The overall objective of this project was to identify and examine the key issues related to
retrofitting existing granular media filters with membrane media filters in large water utilities.
Specifically, the infrastructure, engineering, costs, training requirements, and compatibility
issues associated with a large-scale membrane retrofit were addressed.
The Kansas City Water Services Department (KCWSD) served as the six-month pilot-testing
site. Settled water from the full-scale treatment plant served as the feed to the pilot units. The
pilot study focused on the evaluation of two retrofit strategies: custom-designed, pressurized
membrane systems; and, submerged membrane systems. These two strategies are particularly
well suited to retrofit designs and therefore provided the economy-of-scale required for costeffective
implementation. 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 a
high-packing density, low-flux, low-transmembrane pressure module. The other is a high
permeability module with a standard inside/outside hollow fiber design. Two implementation
strategies were evaluated for the use of the pressurized vessel membranes at Kansas City
Missouri Water Treatment Plant. The first approach was to utilize the existing head in the plant
between final clarification and the clearwell in order to provide the operating pressure required
for filtration. The second approach used feed pumps to provide the pressure required for a
higher 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. These
design parameters are being used to facilitate the development of retrofit designs and cost
estimates.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 240 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 5 |
| Published : | 11/02/2003 |
