Activated Sludge II
Modifications to the process can be made in an existing system or in the design process of a new system. Potential operational benefits of modifying the conventional activated sludge system include; increasing organic loading, providing additional nutrients required for proper treatment, accommodating flow rate or organic loading that varies seasonally and achieving nutrient removal.
Another reason for modification of the process is to provide a treatment system that is suitable to the available site conditions. For example, extended aeration systems, especially oxidation ditch configurations, require more space than conventional systems. Alternately, where space is limited, a pure oxygen system or a complete mix configuration would be more suitable.