De.mem has exclusively licensed a novel low pressure hollow fiber nanofiltration membrane technology from Nanyang Technological University (NTU) in Singapore. The innovation is based on many years of research by the NTU scientists.
De.mem manufactures the new membrane at its production facility in Singapore.
The new membrane technology is based on a proprietary materials formulation. Its surface is positively charged, which ultimately results in better rejection of contaminants that is less dependent on pore size. A loose substrate structure allows for high water permeation.
The De.mem nanofiltration membrane is operated at a comparably low pressure of only approx. 2 bar. This leads to significant savings in power consumption vs. traditional flat-sheet based Nanofiltration or Reverse Osmosis, ultimately resulting in reduced operating cost. The De.mem nanofiltration membrane is a hollow fiber membrane. This also allows for easy and automated cleaning by a simple backwash routine.
The filtration process works as shown in the following chart. Hollow fiber membrane bundles are placed in the inside of so-called membrane modules. The water is then pumped inside these modules. As pressure is applied, clean water passes through the pores of the selective layer of the membrane. The contaminants remain outside. The clean water then leaves the modules. In a regular and simple backflush routine, the dirt is cleaned out of the modules.
Applications for the technology are in both industrial waste water treatment and potable water supply.