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Sequencing Batch Reactor Source: CASS Water Engineering, Inc. The cyclic activated sludge system is engineered to deal with wastewater treatment problems in domestic, municipal, or industrial plants CASS Water Engineering, Inc.activated sludge system (CASS) is engineered to deal with wastewater treatment problems in domestic, municipal, or industrial plants. It can be used for small and medium scale applications, as well as for large scale municipalities (55 MGD). The system is also applicable for use in the modular expansion, retrofit, or upgrading of existing wastewater treatm...