Full Description

The design approach of pressure or vacuum type membrane systems in a water treatmentplant (WTP) is different than conventional WTP design due to the general physical principlesof each process. For example, the hydraulic grade line, as well other key designparameters, can change depending on whether a pressure or vacuum type system isselected. This poses a problem for the design engineer as developing contract documentsfor both alternatives would not be cost effective or the best option to minimize the "risk" ofconfusion during the bidding process.To circumvent this problem, it is necessary to implement a membrane procurement processprior to the development of detailed design documents for the proposed WTP. Thisprocurement process consists of three key phases which include prequalification, piloting,and submittal of a detailed proposal for the full-scale design of the membrane filtration WTP.Proposals from the membrane suppliers are evaluated based on the previously definedselection criteria, which includes both qualitative and quantitative criteria. Some examplesof qualitative criteria includes piloting performance (i.e. consistency of finished waterproduct, membrane integrity test procedures, etc.), and proven full-scale performance (largemunicipal plants in service, etc.), while the quantitative criteria consists of total capital cost ofmembrane system and total present worth cost over the life cycle of the membrane system.By using this process, it balances out the cost with the tangible qualitative benefits that onemembrane system may have over another.This paper describes the membrane procurement process used in the design of amembrane filtration water treatment plant. Includes tables, figures.

Product Details

Edition: Vol. - No. Published: 03/01/2007 Number of Pages: 8File Size: 1 file , 320 KB