Full Description

A 20 MGD water treatment facility, designed and constructed in the early 1990s was slated for asignificant hydraulic expansion to 42 mgd. The design was to be executed with the Long Term 2 Enhanced Surface Water Treatment Rule(LT2) requirements looming on the horizon. The Owner desired to provide the expansion facilities whilesimultaneously integrating new process elements capable of assuring compliance with the worst caseCryptosporidium inactivation/removal requirements of LT2.Two process trains were considered for expansion, conventional clarification/filtration with ultraviolet (UV)disinfection versus conventional clarification with membrane filtration. Both options would be capable ofmeeting the disinfection requirements of source water classified in Bin 4 and requiring 5.5 logCryptosporidium removal/inactivation value, if necessary.The clarification/membrane filtration process was selected based on a relative cost comparison, siteconsiderations favoring a smaller footprint and preservation of space for subsequent expansions, andconsideration that a highly effective removal capability was preferable to a specific microbe targetedinactivation process.This paper describes selection and procurement considerations critical to integration of membrane filtrationinto the existing process train. The proposed design is illustrated. Includes tables, figures.

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Edition: Vol. - No. Published: 03/01/2005 Number of Pages: 17File Size: 1 file , 540 KB