Nitrates are increasingly being monitored in discharges, and require to be removed. How can this be achieved to avoid this contaminant being present in the extended aeration effluent?
A. Enviros Consulting are leaders in the implementation of efficient denitrification as an additional process stage before discharging the extended aeration (nitrification) treated effluent. Nitrogen in nitrate, produced during initial nitrification of ammoniacal-N, is converted during denitrification to nitrogen gas, which is vented to the atmosphere in this process, so there are no harmful by-products. (Nitrogen is already present in air in substantial quantities.) The denitrification stage can frequently be achieved in the same tank, thus making this technique highly cost effective. However, a carbon/BOD source addition is normally required which will entail some additional running cost. Copies of published papers are available free of charge by emailing steve.last@enviros.com).
