6
Normal operation refers to the routine operating sequence of a system and includes the
filtration and flushing steps. At initial startup, the UF membranes are flushed for 3hrs to
remove any residual chemicals.
•
This is done by manually adjusting the timer box settings to extend flushing time. The
flush process does not make filtrate.
•
After the start up forward flush is done, the UF membrane can be placed in the
filtration mode by manually adjusting the timer settings.
•
A filtration cycle ranges from 6 to 30 minutes and while in operation, all the feed
water is converted into a filtrate. As contaminants are removed during the filtration
mode, the trans-membrane pressure (TMP) increases (difference in pressure
between the feed and the filtrate line).
•
At the end of the set filtration cycle time, a flushing (cleaning) sequence will be
triggered automatically for the flush duration set and the process is routine and
repetitive during normal operation.
Fig 4: UF Membrane Flushing
Flushing
Ÿ
Inlet solenoid valves closed| Flush Solenoid Valve
Open | Drain solenoid valve open
Ÿ
Settable timer settings - 30 Secs*
Ÿ
Flush tank filtrate water level falling
Pump
Controller
To Drain
Solenoid
Inlet
Valve
Feed
120 Microns
Strainder
Solenoid
Flush
Valve
Flush
CIP
Tank
100LT
Drain
Solenoid
Drain
Valve
FILTRATE
Dayliff UF Membrane
Summary of Contents for BUF 4
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