Innovative Free Chlorine Resistant Hollow Fiber Nanofiltration Membrane

Technology Overview

Many contaminants such as heavy metals may exist in the water sources. Currently, reverse osmosis (RO) or nanofiltration (NF) systems employing spiral wound modules are used for clean drinking water production. Spacers are required in such modules which create dead zones and are susceptive to the fouling by the bacteria, organic matters and minerals in the feed water.

The technology provider has developed an innovative manufacturing process which allows them to produce hollow fiber NF membranes with good control of the membrane surface charges and physicochemical properties. The platform technology allows for production of highly customized and application specific membranes.

The innovative hollow fiber (HF) nanofiltration membrane that was developed by the technology provider allows for backwash and flush available membrane to minimize the fouling impact to the water treatment process. The membrane is highly resistant to acids, alkali, free-chlorine which allows for chlorine usage to reduce microbial fouling and restoration to optimal membrane performance. The HF nanofiltration membrane can be used under the same working conditions as ultrafiltration (UF) membrane with no pre-treatment process which will lower investment cost.

The technology provider has strong capabilities in membrane design, manufacturing scaling up and membrane operations expertise. They are seeking partners to further develop and commercialise their membrane technologies for a wide range of applications.

Technology Features & Specifications

  • Membrane dimension:  0D0.85 X 1D 0.55
  • Pure water flux (LMH/bar): 12.6±0.3
  • 2000ppm MgSO2: 91.5±0.3%
  • Max. operation pressure: 5.0 bar
  • Feed water turbidity: < 100 NTU
  • Free-chlorine concentration: < 1000 ppm
  • Max. operation temperature: <90°C

Potential Applications

Production of drinking Water:

  • Produce drinking water using brackish water
  • Replace RO cartridge for household drinking water device
  • Recycle for drinking using municipal wastewater
  • Replace UF for seawater desalination pre-treatment

Wastewater Treatment:

  • Textile wastewater treatment and recycle
  • Electroplating wastewater treatment and recycle
  • Other industrial wastewater treatment

Market Trends and Opportunities

It can replace RO systems used in existing household drinking water device and replace UF membranes for seawater desalination pre-treatment.

Customer Benefits

This innovative HF nanofiltration system will save large amount of investment in fixed assets compared with flatsheet (FS) nanofiltration membrane system and shorten investment return period. As there are no strict requirements on feed water quality, the UF pre-treatment system and UV sterilization system which are required for the RO systems can be eliminated. This will largely reduce equipment investment (CAPEX) and operating cost (OPEX).

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