I'm attempting to get P and N removal at an old WWTP and want to reuse the existing basins in rebuilding this plant. Things in pathetic shape. This is a new proposed AeroMOD plant. The old plant's were not well thought out, but the new design seems well thought out.
This proposed tank is right behind grit removal w/ residence time of ~ 1 hour. My understanding is that Phosphorus will be released in solution. A selector tank is next and the influent is mixed with the clarifier return and then on to the aeration tank. The P will be taken up from solution for biomass synthesis for biochemical
synthesis in the aeration tank. Some of the mixed liquor, and solids that have accumulated on the floor of the basin beneath the aeration grid, are removed to a digester. So some of the P is removed from the process. The next portion of the treatment train is an anoxic basin where air is pulsed on and off on a two hour basis. Denitrification will occur at this point in the process. From there the mixed liquor goes to a clarifier where the solids will be returned to a selector tank and mixed with influent prior to entering the aeration basins or removed to a digester.