GIRE-097-2-2
16
Membrane Module
Air diffuser
FIC
Permeate water
Manifold
PIA
Lower limit alarm
Air outlet
Feed
chemical
FI
L
H
L:
O
PEN
H:
CL
O
SE
L:CLOSE
H:OPEN
VFD or auto valve
PIA
(2) Pump suction configuration
Figure Fig. IV-3 illustrates the general configuration for pump suction filtration.
Fig.IV-3 Schematic Flow Diagram for Pump Suction Operation
The permeate water flow is controlled by a flow meter and a suction pump with an automatic
control valve or by a flow meter and a suction pump with VFD control. In case water level in
the membrane submerged basin gets to the lower limit, filtration has to be stopped. If the
water level reaches the upper limit, the level controller will stop raw water inflow.
In some cases with this pump suction configuration, an equipment may be needed to
discharge the air accumulated in the permeate water line. A range of methods can be applied
for this air removal such as vacuum pump, ejector or manual water injection. Please contact
TORAY or refer to the engineering manual for the details.
(3) Necessary devices for membrane filtration process
Major necessary peripheral devices to operate membrane filtration process are explained
below. Some other devices than mentioned below might be required case by case.
Raw water
Fine screen
FIC : Flow rate indicator/Controller
LS : Level Switch
PIA : Pressure indicator/Alarm
FI : Flow indicator
LS
