Full Description

In response to a desire for improved water quality and continued population growth in thesouthern portion of Florida's Miami-Dade County (MDC), Miami-Dade Water and Sewer Department (MDWASD) has initiated the design and permitting of the firstmembrane softening water treatment plant (WTP) and associated improvements, consisting ofa wellfield, raw and finished water transmission mains, and a ground storage reservoir, with atotal capital budget in excess of $100 million. MDWASD was faced with the challenge ofselecting a membrane treatment technology that would meet the dual treatment objectives ofmembrane softening while reducing nitrates. A comprehensive two-phase pilot testing programwas implemented to characterize the local raw water quality. A two-phase program was usedto first confirm the membrane design criteria for the project and to then select manufacturersand membrane elements that would meet MDWASD's primary treatment objectives withrespect to hardness and nitrates.The proposed 20-million-gallons-per-day (mgd) South Miami Heights water treatment plant(SMH WTP) will have an integrated membrane approach using parallel treatment trains ofultra-low pressure/nanofiltration (ULP/NF) and ultrafiltration (UF) membrane systems. Thisintegrated membrane approach will blend the finished water from the ULP/NF and UFmembrane systems to provide multiple barriers for the treatment of this shallow aquifer watersupply source. This paper describes the SMH WTP treatment process and methodology usedto select the proposed membrane treatment technology, which will reduce hardness andnitrate levels. The pilot testing results from the two-phase pilot testing program were used to identify and select the proposed membrane configuration. Finally, a cost estimate for theconstruction of the proposed 20-mgd SMH WTP is presented as the final design of the projectgoes through the permitting process prior to procurement and bid advertisement. Includes tables, figure.

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Edition: Vol. - No. Published: 06/17/2005 Number of Pages: 19File Size: 1 file , 350 KB