EVALUATING NF FOR DBP CONTROL WITH THE RBSMT

At the center of the rapid bench-scale membrane test (RBSMT) is a tang ential-flow flat-sheet cell with recycle, which represents a different ial element of a full-scale spiral-wound nanofiltration element treati ng the average feed for a full-scale system. The RBSMT incorporates op erational parameters, such as recovery, pressure, crossflow velocity, and hydraulic conditions that approximate field-scale operation. Four conventionally treated surface waters and one untreated groundwater we re evaluated using the RBSMT. All of the waters tested would meet the Stage 1 requirements of the Disinfectants/Disinfection By-product Rule after nanofiltration, and the four surface waters would satisfy the S tage 2 requirements.