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MERC – Membrane Filter Test Plan
15
TEST #2
1.
Repeat Test #1, except install Filter #5 (20” 0.1um) in step 5.
2.
Note that Steps 2 and 4 may be skipped if no additional work was required after Test #1
TEST #3
1.
Repeat Test #1, but also include the following
a.
Install Filter #2 ( 20” 20um) in the first housing (#1) as a prefilter
b.
MERC personnel will be responsible for collecting TSS, bacteria, DOC, etc. after the
prefilter (Filter #2). We will not do a low level TSS test on this stream.
c.
If the prefilter (Filter #2) plugs quickly and reaches 30 psid before the final filter
(Filter #1)
i.
Record all measurements per step 6
ii.
Shut down and replace the prefilter (Filter #2)
iii.
Shut down the sample pump for the TSS measurement of the final filter (Filter #1)
while the prefilter is changed, but DO NOT change the 0.45 filter disk.
iv.
Restart the system
v.
Restart the sample pump for the TSS test.
vi.
Record all measurements per step 6.
TEST #4
1. Repeat Test #3, except install Filter #5 (20” 0.1) in the final filter housing (#4)
TEST #5
1.
Repeat Test #1, but also include the following
a.
Install Filter #2 ( 20” 20um) in the first housing (#1) as a prefilter
b.
MERC personnel will be responsible for collecting TSS, bacteria, DOC, etc. after the
prefilter (Filter #2). We will not do a low level TSS test on this stream.
c.
Install Filter #3 (20” 10 um) in the second housing (#2) as another prefilter
d.
Install Filter #4 (20” 5 um) in the third housing (#3) as another pre-filter
e.
Adjust the incoming flow to 11 gpm. This will account for the TSS sample water that will
be removed from the system after the second and third prefilters and keep the final filter
flow at 10 gpm.643
f.
The second and third pre-filters (#3 and #4) will use the low-level TSS test set-up
identical to the final filter (Filter #1)
i.
Start the low-level TSS measurement system
3.
Verify that the suction line is securely in the overflow bucket
4.
Start the sample pump and flow water through the empty 0.45um filter disk holder to remove
excess air. Shut off the pump and discard any water collected.
5.
Select a 0.45um filter for testing and record the number.
6.
Insert the filter disk into the holder and screw the top back on, but DO NOT fully tighten.