Abstract
The denitrification process in a soil column (60 cm in depth) was studied by use of an ultrafiltrated secondary effluent from a wastewater treatment plant. At the steady-state of the denitrification, more than 90% of NO3-N was removed from the secondary effluent within the depth of 0-5 cm in the soil column. The material-balance study showed that 1) 30-50% of TN fed was collected as N2 gas, 2) 38-39% of TN was accumulated in the soil, probably as organic nitrogen, and 3) 4% of TN was escaped from the column as N2 gas dissolved in the effluent.
The rate of the denitrification were determined by use of finite-difference procedure as an inverse problem for a convection-dispersion equation including a reaction term.
