AWWA ACE70670

This powerpoint presentation begins by providing a brief overview of waterborne disease, and the risk that viruses present because of their smaller size and increased mobility. The research hypothesis is as follows:penetration of viruses through ultrafiltration (UF)membranes cannot be explained by any ofpreviously proposed mechanisms; and,changes in virus penetration are dynamicand related to UF pore size and transmembrane pressure (TMP)during regular operation. The rejection prediction states that the UF membrane should pose anefficient barrier to the penetration ofbacteriophage T4, in contrast to MS2 andX174 that are 10 times of magnitudesmaller than T4. Study conclusions indicate that: UF membranes do not provide theabsolute barrier for viruses;penetration mechanism of phagesthrough nanopores has its origins inTMP - the pressure causes enlargement ofpores, with time enabling the viruses topass through them; and,complete virus retention cannot beobtained with UF membrane processes,and therefore, in water treatmentapplications optimal TMPs must bedetermined. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2009

Number of Pages:

18

File Size:

1 file , 1.8 MB