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MERC – Membrane Filter Test Plan
3
5micron prefilter #4, 20" length
) and the polish filter system (
Filter #1, 0.1 micron rating, 20" length
). 6.
The final trial will evaluate the efficiency of three prefilters (
20micron prefilter #2, 20" length,
10micron prefilter #3, 20" length, and 5micron prefilter #4, 20" length
) and the polish filter system
(
Filter #5, 0.1 micron rating, 20" length
). (see also table 3.1 below).
Table 3.1 Test plan for membrane filters
Test
Number
Filter Type
1
Filter # 1, 0.1 micron, 20" length
2
Filter # 5, 0.1 micron, 20" length
3
20 micron prefilter #2, 20" length
Filter # 1, 0.1 micron, 20" length
4
20 micron prefilter #2, 20" length
Filter # 5, 0.1 micron, 20" length
5
20 micron prefilter #2, 20" length
10 micron prefilter #3, 20" length
5 micron prefilter #4, 20" length
Filter # 1, 0.1 micron, 20" length
6
20 micron prefilter #2, 20" length
10 micron prefilter #3, 20" length
5 micron prefilter #4, 20" length
Filter # 5, 0.1 micron, 20" length
The inability to successfully complete (without interruption) an individual test trial, will
be considered a “failure”. If a failure is determined to be a result of problems associated with the
MERC test system or process (e.g., problem with ship’s ballast system), the test trial will be
discarded and repeated. If the failure is determined to be a result of the filter system (e.g., a
mechanical failure resulting in an interruption of filtration during a test run), the results will be
noted and included in the final report.
These evaluations will be based upon a simple comparison between organisms and
suspended particles found in pre filtered (35 micron) challenge water (just upstream of the filter
system) and organisms and suspended particles just downstream of the vendor filter system.
Results will be presented as total concentrations (live plus dead) of zooplankton and
phytoplankton, and concentrations of total heterotrophic bacteria and three specific indicator
pathogens,
E. coli
, intestinal
Enterococci
, and toxigenic
Vibrio
cholerae
. , all measured both
before and after the filter system. Total suspended solids (TSS), and particle size distributions
(PSD) will be measured before and after each filter. See Figure 1 and pages 11 and 12
for more
details on the filter evaluation system design.