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Nanofiltration NF System
Nanofiltration (NF), in water treatment, “bridges” a gap between ultrafiltration and reverse osmosis membranes. It is sometimes 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 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 an RO water treatment system.
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 than 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. 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%.
The popularity of NF systems can also be attributable to its low operating pressures during operation, which helps to save power & energy costs. In comparison to reverse osmosis systems, it does not require as much pretreatment since NF systems contain less sensitive membranes, and are more equipped in rejecting bivalent ions such as calcium, magnesium, uranium and radium. Furthermore, Its molecular weight resides between reverse osmosis and ultrafiltration which improves versatility for different industries.
Nanofiltration NF System Operation Specifications
Max. feed water temperature: 42°C
Feed water pressure: 20 to 50 psi
Operating pressure: 80 to 150 psi
H2S must be removed
Turbidity should be removed
Max. Iron content: 0.05 ppm
Feed water TDS: 0-1,000 ppm
Equipment upgrade for higher TDS
Hardness over 1 GPG requires antiscalant dosing
pH tolerance range: 3-11
Max. Silica Tolerance: 60 ppm @ 60% recovery
Operate at higher TDS by lowering recovery
Commercial Nanofiltration NF System
|
Photo |
Model Number |
Permeate Flow Rate |
Membrane |
||||
|
GPD |
TPD |
LPH |
Size |
Qty. |
|||
|
NF-1500 |
NF-11K-3340 |
11700 |
44 |
1500 |
4040 |
9 |
|
NF-2000 |
NF-13K-5240 |
13500 |
51 |
2000 |
4040 |
10 |
|
|
NF-2500 |
NF-16K-4340 |
16200 |
61 |
2500 |
4040 |
12 |
|
|
NF-3000 |
NF-19K-5340 |
19800 |
75 |
3000 |
4040 |
15 |
|
|
NF-3500 |
NF-21K-8240 |
21600 |
82 |
3500 |
4040 |
16 |
|
|
NF-4000 |
NF-24K-6340 |
24300 |
92 |
4000 |
4040 |
18 |
|
|
NF-4500 |
NF-28K-7340 |
28800 |
109 |
4500 |
4040 |
21 |
|
Industrial Nanofiltration NF System
|
Photo |
Model Number |
Permeate Flow Rate |
Membrane |
||||
|
GPD |
TPD |
LPH |
Size |
Qty. |
|||
|
|
NF-4000 |
NF-25K-1480 |
25200 |
95 |
4000 |
8040 |
4 |
|
NF-5000 |
NF-32K-1580 |
32400 |
123 |
5000 |
8040 |
5 |
|
|
NF-6000 |
NF-38K-1680 |
38700 |
146 |
6000 |
8040 |
6 |
|
|
NF-8000 |
NF-51K-2480 |
51300 |
194 |
8000 |
8040 |
8 |
|
|
NF-10000 |
NF-64K-2580 |
64800 |
245 |
10000 |
8040 |
10 |
|
|
NF-12500 |
NF-78K-3480 |
78300 |
296 |
12500 |
8040 |
12 |
|
|
NF-15000 |
NF-97K-3580 |
97200 |
368 |
15000 |
8040 |
15 |
|
|
NF-17500 |
NF-117K-3680 |
117000 |
443 |
17500 |
8040 |
18 |
|
|
NF-20000 |
NF-129K-4580 |
129600 |
491 |
20000 |
8040 |
20 |
|
|
NF-25000 |
NF-155K-4680 |
155700 |
589 |
25000 |
8040 |
24 |
|
Note: The above information is to be confirmed after providing detailed water analysis. Nanofiltration systems are the same as RO systems, and must have good pretreatment and antiscalant dosing systems.
Applications
|
Salty Wastewater Desalt Dyes Resulting Caustic Cleaning Solution Softened Water Hard Water Agriculture .... |
Whey and Whey Permeate Textile Industry Wastewater Recycle Acid Solutions Reduced Scaling Concentrated Antibiotics Hospitals ... |
Recovery Lactose Whey Protein Concentrate Reduced Salt Content Reduced Cleaning Chemical Cost Potable Water Production Restaurants ... |
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