All About Nanofiltration and What Is It

 

INTRODUCTION TO NANOFILTRATION

 

The natural surface water, especially waters that are available through rivers, is the main source of healthy water for the living beings throughout the world from ancient days as it consists of all essential minerals. With industrialization and globalization taking over every part of the world, gradually even the most prominent rivers have been polluted in all parts of the world. Although there are lots of technologies to filter and clean our water, nanofiltration (NF) has been chosen to transform river water into healthy water due to its unique advantages of retaining optimum TDS (with essential minerals required for human body), consuming of lower energy, and no usage of any chemicals. The prominent parameters of surface water and macro/microminerals of treated water have been analyzed. It is shown that NF is better in producing healthy water with high flux by consuming low energy. (Journal of Chemistry Volume 2015, Article ID 326869)

 

WHAT IS NANOFILTRATION WATER TREATMENT

AND HOW DOES IT WORK?

 

While RO and NF are both membrane technologies that uses a semipermeable medium to remove certain ions and particles from a liquid stream, they can be distinguished based on the size of particulates that each is able to remove. The primary difference is that in a nanofiltration system the membrane is not as 'tightly' rolled as in an RO system. Comparatively, RO and NF are capable of removing finer contaminants than microfiltration and ultrafiltration, with applications including the removal of:

 

  • hardness
  • heavy metals
  • nitrates
  • organic macromolecules
  • radionuclides
  • sulfates
  • total dissolved solids (TDS)

 

Nanofiltration, however, delivers slightly coarser filtration than RO, with the ability to remove particles as small as 0.001 to 0.0001 μm in diameter, including pesticide compounds and organic macromolecules, while retaining minerals that RO would otherwise remove. Nanofiltration membranes are capable of removing larger divalent ions such as calcium sulfate, while allowing smaller monovalent ions such as sodium chloride to pass through.

 

Because of its filtration properties and abilities to remove trivalent ions nanofiltration is often used to:

 

  • concentrate and demineralize valuable byproducts, such as metals from wastewater
  • generate potable drinking water
  • remove nitrates
  • remove pesticides from ground or surface water
  • soften water

 

 

BENEFITS OF NANOFILTRATION

 

- 500% lower discharge and waste water than typical reverse osmosis systems
- Removal of heavy metals
- Reduction of water hardness/TDS+
- Removal of bacteria, VOC’s, viral contaminants, and pesticides
- Reduction of nitrates and sulfides
- Reduction of salt content (brackish water)
- Chemical-free filtration
- Ideal for municipal water supply, well water, river and rain water
- Removes iron, lime and other problem causing chemicals often neglected by water softeners

 

                        

 

OVER 99% REMOVED: 
Bacteria, Viruses, Mold, Spores, Fungus, Crytosporidium, Giardia Lambia, Parasites. 

OVER 90% REMOVED:
Barium, Bicarbonate, Bromine, Chloride, Chlorine, Chloramine, Chromium, Copper, Cyanide, Fluoride,(80%, can be increased to 98%) Manganese, Mercury, Nickel, Silver, Turbidity and more. 

OVER 85% REMOVED:
Aluminum, Cadmium, Carbon Tetrachloride, Lead, Nitrate, Organics, Pesticides, Radium, Silica, SOC’s, Sodium, Strontium, THM’s, TOC, and Uranium. VOC’s 75% and more. 

OVER 85% REMOVED:
Arsenic, Benzene, Borate, Calcium and Selenium. Water Hardness / TDS and more...

 

Hydrologics HERO