The flexible PVDF flat membrane is suitable for MBR and immersion ultrafiltration. The non-stick property (low surface energy) of PVDF gives it better pollution resistance and stable flux. The Flexible flat membranes are a new series of mainstream MBR membrane products.
The flexible flat membrane module retains the similar advantages of conventional flat membrane, which are high strength, easy maintenance, no backwashing, large flux, and low transmembrane pressure difference. Furthermore, has the high packing density property of hollow fiber membranes, flexible and requires small footprint area. The membrane has waving ability from bubble that release at the bottom of module.
The unique advantages of membrane are low replacement cost, high welding strength, and can backwashing.
Key Advantage
The flexible flat membrane stack consists of a rectangular diaphragm membrane size 250 mm × 250 mm, a sealing ring, a spacer ring, a central water collection pipe, and two side baffles plate. The rectangular diaphragm membrane, sealing ring, etc. are threaded on the central water collection pipe in turn, and then compressed and sealed by the two side baffles.
FLEXIBLE FLAT MEMBRANE STACK MODEL |
FM-4 |
FM-8 |
FM-9 |
Membrane size (mm) |
250*250 |
250*250 |
250*250 |
Membrane spacing (mm) |
4 |
8 |
8 |
The average thickness of the membrane (mm) |
0.7 |
0.7 |
0.7 |
Number of the membrane (pieces) |
182 |
114 |
208 |
Membrane surface area (m2) |
20 |
12.5 |
23 |
Membrane stack size (mm) |
528*520*252 |
528*520*252 |
528*920*252 |
Membrane material |
PVDF |
PVDF |
PVDF |
Number of outlet pipes |
2 |
2 |
2 |
Flow L/h |
200-600 |
125-375 |
230-690 |
Working differential pressure |
0.2-6 |
0.2-4 |
0.2-4 |
Main application points |
UF |
MBR |
MBR |
membrane size (mm) |
250*250 |
Average membrane thickness (mm) |
<1.0 |
Single membrane area (m2) |
0.11 |
membrane material |
PVDF |
Internal support layer material of the membrane |
PET+PP |
Membrane aperture (μm) |
0.03-0.1 |
Number of outlet pipes |
2 |
Welding strength (N) |
≥ 500 |
trong>ITEM |
FLEXIBLE FLAT MEMBRANE |
HOLLOW FIBER MEMBRANE |
TRADITIONAL FLAT MEMBRANE |
LMH |
10-30 |
10-20 |
10-30 |
Filling density |
Same |
Same |
Small |
Air volume |
Same |
Same |
Larger |
Backwash |
Not Required (Add if necessary) |
Required |
Not Allowed |
Swing |
Yes |
Yes |
No |
Filament broken |
No |
Yes |
No |
Expected service life |
Long |
Short |
Long |
Requirements for pre filtration (grid diameter) |
2 mm |
1 mm |
2 mm |
Offline cleaning |
Low |
High |
Low |
Transmembrane pressure (-Kpa) |
1-30 |
10-60 |
8-30 |
Investment cost / operating cost |
Low / Low |
Low / High |
High/ High |