Nanofiltration systems by Acmas Technologies Pvt. Ltd.

NANOFILTRATION SYSTEMS

NANOFILTRATION SYSTEMS Nanofiltration membrane's technology is used separate soluble ions from water through a semi permeable membrane. The membrane operates under a different hydraulic profile which is also known cross flow filtration, unlike a dead end filter. Nanofiltration system offers an ideal solution for desalination and other applications. Nanofiltration (NF) in water treatment “bridges” a gap between UF and RO membranes. The membrane system is also referred to as a loose or lower rejecting RO membrane. It could also be called a tight UF, as NF membrane pore size ranges from .01 to a little less than .001. Generally, an NF membrane or system lets more salt pass than an RO membrane. In addition, an NF membrane element will produce the same quantity of product at 50 to 70% the applied pressure as RO. Nanofiltration has also been called a “softening” membrane as while its salt rejection may be 80% or less, hardness rejection will often remain well over 90%. Like RO, and unlike UF, an Nanofiltration Systems will recover a percentage of the feed water. Most all NF membranes are of a spiral wound configuration. It’s estimated that NF membrane element sales are less than 5% of RO sales for the major manufacturers. Most Nanofiltration membranes are composite materials supported by polymer

substrate

and

manufactured in a spiral design as opposed to a flat sheet or tube geometry. The predominant model used today for industrial applications is the spiral configuration. There are applications where a 75% rate

of salt rejection is preferable to 95 to 99%, especially when it is achieved using only half of the energy. Unlike with RO membrane elements, the NF offerings of the major membrane manufacturers are quite different in performance from company to company. With RO membrane elements, any model with less that 99.5% sodium chloride rejection, especially with seawater membranes, is considered inferior. In the case of NF, there is a “place” for any membrane with a NaCl rejection rate of 40%, or more.

Applications of Nanofiltration are Ÿ Nitrates removal Ÿ The removal of heavy metals from wastewater Ÿ The removal of pesticides from groundwater Ÿ Wastewater recycling in laundries Ÿ Water softening

NF Applications Application Whey / Whey

Permeate Salty waste water

Concentrate Desalted whey concentrate

Permeate

Benefits of NF Allows the recovery of lactose and whey protein concentrate with reduced salt content

Textile

Dyes

Water, salts, BOD, COD and

NF is used to desalt

dyes

color

resulting in a higher value product

Caustic cleaning

BOD, COD, suspended solids,

Allows caustic cleaning solution

solutions

solution

caustic cleaner

to be recycled resulting in reduced cleaning chemical costs

Recycle of acid

Acid solution

solutions

BOD,

COD,

calcium,

suspended solids, acidic water

Allows acid solution to be recycled resulting in reduced cleaning chemical costs

Water

Softened water

Hard water

Potable water production. Softened water reduces scaling on equipment and heat exchange surfaces

Antibiotics

Salty waste product

Desalted, concentrated

NF produces high value

Antibiotics

pharmaceutical products

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