Nitrogen Removal in Woodchip-based Biofilters of Variable Designs Treating Agricultural Drainage Discharges

Subsurface flow wetlands with a woodchip‐based biofilter are known to act as effective measures in mitigating site‐specific nutrient losses in agricultural drainage. To optimize operation, the combined effect of water temperature, hydraulic residence time (HRT), and filter design is fundamental. This 2‐yr study evaluated a combination of three flow designs and two woodchips mixtures at a test facility receiving agricultural drainage discharge...