Optimized Chemical Pretreatment and Membrane Element Performance at a 10 MGD Nanofiltration Plant

The City of Pompano Beach has a 50 million gallon per day (mgd) water treatment plant that includes a 10 mgd nanofiltration (NF) process. The NF process includes five 2-mgd NF units. The units are two-stage, in a 36:16 array. The NF units were previously populated with hybrid of membrane elements that were installed in 2009. These membranes were selected to achieve the City’s permeate hardness, permeate iron, and other permeate quality goals (e.g., color, TDS, organics) and utilized acid and antiscalant chemical pre-treatment to condition the feedwater. In preparation for the 2020 NF Membrane Element Replacement, the City designed, permitted, and constructed a 2:1 array pilot test unit consisting of three full-size (8-inch diameter, 7-element) membrane pressure vessels with independent pre treatment chemical feed systems, cartridge filters, feed pump, and instrumentation. The pilot unit was permitted to withdraw rawwater from the full-scale plant feed water header and discharge concentrate and permeate to the full-scale plant concentrate and permeate headers, respectively.

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