ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual page 544

Arrange for delivery of fresh seed sludge from an activated sludge system employing
a suspended growth type process. If it is possible, obtain seed sludge from a facility
treating similar wastewater and operated with similar processes (nitrification etc).
b. If possible drain the water used for clean water testing from the aeration tank. This will
minimize dilution of the seed bacteria.
c. Pump seed sludge through the screen module to remove any debris that might
damage the membranes. This can usually be done by slowly dumping the seed into
the closest lift station. Ensure screen process and feed pumps to aeration tank are in
"AUTO" mode.
d. If a primary clarifier is included and there is a screen between the aeration tank and
membrane tank: Add seed sludge directly to the aeration tank.
e. Once aeration tank liquid level has filled above 30% with seed sludge, turn aeration
tank blowers to "AUTO" mode.
f. Continue adding remaining seed sludge.
g. Once all seed sludge has been pumped into the aeration tank take note of the liquid
level. If the aeration tank is full then continue to Step 2. If the aeration tank is not full
then continue to fill the aeration tank 15% of its total volume per day using raw
wastewater. This is to avoid shocking the bacteria with excess BOD, reducing the risk
of forming foam causing bacteria and reducing the impact of un-metabolized BOD on
the membranes.
Dry Seed
a. If possible drain the water in the aeration tank used for clean water test. This will
minimize dilution of the seed bacteria.
b. Turn screen module and feed pump(s) to aeration tank to "AUTO".
c. Allow aeration tank to fill to 30% with raw wastewater, and then turn off screen
module and feed pump(s).
d. Remove the access cover from the aeration tank.
e. Adjust the DO probe and pH probe positioning in the aeration tank until both probes
are submerged in the wastewater.
f. Turn aeration tank blowers to "HAND" to ensure vigorous mixing when adding dry
seed bacteria. Note: When set to "HAND" the blowers will only run for 2 minutes. If
this time runs out before all the dry bacteria have been added, then the blowers must
be set to "OFF" and then back to "HAND".
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