great potential application in PRB system for nitrate removal from groundwater.
Nitrate removal from groundwater by microscale zero‐valent iron and activated carbon: A nonpumping reactive wells experiment
Hosseini, Seiyed Mossa (author)
2023-08-01
13 pages
Article (Journal)
Electronic Resource
English
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