Naro ® Nanofiltration & Reverse Osmosis

Nanofiltration (NF) is a pressure driven process similar to Reverse Osmosis (RO) applied in the area between Reverse Osmosis and Ultrafiltration.

Monovalent ions and low molecular weight organics are passing through the membrane, while bigger compounds are rejected. Monovalent ions and low molecular weight organics are passing through the membrane, while bigger compounds are rejected.

Molecular weight cut off of a Nanofiltration membrane is in the range 150-500 and typical applications are in pharmaceutical preparations, in food and chemical processes, removal of color and hardness from water.

Hydroair has developed a reverse osmosis system able to concentrate the total dissolved solids to higher levels than the ones reachable with the traditional reverse osmosis systems, with better energy efficiency and optimal membranes performance.

This system is called NARO® system. NARO® system is a multistage system with feed and bleed configuration, i.e. with continuous discharge of the concentrated phase, that with a variable distribution of the operating pressure in the loops gives the following advantages compared with the traditional systems:

• Lower energy consumption
• Best performance of the membranes, in terms of rejection and fluxes
• Investment and operating costs more competitive