In this paper, indirect and direct integrity methods are compared in a challenge
experiment with Bacillus subtillis spores used as a surrogate to Cryptosporidium oocysts.
The challenge study was conducted with a cassette of 3 ZeeWeed(R) 500 ultrafiltration
modules. Results for the intact membrane demonstrated a log removal value (LRV) larger
than 7.0 based on feed concentration. The LRV was reduced to 5.2 with a pinhole and
further to less than 4.0 with the two cut fibers. Turbidity did not allow the detection of the
pinhole or cut fibers. The permeate particle counters did show significant departures from
baseline when the membranes were compromised. Results are compared to LRVs
estimated from a draft ASTM method. Includes 3 references, tables, figures, appendix.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 280 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 12 |
| Published : | 03/05/2003 |
