ABSTRACT
Note that the solids in the aeration tank and final clarifier are determined separately and are then added to determine total solids in the system.
The second method of calculating system solids includes a measure of aeration tank solids (using mglL MLSS) and an estimate of final clarifier solids (using an average SS value of the sludge blanket). This average SS value of the sludge blanket is obtained by determining the SS concentration at the top of the sludge blanket (=presented by the MLSS concentration) and the SS concentration at the bottom of the sludge blanket (represented by the RAS SS concentration).* Again, note that the solids in the aeration tank are added to the solids in the sludge blanket to determine total solids in the system.
