Denitrification of a Nitrate-Rich Synthetic Wastewater Using Various Wood-Based Media Materials

摘要

This laboratory study examined the use of various wood materials as a carbon source in horizontal flow niters to denitrify nitrate-nitrogen (NO_3-N) from a synthetic wastewater. The filter materials were: sawdust (Pinus radiata), sawdust and soil, sawdust and sand, and medium-chip woodchippings and sand. Two influent concentrations of NO_3-N, 200 mgL~(-1) and 60 mgL~(-1), loaded at 2.9 to 19.4 mg NO_3-N kg~(-1) mixture, were used. The horizontal flow filter with a woodchippings/sand mixture and an influent NO_3-N concentration of 60 mgL~(-1), which operated over a study duration of 166 days, performed best, yielding a 97% reduction in NO_3-N at steady-state conditions.