GIRE-097-2-2
17
PIA
a mm
P1
P2
PIA
b mm
a. Fine screen
The wastewater should be treated by screen with openings of 3.0 mm or under
before flowing into the membrane submerged tank, otherwise the modules are
polluted and clogged with foreign substances seriously. It is recommended to use
the mesh type screen. Overflow or waste carryover must be avoided at any time.
b. Flow control device
A flow rate controller, a flow meter combined with an automatic control valve, or a
flow meter combined with VFD controlled suction pump should be installed on the
permeate water line to control the flow rate of permeate water. In the case of
operating a number of “TMR090 Series” modules simultaneously in one train, it is
advised to install one flow rate controller for one train of the modules.
c. Differential pressure measuring instrument
For trans-membrane pressure (TMP) determination the differential pressure (in the
permeate line and water level) has to be measured and calculated, either by
installing two pressure sensors and calculating the readings in the PLC or by using a
differential pressure device.
In the former case, one pressure gauge should be installed on the permeate water
line and the other one in the membrane submerged tank, to monitor the
trans-membrane pressure. In case of operating a number of “TMR090 Series”
modules simultaneously in one train, it is advised to install one differential pressure
measuring instrument for one train of the modules.
[Example]
Fig.IV-4 Differential Pressure Measurement & Calculation
