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3.3 Start Up and Start-up pre-checks
Once the UF membranes supplied loose along with the equipment are installed inside the
housing that carry the membranes, the following procedures should be followed for the
start-up of Ultrafiltration unit. Manually start the equipment during initial operation. Flush
the UF unit to remove the particles, debri and preservative storage solution before
operating the equipment. Target a filtrate flow of 60% of design during initial operations.
After 24 hours, the filtrate flow can be adjusted to design conditions. Check all valves have
been opened or closed appropriately and both raw water and storage tanks are
connected.
Start the equipment by following the steps below:
1. Plant power source should be powered through an Automatic Voltage Switch (AVS).
2. Confirm timer settings okay (Filtration 30mins /Flushing 30sec).
3. Connect the loose CIP/Flush tank to the inlet and clean water lines of the UF unit.
4. Start the feed pump by switch ON the power socket.
5. Confirm the flushing operation is draining waste water from the unit.
6. Once flushing is complete, confirm filtration time is properly set.
7. Record the feed pressure and the filtrate pressure from the pressure gauges.
8. Confirm proper operation of float valve in the Flush/CIP tank.
9. Confirm filtrate water quality is okay.
10. Confirm dry running protection by closing and opening the raw water source.
3.4 Module Flushing
The Ultrafiltration membranes should be rinsed prior to startup to remove preservative
fluid shipped in the UF membranes. Flushing should be performed until no foam is
observed in the wash water. Depending on the treatment application, additional rinsing or
disposal of the filtrate may be required.
3.5 Shut Down
•
To conduct a manual shut down the power socket should be turned off. It's however
important to perform a flushing operation before shutting down the unit especially
where the unit will be off for extended periods of time.
•
If the equipment is down for more than two days, potential buildup of particulates
and colloidal matter on the surface of the membranes is highly prevalent. High
transmembrane pressure (TMP) indicates clogging and presence of contaminants
on the surface of the UF membranes. 60 minutes of UF operation per day can
protect the equipment from bacterial fouling. If the equipment is down for more than
seven days, add a storage solution i.e. preservative (1% NaHSO3), and close all
valves to ensure preservative is stored within the UF membrane. During the long-
term storage, pH should be checked monthly. Replace the storage solution if the pH
is above 3. During shut down, the UF membrane should always keep moist.
Summary of Contents for BUF 4
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