AWWA WQTC58892

The overall objective of this project was to identify and examine the key issues related toretrofitting existing granular media filters with membrane media filters in large water utilities.Specifically, the infrastructure, engineering, costs, training requirements, and compatibilityissues associated with a large-scale membrane retrofit were addressed.The Kansas City Water Services Department (KCWSD) served as the six-month pilot-testingsite. Settled water from the full-scale treatment plant served as the feed to the pilot units. Thepilot study focused on the evaluation of two retrofit strategies: custom-designed, pressurizedmembrane systems; and, submerged membrane systems. These two strategies are particularlywell suited to retrofit designs and therefore provided the economy-of-scale required for costeffectiveimplementation. The custom-design approach was done with a pressure-vessel style,low-pressure membrane provided by two manufacturers. One of the modules being evaluated was ahigh-packing density, low-flux, low-transmembrane pressure module. The other is a highpermeability module with a standard inside/outside hollow fiber design. Two implementationstrategies were evaluated for the use of the pressurized vessel membranes at Kansas CityMissouri Water Treatment Plant. The first approach was to utilize the existing head in the plantbetween final clarification and the clearwell in order to provide the operating pressure requiredfor filtration. The second approach used feed pumps to provide the pressure required for ahigher flux, lower capital alternative.The specific objective of the six-month pilot study was to establish a design flux and recovery,and to characterize and quantify membrane residuals for each membrane system tested. Thesedesign parameters are being used to facilitate the development of retrofit designs and costestimates.

Product Details

Edition:

Vol. - No.

Published:

11/02/2003

Number of Pages:

5

File Size:

1 file , 240 KB