An intermediate membrane solution for hardness and colour removal, operating at lower pressure than reverse osmosis.
Nanofiltration offers a selectivity between ultrafiltration and reverse osmosis. It retains multivalent ions (calcium, magnesium, sulfate) to a large extent while letting some of the monovalent ions through.
In applications where the water does not need to be fully demineralised but hardness, colour and organic load do need to come down, it delivers the result with less energy than reverse osmosis.
Suspended solids and chlorine are removed; the most critical stage ahead of the membrane.
A lower operating pressure than RO is sufficient.
Hardness-forming ions, colour and organic matter are retained.
The filtrate goes to the process, the concentrate to discharge or to recovery.
An alternative to resin softening; lower hardness without salt consumption.
Reduction of colour and organic load originating from surface water.
Production lines that do not require full demineralisation.
Lightening the load on a downstream reverse osmosis stage.
All three deal with hardness, but their cost structures differ. Softening brings salt consumption and regeneration waste; RO gives the lowest conductivity but demands the most energy; NF sits between the two.
The right answer depends on the raw water analysis and on the water quality the process genuinely needs. In our efficiency calculations we put these three options side by side and assess them.
We select the most suitable product according to the raw water analysis; a brand change is possible on existing systems.
Because it does not strip the mineral content entirely, it can be preferred for drinking water preparation; the final decision rests on the water analysis and the applicable regulations.
Yes, because it retains multivalent ions there is a risk of precipitation at the membrane surface; the appropriate antiscalant is selected during engineering.
It is. As a first stage NF reduces the load on the RO and can increase the recovery rate.
High-recovery industrial reverse osmosis units for process and boiler feedwater.
View →Resin softeners for hardness removal; resin replacement and regeneration tuning.
View →Complete system delivery with filter face piping, control panel and field installation.
View →Let us size the system together; we will survey the site in person if needed.
