Batch processes are not a new or innovative wastewater treatment technology, since the first reported fill/draw systems are at least a century old. The sequencing batch reactor (SBR) process has been successfully applied to more than 1,300 plants in the U.S., Canada, and Europe within the last 25 years. In particular, the number of SBR plants in North America is growing rapidly. Many of these facilities have been constructed for small communities, producing less than 1.0 million gallons per day (mgd) of wastewater, although larger plants (up to 230 mgd in Dublin, Ireland) have used SBR technology with similar effluent quality results. Both municipal and industrial wastewater has been successfully treated in SBR systems. A general overview of SBR reactor systems and the technology is presented here, along with a discussion of the additional enhancements of a hybrid SBR designed by Pacific Advanced Civil Engineering, Inc. (PACE) and constructed by Pacific Environmental Resources Corporation, Inc. (PERC). A real-world application using the PACE/PERC design is evaluated.
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