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.

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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.

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