Toray TMR140 Series User manual

AIRE-064-1-6
Submerged Membrane Module
for MBR
TORAY “MEMBRAY”
“TMR140 Series”
Instruction Manual
Toray Industries, Inc.
Water Treatment Division
1-1, Nihonbashi-muromachi 2-chome, Chuo-ku, Tokyo 103-8666 Japan
Tel: [phone]
Fax: [phone]
URL: http://www.toraywater.com
Published: April 2013

AIRE-064-1-6
Content
I. INTRODUCTION ..................................................................................................................... 1
1. Features of MBR ................................................................................................................... 1
2. Outline of “TMR140 Series”................................................................................................... 2
II. FOR SAFE OPERATION OF “TMR140 SERIES”.................................................................. 5
1. Unpacking and Installation .................................................................................................... 5
2. Operation and Maintenance.................................................................................................. 6
3. Chemical Cleaning of Element.............................................................................................. 7
III. SPECIFICATIONS AND PERFORMANCE OF “TMR140 SERIES” ...................................... 9
1. Specifications of Element ...................................................................................................... 9
2. Specifications of Polyurethane Permeate Tube.................................................................... 9
3. Specifications and Performance of “TMR140 Series” Module............................................ 10
IV. MEMBRANE FILTRATION PROCESS DESIGN FOR “TMR140 SERIES”......................... 12
1. Standard Time Chart ........................................................................................................... 12
2. Flow Diagram of Membrane Filtration................................................................................. 13
3. Layout of “TMR140 Series” Modules in Membrane Submerged Tank ............................... 18
4. Piping................................................................................................................................... 21
V. INSTALLATION OF “TMR140 SERIES”............................................................................... 23
1. Preparatory Procedure ........................................................................................................ 23
2. Unloading/lifting Products.................................................................................................... 23
3. Checking Products .............................................................................................................. 24
4. Storage Products................................................................................................................. 24
5. Installation Products ............................................................................................................ 25
VI. START OF OPERATION...................................................................................................... 30
1. Clean Water Operation........................................................................................................ 30
2. Seeding Sludge Injection..................................................................................................... 31
3. Actual Filtration Operation................................................................................................... 31
VII. OPERATION CONTROL ...................................................................................................... 33
1. Standard Operating Conditions........................................................................................... 33
2. Operating Parameters ......................................................................................................... 35
3. Basic Control Philosophy .................................................................................................... 36
4. Daily Inspection ................................................................................................................... 37
VIII. MAINTENANCE OF “TMR140 SERIES” .............................................................................. 40
1. Maintenance Items and Maintenance Frequency............................................................... 40
2. Air Diffuser Cleaning............................................................................................................ 41
3. Chemical Cleaning of Element............................................................................................ 43
4. Chemical Agents Available for Chemical Cleaning............................................................. 43
5. Handling of Chemical Agents.............................................................................................. 44
6. Chemical Cleaning Procedure............................................................................................. 47
7. Lifting Procedure ................................................................................................................. 52

AIRE-064-1-6
8. Storage Products after Use................................................................................................. 53
9. Disposing Procedure ........................................................................................................... 54
IX. REPLACEMENT PARTS LIST ............................................................................................. 55
X. TROUBLESHOOTING.......................................................................................................... 56
XI. APPENDIX ............................................................................................................................ 57
Symbols used in this manual
This symbol is used to indicate an imminent hazardous situation
which, if not avoided, will result in serious injury or death.
This symbol is used to indicate a potentially hazardous situation
which, if not avoided, can result in serious injury or death.
This symbol is used to indicate a potentially hazardous situation
which, if not avoided, may result in injury or property damage.
DANGER
!
WARNING
!
CAUTION
!

AIRE-064-1-6
1
I. INTRODUCTION
Toray "MEMBRAY" is the submerged membrane module suitable for the membrane
bioreactor (MBR) that has been developed based on the polymer science and the membrane
fabrication technologies accumulated for a long time in Toray Industries, Inc.
"TMR140 Series" is a standard model of "MEMBRAY". This manual explains MBR's features
and describes the specifications of "TMR140 Series" and its safe operations including
installation, operation, maintenance procedures and peripheral equipments. Operators
should thoroughly read this manual to ensure stable operation.
1. Features of MBR
The process flow of the conventional activated sludge system (CAS) and MBR are shown in
Fig.I-1 and Fig.I-2, respectively.
MBR provides the following advantages:
(1) Small Footprint
Unlike CAS, MBR separates sludge within aeration tank using membranes, thus eliminate
the space for preparing sedimentation tank. Also with membrane, MBR can hold higher
concentration of activated sludge in the aeration tank, so its volume can be reduced. As a
result, MBR provides smaller footprint compared to CAS.
(2) High quality of treated water
MBR removes suspended solid (SS) from the sludge liquid with membrane much more
certainly than conventional sedimentation process. MBR also rejects microorganisms such
as Escherichia coli and Cryptosporidium efficiently.
Sedimentation Tank
Waste
water
Aeration Tank
Discharge
Wastewater
Discharge or Reuse
Reuse
RO
membrane
Submerged
M
embrane
Module
Membrane
Submerged
Tank
Fig. I-1 CAS Flow
Fig. I-2 MBR Flow

AIRE-064-1-6
2
2. Outline of “TMR140 Series”
“TMR140 Series” is the membrane module composed of the element block and the aeration
block. The element block contains a number of membrane elements stacked at equal
clearance, each of which has flat sheet membranes attached on both sides of ABS panel.
Each element is connected via polyurethane tube to the permeated water manifold. The
aeration block consists of coarse-bubble air diffusers to supply scouring air (see Fig.I-3).
This module is used submerged in sludge liquid.
The following shows the features of “TMR140 Series”.
Fig. I-3 Appearance of “TMR140-100S”
Element
Coarse Air
diffuser
Tube
Permeated water Manifold
Element block
Aeration block

AIRE-064-1-6
3
(1) Shape of Element
The membrane element is a flat sheet type as shown in Fig.I-4. At the normal filtration
operation, the sludge accumulated on the membrane surface is cleaned up effectively with
upward water stream generated with the scouring air supplied from the air diffusers installed
at the bottom side (Fig.I-5). This mechanism ensures stable filtration, since the membrane
does not easily admit of sludge adherence to its surface.
In addition, thanks to the long element design (1.6 m), a larger membrane area is achieved
per footprint, allowing effective use of diffused air.
Fig. I-4 Structure of Element
Fig. I-5 Filtration Principle of Activated Sludge
Supporting panel
Permeated Water
Nozzle
Membrane 1.6 m
0.5
m
Air
Element
Supporting
panel Membrane
Permeated
water
Activated sludge particle
Membrane
Air

AIRE-064-1-6
4
(2) Membrane Structure
The flat sheet membrane consists of PVDF (Polyvinylidene Fluoride) functional layer and the
base layer of PET (polyester) non-woven fabric. This structure gives the membrane superior
physical strength and high chemical resistance.
(3) Membrane Pore Size
Numerous small-size pores are distributed evenly over the membrane surface with a sharp
pore-size distribution. This structure gives an outstanding high treated water quality and an
excellent water permeability, making the membrane highly resistant to clogging (see Fig.I-6
and Fig.I-7) compared to other membranes. The average pore size is 0.08 micron meter.
Fig. I-6 Membrane Surface (photo)
Fig. I-7 Pore Size Distribution
Other Membrane Toray PVDF Membrane
Pore Size (micron)
東レ
BF014
クボタ
0
0.5
1.0
1.5
0.2 0.4 0.6 0.8
PVDF
Membrane
東レ
BF014
クボタ
0
Number of pore (10
12/m2)
Toray PVDF Membrane
3.0 micron 3.0 micron
Oth
er Membrane

AIRE-064-1-6
5
II. FOR SAFE OPERATION OF “TMR140 SERIES”
Before using “TMR140 Series”, please thoroughly read this Instruction Manual and follow the
instructions described in this manual, especially the safety precautions shown below. The
details of each precaution are described in the relevant chapter
1. Unpacking and Installation
When lifting “TMR140 Series” or its part, please attach chains or
slings to it and raise it straight upward calmly to prevent it from
shaking. Please never allow any person under lifted article.
Please use chains or slings compatible with lifting weight when
lifting "TMR140 Series" or its part.
Check the condition of each part before lifting and never use
damaged one. Never stand below the membrane module when
lifting. Be careful of the balance of the module when lifting.
When lifting TMR140-200D or 400DW, do not lift upper element
blocks and lower element blocks all together. Upper/lower element
block has to be lifted separately.
When installing “TMR140 Series” module, please set up a foothold
in advance. Never climb the module. Please use protective
equipment to ensure the safety of workers.
At transportation, storage and installation, please take appropriate
measures to protect "TMR140 Series" or its part from damage.
Please don't put any heavy objects on the module. Please take
care to protect the module from collision with other objects.
Please do not leave "TMR140 Series" for hours in the place where
the temperature is higher than 40 degree C or in the place exposed
to direct sunlight. Especially ABS supporting panel may be
deteriorated with direct sunlight, ultraviolet ray.
Please take adequate measures to protect “TMR140 Series” from
sparks caused by welding, fusion cutting or grinding throughout the
entire process from installation work to operation startup.
Please protect “TMR140 Series” from freezing at any time.
Please don't pressurize the permeate side of "TMR140 Series”.
DANGER
!
DANGER
!
DANGER
!
CAUTION
!
CAUTION
!
CAUTION
!
CAUTION
!
CAUTION
!
DANGER
!
DANGER
!

AIRE-064-1-6
6
Please install the screen with openings of 3.0 mm or under before
the membrane submerged tank. It is recommended to use the
mesh type screen. Overflow or waste carryover must be avoided at
any time.
2. Operation and Maintenance
Don't use permeated water for drinking.
Before discharging the treated water to the environment or reusing
it, make sure to analyze its quality and confirm that the water
quality meets the intended purpose.
Don't burn the membranes without appropriate facilities since
harmful Hydrogen fluoride (HF) gas is generated
at burning.
When dispose membranes, please apply a service of a qualified
waste disposing company.
When the clean water operation, charging clean water to the
membrane submerged tank with the air discharge valve open to
release air from the elements. After charging water, close the air
discharge valve.
Don’t use the ground water, which contains considerable amount
of iron, manganese, calcium or silica, for the clean water operation
as it may cause the clogging of the membrane.
Don't continue the clean water operation unnecessarily.
A long-time filtration of clean water tends to cause the clogging.
Once the membrane gets wet, keep it wet. If the wet membrane is
dried up again, the permeability of the membrane might be
decreased seriously.
When feeding the seeding sludge, be sure to remove foreign
substances from it with the screen (with openings of 5mm or
under).
Don't do the filtration operation without supplying the scouring air in
a right way, or the membrane will be clogged severely.
Don't put in the activated sludge liquid chemicals, toxic agents, oils
or other substances that may adversely affect activated sludge.
ABS supporting panel may get chemical cracks by some organic
solvent, such as alcohols and oils, and some synthetic detergents. So
don't make ABS panel contact such materials.
Please avoid abrupt changes of operating conditions, especially
pH, temperature and the suction pressure of the membrane even
within the range of the standard operating conditions (Table VII-1).
WARNING
!
WARNING
!
WARNING
!
CAUTION
!
CAUTION
!
CAUTION
!
CAUTION
!
CAUTION
!
CAUTION
!
CAUTION
!
CAUTION
!
CAUTION
!
CAUTION
!

AIRE-064-1-6
7
Please replace the renewal parts periodically or when the
deterioration is detected at the inspection.
Prevent “TMR140 Series” from freezing at any time.
Please take care not to dry the membranes when taking "TMR140
Series" out of the liquid for the inspection or the maintenance. If
the wet membrane is dried up again, the permeability of the
membrane might be decreased seriously.
Please stop the scouring air when the filtration operation stops
except for the following conditions:
1) In case of applying intermittent filtration, do not stop the
scouring air for each relaxation period.
2) In case that the plant operation stops for a while, aeration is
applicable for mixing or aeration demand, however, the flow rate
should be controlled minimal.
Please don’t re-use the old permeate tubes once disconnected
from the nozzles since the connection tightness of the tubes are
reduced.
3. Chemical Cleaning of Element
The chemical agents used for the chemical cleaning are harmful to
the health. When handling chemicals, please read their material
safety data sheet (MSDS) in advance and make sure to wear
necessary protectors such as protective goggles and protective
gloves.
If the chemical agents stick to your skin or clothes, immediately
wash it away with enough amount of running water.
If the chemical agents enter your eyes, immediately wash it away
with enough amount of running water and see the doctor.
If any abnormality is found in the equipment during chemical
cleaning, immediately stop operation and check it.
If chemical is injected forcibly directly with the chemical feed pump
or by any other means, the internal pressure of the elements will
increase and the elements will get damaged. Be sure to inject
chemical with the pressure of lower than 10 kPa (100 mbar).
WARNING
!
WARNING
!
WARNING
!
WARNING
!
CAUTION
!
CAUTION
!
CAUTION
!
CAUTION
!
CAUTION
!
WARNING
!

AIRE-064-1-6
8
When injecting the chemical agents at the chemical cleaning,
please confirm beforehand that the modules are completely
submerged in the liquid and the liquid level of the membrane
submerged tank is higher by more than 500 mm than the top of the
module.
Please store the chemical agents in a dark cold place free from
direct sunlight.
Please use the appropriate tank or the container, for storing the
chemical agent, made of the material having enough corrosion
resistance to each chemical agent.
Don't mix sodium hypochlorite with heavy metals or acids. In
particular, toxic chlorine gas is generated when mixing sodium
hypochlorite and acids.
Don't mix sodium hypochlorite with oxalic acid or citric acid, or toxic
chlorine gas is generated.
Please stop the scouring air during the chemical cleaning, or the
membrane elements might be damaged.
WARNING
!
WARNING
!
WARNING
!
WARNING
!
CAUTION
!
WARNING
!

AIRE-064-1-6
9
III. SPECIFICATIONS AND PERFORMANCE OF “TMR140 SERIES”
1. Specifications of Element
TableIII-1 and Fig.III-1 shows the specifications and the appearance of the element for
TMR140 Series, respectively.
Table III-1 Specifications of Element (TSP-50150)
Model name TSP-50150
Membrane configuration Flat sheet
Application Filtration of activated sludge
Filtration method Suction filtration
Nominal pore diameter ( m) 0.08
Effective membrane area (m
2
) 1.4
Dimensions (mm) Total width 515
Total height 1,608
Thickness 13.5
Weight (kg) Dry 4.8
Wet (Reference) 8.0
Main material Membrane PVDF and PET non-woven fiber
Supporting panel ABS resin
515 mm Permeated water nozzle
50 mm
1608 mm
Fig.III-1 Appearance of Element
2. Specifications of Polyurethane Permeate Tube
Table III-2 shows the specifications of Tube.
Table III-2 Specifications of Polyurethane Permeate Tube
Material Thermoplastic polyether-polyurethane
TPU-ARET*1
Inside diameter / outside diameter / total length (mm) 8/11/380
*Allowable temperature limit: 60 degree C
*1 The material name due to the ISO-18064.

AIRE-064-1-6
10
3. Specifications and Performance of “TMR140 Series” Module
Table III-3 shows the specifications of “TMR140 Series” modules.
Table III-3 Specifications of Module
Model name TMR140-
050S
TMR140-
100S
TMR140-
200W
TMR140-
200D
TMR140-
400DW
Number of membrane elements 50 100 200 200 400
Element block (EBL) structure 1 EBL 1 EBL 2 EBLs
jointed
Double Deck
with 2 EBLs
4 EBLs (2x2)
Dimensions*1
Width (mm) 810 810 840 810 840
Length (mm) 950 1,620 3,260 1,620 3,260
Height (mm) 2,100 2,100 2,100 4,160 4,160
Weight (kg)
Module (dry) 400 695 1,430 1,365 2,710
Aeration block (dry) 40 65 150 65 150
Element block (dry) 360 630 1,280 1,300 2,560
Element block
(sludge clogging)*2 690 1,240 2,480 2,500 4,980
Material
Frame 304 stainless steel
(316LSS is available as option)
Diffuser, Permeated water
manifold
304 stainless steel
(316LSS or Polypropylene *7 is available as option)
Element fixing gaskets EPDM rubber
Connection
flange*3
Manifold ANSI
1 1/2 inch
ANSI
2 inch
ANSI
3 inch
ANSI
2 inch
ANSI
3 inch
Air diffuser ANSI
1 1/4 inch
ANSI
1 1/2 inch
ANSI
2 inch
ANSI
1 1/2 inch
ANSI
2 inch
Operating
range
Temperature 5-40 degree C
pH
*4
of liquid 5-10
MLSS Not higher than 18,000 mg/L
Trans-membrane pressure Not higher than 20 kPa (200 mbar)
Cleaning chemicals feed
pressure Not higher than 10 kPa (100 mbar)
Cleaning chemicals and
chemicals concentration
Sodium hypochlorite (effective chlorine concentration)
：2,000-6,000 mg/L(pH is around 12)
Oxalic acid ：0.5-1.0wt％
Citric acid ：1.0-3.0wt％
Scouring Air Flow rate *5
(NL/min/Module) *6 500 - 1,000 1,000 - 2,000
2,000 - 4,000 1,300 - 2,000 2,600 - 4,000
*1 The total dimensions excluding the connection tube
*2 The weight assumed in the case of sludge clogging between elements.
*3 The flange dimensions are described in the drawings attached to this manual. UNI (ISO) flange is also
available as option.
*4 Except when the chemical cleaning with the designated chemical agents..
*5 The air supply equipment such as blower shall be designed based on the standard operating conditions
shown in Table VII-1.
*6 “NL” means air volume as being 0 degree C and 101.325 kPa (1 atm).
*7 Please contact Toray if you would like to use Polypropylene diffuser/permeated water manifold. Additional
information will be provided.

AIRE-064-1-6
11
Table III-4 and III-5 shows the performance of ”TMR140 Series” modules.
Table III-4 Permeate water quality
Model name TMR140-
050S
TMR140-
100S
TMR140-
200W
TMR140-
200D
TMR140-
400DW
Permeate
water
quality*1
TSS (mg/L) *2 Not higher than 3.0
Turbidity (NTU) *3 Not higher than 1.0
*1 This value can be attained when operated under the standard operating conditions as specified in this
Instruction Manual during a period specified separately by Toray.
*2 Measuring method of TSS is complied with Standard Method of Examination of Water and Wastewater
20th Edition (1998), Section 2540D, Total Suspended Solids Dried at 103-105 degree C or ISO 11923.
*3 Measuring method of NTU is complied with Standard Method of Examination of Water and Wastewater
20th Edition (1998), Section 2130, Turbidity or ISO 7027.
Table III-5 Flow capacity (Reference value)
Model name TMR140-
050S
TMR140-
100S
TMR140-
200W
TMR140-
200D
TMR140-
400DW
Continuous
Filtration
Flow (m3/d)
Sewage 8 - 53 15 - 105 30 - 210 30 - 210 60 - 420
Industrial wastewater 8 - 35 15 - 70 30 - 140 30 - 140 60 - 280
*4 This value is just a reference value and not a guarantee value of Toray. Sustainable operating filtration
flow capacity varies among the plant depending on the type of wastewater, total process design and
operating condition. In case of industrial wastewater application, it is strongly recommended to conduct
a pilot test before membrane tank designing.

AIRE-064-1-6
12
IV. MEMBRANE FILTRATION PROCESS DESIGN FOR “TMR140 SERIES”
The standard filtration pattern time chart, the schematic flow diagram of the membrane
filtration, the layout of “TMR140 Series” modules in the membrane submerged tank, and the
piping procedures are described in this section. These would help you design the membrane
filtration process with “TMR140 Series”.
1. Standard Time Chart
Two kinds of the filtration patterns are available with "TMR140 Series". Usually intermittent
filtration (filtration with relaxation) is adopted and details are shown below, whereas
sometimes simple continuous filtration can also be applied. In both cases aeration shall be
done continuously while filtrating.
In the case of the intermittent filtration, the filtration is suspended (“relaxed”) for a short
period at certain intervals while the air scouring continues, as shown in Fig.IV-1. While the
filtration is suspended, the membrane surface is cleaned up more effectively with the
scouring air due to the absence of suction. Although the automatic system control for
periodical start and stop of the filtration is required, the intermittent filtration is recommended
for stable and efficient membrane filtration. The recommended time cycle for the intermittent
filtration is 9-minute filtration and 1-minute relaxation.
Please stop the scouring air when the filtration operation stops except for the following
conditions:
1) Each relaxation period in case of applying intermittent filtration.
2) In case that the plant operation stops for a while, aeration is applicable for mixing or
aeration demand, however, the flow rate should be controlled minimal.
Fig.IV-1 Recommended Time Chart for Intermittent Filtration
Filtration
Air diffusion
Continuous
Filtration: 9 min.
Relaxation: 1 min.
Cycle of 10 minutes
F1: Average flow rate for treatment capacity
and membrane area calculation
F2: Filtration flow rate for suction pump
capacity calculation
F1
F2

AIRE-064-1-6
13
Membrane Module
FIC
FI
L
H
L:CLOSE
H:OPEN
L:OPEN
H:CLOSE
Permeate water outlet
Manifold
Lower Limit alarm
Air Outlet
Feed
Chemical
Air
D
iffuser
Membrane
Submerged
Tank
PIA
PIA
“U-shape”
2. Flow Diagram of Membrane Filtration
Two schematic flow diagrams of the membrane filtration process are shown below. One is for
the gravity filtration with water head difference and the other is with suction pump. Major
necessary peripheral devices for membrane filtration process are described in the latter part
of this section.
In any case, the fine screen with openings of 3.0 mm or under should be installed before the
membrane submerged tank, or the modules might be polluted and clogged severely with
trashes brought with the raw water.
It is also recommended to prepare enough capacity of the buffer tank (flow equalization tank)
prior to the MBR process to equalize BOD load and filtration flow capacity so as to enable
stable operation of the biological treatment and membrane filtration process.
(1) Gravity filtration configuration
The filtration can be performed with using a natural water head differential pressure
generated from a vertical distance between the liquid level of the membrane submerged
tank and the level of the permeate water outlet (see Fig. IV-2).
Fig. IV-2 Schematic Flow Diagram for Gravity Filtration
In order to obtain enough suction pressure for the filtration considering the friction loss of
pipe and valves, the permeate water outlet should be located sufficiently below the liquid
LS
Wastewater
Fine Screen
FIC: Flow Rate Indicator/Controller
LS : Level Switch
PIA: Pressure Indicator/Alarm
FI : Flow Meter

AIRE-064-1-6
14
level of the membrane submerged tank (normally 3 m below water level or lower).
It is recommended that the piping from the permeate water manifold to the permeate water
outlet should directly penetrate the tank wall, as shown in Fig.IV-2. Also if the permeate
water outlet is located in the open air, it is recommended to make the outlet pipe U-shape to
seal the piping with water.
The permeate water flow is controlled with the automatic control valve (the permeate control
valve). When the liquid level of the membrane submerged tank gets to the lower limit, this
control valve fully closes the permeate water line to stop the filtration. When the liquid level
gets to the higher limit, the automatic shutter valve on the raw water feed line closes its line
to stop raw water coming.
In this gravity filtration, the air accumulated in the permeate water line should be discharged once
a day at least; otherwise the effective water head is reduced seriously. The air purge nozzle
should be installed at the highest position of the permeate water line and the automatic shutter
valve (the air purge valve) is recommended to be installed on the line just before the nozzle. (As
shown in Fig.IV-2) Stopping the filtration (fully closing the permeate control valve) and opening
the air purge valve for a few minutes, the air is easily purged.

AIRE-064-1-6
15
Membrane Module
Air diffuser
FIC
Permeate water
Manifold
PIA
Lower limit alarm
Air outlet
Feed
chemical
FI
L
H
L:OPEN
H:CLOSE
L:CLOSE
H:OPEN
VFD or auto valve
PIA
(2) Pump suction configuration
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

AIRE-064-1-6
16
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 “TMR140 Series” modules simultaneously in one train, it is
advised to install one flow rate controller for one train of the modules.
c. Differential pressure measurement & calculation
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 “TMR140 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

AIRE-064-1-6
17
a = 1,000 mm (= 10 kPa, 100 mbar), b = 3,000 mm (= 30 kPa, 300 mbar)
PIA readings;
Filtration (pump ON) Relaxation (pump OFF)
P1 (kPa) 29 30
P2 (kPa) -15 -10
In this case, differential pressure (dP) is calculated as follows;
dP= (P1Filtration - P1Relaxation) - (P2Filtration - P2Relaxation)= (29) - (30) - [(-15)-(-10)]= 4 kPa
d. Air supply unit (such as a blower)
This unit supplies air to the air diffusers of "TMR140 Series" module. The air flow
rate supplied to the module should be always within the range of "Scouring Air Flow
Rate" indicated in Table III-3.
e. Air flow meter.
An air flow meter is recommended to be installed to check the flow rate of the
scouring air supplied to the module. In case of operating a number of “TMR140
Series” modules simultaneously in a train, it is advised to install at least one air flow
meter for each train.
f. Suction pump
A suction pump is required in the case of pump suction configuration. Accurate flow
rate control is needed for the suction pump with VFD control. The use of a volute
pump (centrifugal pump) or volumetric pump (screw pump) with self-priming function
is recommended.
g. Level sensor
Level sensor is necessary to be installed in the membrane submerged tank to
monitor and control the liquid level of the membrane tank and to calculate the TMP
in PLC.
h. Siphon breaking piping
In case of pump suction, filtration flow may not be stopped by stopping suction
pump if the discharge point of the permeate water is lower than water level of the
membrane submerged basin. This siphon flow has to be avoided and permeate flow
has to be stopped whenever pump stops.
Please install the screen with openings of 3.0 mm or under before
the membrane submerged tank. It is recommended to use the mesh
type screen. Overflow or waste carryover must be avoided at any
time.
CAUTION
!