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Low-pressure membrane filtration systems are becoming increasingly popular as utilitiesbegin upgrading their existing conventional water treatment systems. This paperpresents the key issues and challenges involved in designing a membrane system'sancillary equipment. The design of a 50-million-gallons-a-day (mgd) (expandable to 60-mgd) submerged membrane system and related ancillary equipment at the RacineWater Utility (Racine, Wisconsin) is used as a case study. Although the focus ofmembrane system design is often concentrated on membrane-related parameters, suchas type of membrane, number of fibers, configuration of module, flux rate, andperformance, the real challenge to successful membrane system implementation is thedesign of integrated ancillary equipment needed to operate the system. In order for themembrane system to achieve its performance goals, the support equipment has to beproperly designed.Membrane system ancillary equipment is responsible for the operation of the system.The day-to-day operation of a low-pressure membrane system involves multipleprocesses, including permeation/filtration, backwash, various cleaning routines, andintegrity testing. Ancillary equipment required for the successful operation of themembrane system include such components as dedicated pumps, blowers,compressors, chemical systems and control systems. Membrane suppliers typicallywork with the engineer and the owner on the design of such components to integratemembrane system requirements with plant, site, and operational requirements. Includes tables, figures.

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Edition: Vol. - No. Published: 06/17/2004 Number of Pages: 11File Size: 1 file , 390 KB