FULL-SCALE TEST OF METHANOL ADDITION FOR ENHANCED NITROGEN REMOVAL INA LUDZACK-ETTINGER PROCESS

Methanol addition to a Ludzack-Ettinger process was rested as a shea-t erm means of decreasing effluent nitrogen concentrations. Results from three experiments yielded gains of 0.05 to 0.11 mg nitrate decreased per milligram methanol added. Applications of the International Associ ation on Water Pollution Research and Control Activated Sludge Model N o. 1 corroborated these gains, suggesting that the activated sludge wa s able to metabolize the added methanol without acclimation. Model run s indicated that 70 to 80% of the increased nitrogen removal was from enhanced denitrification, with the balance from increased uptake of ni trogen for biosynthesis.