7
•
The flushing mode occurs automatically (after manually setting the timer) and is
used to loosen and wash-out particulates deposited on the hollow fiber of the UF
membrane.
•
It's critical that the flushing time be set long enough to wash-out all dirt until clear
water is observed.
•
The flush time may therefore vary depending on the water quality. Typically, 30sec is
set as standard flush time but should be changed at site appropriately.
Fig 5: BUF4 CIP Process
CIP
Ÿ
Inlet solenoid valves closed| Flush Solenoid Valve
Open | Drain solenoid valve open
Ÿ
Settable timer settings - 60min* until no pH change
Ÿ
CIP tank chemical recirculating
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
The Clean in Place (CIP) is performed by circulating CIP chemicals until UF membrane
recovers operating flow and pressure.
•
During the CIP process recirculation of the chemical is done until there is no further
change in the pH of the CIP chemicals which indicate no further chemical reaction is
ongoing.
•
A soak operation can also be included to improve the effectiveness of the cleaning.
•
Soaking for 1-2hrs allows more time for the chemical to react with contaminants that
have attached to the membrane surface or penetrated the fiber wall. To soak, once
the unit is circulating the CIP chemical, power off the unit and close off all ball valves
to ensure CIP chemical stays within the UF membranes for the soak period. After the
soak a routine flushing is performed to remove any remaining particulates and
residual chemicals.
Summary of Contents for BUF 4
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