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MERC – Membrane Filter Test Plan
14
6.
Open the outlet valve fully and adjust the inlet flow to 10.0 gpm using the inlet valve.
a.
Record the time, flowrate, pressure drop across the housing, temperature, inlet pressure
and outlet pressure.
b.
Continue to take measurements every 30 minutes and record the data
7.
Open the sample valve after the #4 housing slightly and adjust the flow to the overflow
bucket to about 1800- 2000 ml/min.
8.
Start the low-level TSS measurement system
a.
Verify that the suction line is securely in the overflow bucket
b.
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.
c.
Select a 0.45um filter for testing and record the number.
d.
Insert the filter disk into the holder and screw the top back on, but DO NOT fully tighten.
e.
Remove any trapped air in the holder by VERY briefly turning on the sample pump until
water flows from the top and/or around the threads. Caution: Water will likely spray a
little, so be prepared!
f.
Close the filter holder tightly and make sure the outlet is securely in the measurement jug
g.
Turn on the pump and adjust the pressure to 30 psig
h.
Record the time
i.
Keep track of the volume in the measurement jug. If the level reaches 15 liters, use
another measurement jug to continue measurement and empty the used jug. Continue to
keep track of the total volume filtered until the test is complete.
j.
When the test is complete
i.
Shut off the sample pump
ii.
Shut the sample valve to the overflow bucket
iii.
Record the total volume collected in the measurement jugs
iv.
Carefully remove the filter disk and place it in the small (2”x2”) square filter disk
container (has “Millipore” written on it). Mark the container with the test number and
the filter disk number.
v.
The filter disk will be dried and measured by vendor.
9.
MERC personnel will be responsible for collecting samples for TSS, bacteria, DOC, TOC,
etc.
10. Continue to run the test until the pressure drop across the filter reaches 30 psid, or the total
volume filtered reaches 3000 gallons (5 hours at 10 gpm)
11. When the test is complete
a.
Record the time and pressure drop across the housing, along with the rest of the
measurements outlined in step 5.
b.
Shut off the feed pump
c.
Close the 1” inlet valve
d.
Remove the test filter
i.
Open the vent valve
ii.
Open the drain valve to drain the housing
iii.
Open the housing and remove the filter
iv.
Allow the filter to drain for a few minutes, then place in a plastic bag. Label the bag
with the date and test number. The filter will be dried and weighed by vendor.
12.
If no tests are to be performed immediately after this test, vent and drain the filter housings
and dump all the overflow and measurement collection containers.