Non-equilibrium model for solute transport in differently designed biofilters targeting agricultural drainage water.
Water Sci Technol
; 76(5-6): 1324-1331, 2017 Sep.
Article
in En
| MEDLINE
| ID: mdl-28953459
ABSTRACT
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.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Water Movements
/
Water Pollutants, Chemical
/
Waste Disposal, Fluid
/
Agriculture
/
Wetlands
Type of study:
Prognostic_studies
Language:
En
Journal:
Water Sci Technol
Journal subject:
SAUDE AMBIENTAL
/
TOXICOLOGIA
Year:
2017
Document type:
Article