TY - JOUR
T1 - Non-equilibrium model for solute transport in differently designed biofilters targeting agricultural drainage water
AU - Pugliese, Lorenzo
AU - Bruun, Jacob
AU - Kjaergaard, Charlotte
AU - Hoffmann, Carl Christian
AU - Langergraber, Guenter
PY - 2017/9
Y1 - 2017/9
N2 - Biogeochemical processes in subsurface flow constructed wetlands are influenced by flow direction, degree of saturation and influent loading position. This study presents a simulation tool, which aims to predict the performance of the unit and improve the design. The model was developed using the HYDRUS program, calibrated and verified on previously measured bromide (Br-) pulse tracer tests. Three different hydraulic designs (Horizontal (HF), Vertical upward (VF-up), Vertical downward (VF-down) and two different flow rates: Low (L), and High (H)) were investigated. The model simulated well the Br- transport behaviour and the results underline the importance of the hydraulic design. Calibrated model parameters (longitudinal dispersivity, immobile liquid phase, mass transfer coefficient) showed a common trend for all the designs, for increasing flow rates within the investigated range. The VF-down performed best, i.e. had the highest hydraulic retention time.
AB - Biogeochemical processes in subsurface flow constructed wetlands are influenced by flow direction, degree of saturation and influent loading position. This study presents a simulation tool, which aims to predict the performance of the unit and improve the design. The model was developed using the HYDRUS program, calibrated and verified on previously measured bromide (Br-) pulse tracer tests. Three different hydraulic designs (Horizontal (HF), Vertical upward (VF-up), Vertical downward (VF-down) and two different flow rates: Low (L), and High (H)) were investigated. The model simulated well the Br- transport behaviour and the results underline the importance of the hydraulic design. Calibrated model parameters (longitudinal dispersivity, immobile liquid phase, mass transfer coefficient) showed a common trend for all the designs, for increasing flow rates within the investigated range. The VF-down performed best, i.e. had the highest hydraulic retention time.
KW - COLUMNS
KW - FLOW CONSTRUCTED WETLANDS
KW - HYDRUS
KW - MASS-TRANSFER
KW - PATTERNS
KW - RATIO
KW - REMOVAL
KW - RESIDENCE TIME
KW - SOILS
KW - SORBING POROUS-MEDIA
KW - horizontal flow
KW - non-equilibrium solute transport
KW - numerical modelling
KW - subsurface flow constructed wetland
KW - vertical flow
KW - woodchip-based biofilter
UR - http://www.scopus.com/inward/record.url?scp=85030531301&partnerID=8YFLogxK
U2 - 10.2166/wst.2017.298
DO - 10.2166/wst.2017.298
M3 - Journal article
C2 - 28953459
SN - 0273-1223
VL - 76
SP - 1324
EP - 1331
JO - Water Science and Technology
JF - Water Science and Technology
IS - 6
ER -