Membrane Modules

Duraflow membranes are manufactured in a tubular configuration capable of handling high solid concentration. The membranes, made of PVDF, are cast on the surface of 1" (2.54 cm) diameter porous polymeric tubes to produce a nominal pore size of 0.1 micron. The extraordinary chemical resistant property of PVDF allows the use of a wide range of chemicals – acids, bases and oxidizers for cleaning of the persistent fouling substances.

Technology Innovation

The unique PVDF membrane formulation and revolutionary fabrication technique effectively (1) eliminate all undesired large pores, (2) generate a much larger number of pores per square inch of membrane surface, and (3) strengthen the PVDF anchors in the porous polymeric substrate. The uniform sub-micron pore size feature enables the wastewater to be purified to <1.0 NTU and <3.0 SDI in full compliance with the RO feed water criteria. The increase of porosity explains the ability of the membrane to consistently operate at twice the operating flux of other similar tubular membrane products. The strengthened PVDF anchors produce a highly durable filter material that can extend continuous operation for 5 to 10 years without membrane replacement.
Duraflow Membrane Data Sheet (PDF)

Features and Benefits

  • Uniform pore size produces consistent high filtrate quality
  • High-porosity substrate yields high flux
  • Strong membrane-to-substrate composition extends filter service life
  • Low-fouling tubular configuration provides high-solid tolerance (2-3 wt % TSS)
  • Chemical-resistant PVDF membrane can be cleaned effectively with strong chemicals
  • Extended module train design results in energy cost savings and foot print reduction
DF Module DF-401 DF-404 DF-405 DF-406 DF-415 DF-414 DF-419 DF-424
No. of Tubes 1 4 5 6 10 14 19 24
Membrane Area 1.5 ft2
(0.14 m2)
6 ft2
(0.56 m2)
7.5 ft2
(0.7 m2)
9 ft2
(0.84 m2)
15 ft2
(1.49 m2)
21 ft2
(1.96 m2)
28.5 ft2
(2.65 m2)
36 ft2
(3.36 m2)
Module Diameter 1.5"
(3.81 cm)
4"
(10.16 cm)
4"
(10.16 cm)
5"
(12.70 cm)
6"
(15.24 cm)
6"
(15.24 cm)
8"
(20.32 cm)
8"
(20.32 cm)
Module Length 72"
(1.83 m)
72"
(1.83 m)
72"
(1.83 m)
72"
(1.83 m)
72"
(1.83 m)
72"
(1.83 m)
72"
(1.83 m)
72"
(1.83 m)
Shell Material SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC
End Sealant Epoxy Resin Epoxy Resin Epoxy Resin Epoxy Resin Epoxy Resin Epoxy Resin Epoxy Resin Epoxy Resin
Weight 9 lb
(4.1 kg)
25 lb
(11.35 kg)
26 lb
(11.8 kg)
30 lb
(13.8 kg)
40 lb
(18.2 kg)
45 lb
(20.4 kg)
72 lb
(32.7 kg)
75 lb
(34 kg)
(Note: CPVC, Stainless Steel and HDPE shell materials are available)