OXIDATION DITCHES FOR TREATMENT OF SEWAGE FROM SMALL COMMUNTIES FIG. 5 THE OXIDATION DITCH IN ITS SIMPLEST FORM, JUST AFTER STARTING OPERATION Thefoam disappears when enough sludge Is formed. DIFFERENT METHODS OF OPERATION The intermittent system This is the system chosen when the sewer system has a certain storage capacity. The ditch .
Most oxidation ditches are designed to achieve CBOD removal and nitrification. However, many NPDES permits may become more restrictive in the future with respect to the discharge of total nitrogen or total inorganic nitrogen. Therefore, modifying oxidation ditches to include an anoxic zone to achieve de-nitrification is an excellent way, Oxidation Ditch –History and Overview • First used in Holland in 1950’s –“Dutch Ditch” by A. Pasveer • Single race track configuration, shallow depth • Surface aerator to provide mixing and aeration, horizontal “Kessener” brush • Extended aeration, Oxidation Ditches DESCRIPTION An oxidation ditch is a modified activated sludge biological treatment process that utilizes long solids retention times (SRTs) to remove biodegradable organics. Oxidation ditches are typically complete mix systems, but they can be modified to approach plug flow conditions. (Note: as conditions approach
