The GR configuration is designed for smaller sized treatment plants. It consists of a central circular clarifier surrounded by an outer concentric aeration basin. The nested arrangement combines biological treatment and final clarification in one simple, compact package.
The chief advantage of the GR is that it optimizes the space required for a treatment plant. It is very “footprint-friendly.” It also offers the advantages of common wall construction. With outside diameters up to 168’, a single GR aeration/clarification system can handle average daily flows of up to 1.5 MGD.
Schreiber Continuously Sequencing Reactors (CSRs) are available in combination with several other various features and each such unique combination is termed a “configuration.”
The GRO configuration is the basic single basin CSR configuration. It consists of one circular basin with a rotating bridge that supplies both the low energy mixing and the mixing-independent aeration to achieve BNR in a single basin. The GRO configuration is typically selected for use in the larger facilities, since a single GRO basin can be constructed up to 184’ in diameter and is capable of handling average daily flows of more than 3.0 MGD.
The GRD configuration is designed to provide a dedicated mixed, unaerated denitrification zone in the center portion of an aeration basin. This concentric center zone can serve as a fixed anoxic or anaerobic zone or as a selector. This center zone is surrounded by an aeration basin in the form of a concentric annular ring. This aeration basin may also function as a CSR.
The GRD arrangement reduces the recycle energy that would be required by competing multi-tank biological treatment systems. It is “footprint-friendly” and offers the advantage of common wall. With outside diameters up to 184’, a single GRD system can handle average daily flows of more than 3.0 MGD.
