AWWA MTC50259

This paper discusses the preparation, protocol and results of the bacillus spore challenge test, which had never been carried out on a full scale operating water treatment facility. This test demonstrates the effectiveness of such a technique in evaluating membrane integrity of a full scale treatment facility, and the capability of a USF Memcor CMF plant to effectively reject particles smaller than pathogenic bacteria and protozoa of primary concern in drinking water applications. Based on spore dosing at high concentrations the plant achieved a >log 6 rejection of B. megaterium spores. The test at the Oropi WTP illustrated the capability of a >log 5.5 rejection, and demonstrates the repeatability of the performance of USF Memcor CMF systems, and how pilot scale results can predict the performance of a full scale facility. The Challenge test also demonstrated that where the bacillus spore levels in the feed are low it is not practical as a monitoring technique, only serving to demonstrate integrity. Where natural bacillus spore levels exist though, they may not be as useful as B megaterium as an indicator because of their propensity to exist in the environment and represent an ambient source of contamination. Includes 10 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

01/01/1999

File Size:

1 file , 300 KB