TORAY MBR
Instruction Manual
06-G-MB2-NHPAF-220801
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Membrane Module
FIC
FI
L
H
L:CLOSE
H:OPEN
L:
O
PEN
H:
CL
O
SE
Filtrate water outlet
Manifold
Lower Limit alarm
Air Outlet
Feed
Chemical
Air Diffuser
Membrane
Tank
PIA
PIA
“U-shape”
2. Flow Diagram of Membrane Filtration
Two (2) flow diagrams of the membrane filtration process are shown below. One is for gravity
filtration (when site conditions permit) and the other using a suction pump. Also depicted are
major ancillary devices required for the membrane filtration process.
To reduce the risk of membrane clogging, all activated sludge should pass through a
fine mesh screen having openings of 3 mm or less prior to being introduced into the
membrane tank.
Failure to incorporate the screen device may result in large solids clogging
or causing physical damage to the membrane surfaces.
In order to equalize BOD load and filtration flow capacity, it is recommended that a
buffer/equalization tank be installed to help stabilize operation of the biological treatment and
membrane filtration process.
(1) Gravity Filtration Configuration
The filtration process can be accomplished by using elevation differences between the liquid
level of the membrane tank and the level of the filtrate outlet (see Fig. IV-2).
Fig. IV-2 Schematic Flow Diagram for Gravity Filtration (in the case of NHPA150-2F)
LS
Wastewater
Fine Screen
FIC: Flow Rate Indicator/Controller
LS: Level Switch
PIA: Pressure Indicator/Alarm
FI: Flow Meter
