Hollow Fiber Nanofiltration Membranes for Heavy Metal Removal

Technology Overview

Heavy metals are highly toxic contaminants found in industrial wastewater that may find their way into drinking water sources through unregulated discharge from industrial plants. Even at low concentrations, heavy metals can disrupt a human body's normal physiological activities and can accumulate in certain organs causing a range of chronic diseases. As such, heavy metal pollution has drawn attention from regulatory agencies throughout the world that has set increasingly stringent standards to curb heavy metal discharge into water bodies and membrane technology will be able to treat these wastewaters.

This technology relates to nanofiltration (NF) membrane molecularly designed to remove heavy metals such as Zinc, Nickel and Lead at higher rejection rates compared to conventional NF membranes. This is done through functionalizing specialized polymers on a P84 polyimide substrate which provides an extra means to remove heavy metals through adsorption. 

Technology Features & Specifications

  • Negatively charged membrane at neutral pH
  •  >99% rejection pf negatively charged heavy metal ions such as Chromate (Cr2O72-), Arsenic (HAsO42-) and cadmium (CdCl42-).
  • High rejections of organic and positively charged heavy metal salt such as Lead ions (Pb2+).

Potential Applications

Treatment of wastewater containing heavy metals in the following industries:

  • Automotive
  • Battery production 
  • Mining 
  • Textile 

Customer Benefits

  • Small footprint due to hollow fiber configuration    
  • Thermally, chemically and mechanically stable (>20 bar pressure)
  • Excellent rejection to heavy metal ions
  • Low operating cost due to low-pressure filtration



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