Report No DWI0339

SELECTION OF FILTERS FOR REMOVAL OF MICROORGANISMS FROM MAINS WATER

DWI0339

EXECUTIVE SUMMARY

In this desk study, a wide range of clarification filter types have been evaluated for the removal of microorganisms of about 1 micron in size from mains water supplied to institutions such as hospitals and old peoples homes, to protect vulnerable individuals from possible infection. The size of institution could range from 10 to 300 persons. Bag filters, cartridge filters and crossflow filters were considered to have potential for this application and were evaluated in more detail.

Cartridge filters with pleated membrane media are considered to be well suited to the present application. They offer a relatively low cost solution and are simple to operate. A range of potentially suitable cartridges, which retain most or all 1 micron particles, have been identified. In many cases it should be possible to use a standard 3" x 10" cartridge in a compact housing for the required duty. Choice of cartridge will depend in part on factors specific to each application, especially influent water quality.

There is a need for experimental monitoring of the performance of selected cartridges in the treatment of typical feed waters against a more defined requirement.

Copies of this report may be available as an Acrobat pdf download under the 'Pre 2000 Reports' heading on the DWI website.