EconoPure - LFNano

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EconoPure - LFNano

The LFNano™ comes in several standard systems and multiples of these systems can be run in parallel to achieve larger capacities. 

The LFNano™ systems come in 20 centimeter (8 inch) diameter vessels currently with larger (and smaller diameters available on custom orders).  The standard LFNano™ system come in odd numbers of pressure vessels from 3 to 11 and from 1 to 3 elements tall.  The part number nomenclature is as follows:

LFN-[# vessels]20[elements tall]

So LFN-7202 is seven (7) vessels, each of 20 centimeters in diameter (8 inch) and two elements per vessel.  The following table shows the dimensions and capacity of each standard system as well as the range of capacities from low to high flux applications.

 

 

CAPACITY (m3/d)

Dimensions (meters)

 

LOW Flux

HIGH Flux

Length

Width

Height

LFN-3201

            11

            19

           1.3

           1.2

           1.8

LFN-5201

            18

            32

           1.6

           1.2

           1.8

LFN-7201

            25

            45

           1.9

           1.2

           1.8

LFN-9201

            32

            58

           2.2

           1.2

           1.8

LFN-11201

            40

            71

           2.5

           1.2

           1.8

LFN-3202

            22

            39

           1.3

           1.2

           2.8

LFN-5202

            36

            65

           1.6

           1.2

           2.8

LFN-7202

            50

            90

           1.9

           1.2

           2.8

LFN-9202

            65

          116

           2.2

           1.2

           2.8

LFN-11202

            79

          142

           2.5

           1.2

           2.8

LFN-3203

            32

            58

           1.3

           1.2

           3.8

LFN-5203

            54

            97

           1.6

           1.2

           3.8

LFN-7203

            75

          136

           1.9

           1.2

           3.8

LFN-9203

            97

          175

           2.2

           1.2

           3.8

LFN-11203

          119

          213

           2.5

           1.2

           3.8

 

Membrane Selection

The LFNano™ has six different nanofiltration (NF) membranes from which to choose.  They are described by their rejection of magnesium sulfate (MgSO4) and sodium chloride (NaCl) under certain test conditions.  The range of NF membranes available on the LFNano™ are shown in the table below.

Membrane

% MgSO4 Rejection

% NaCl Rejection

Difference %

EPWS NF6A

99.5

90.0

9.5

EPWS NF5A

99.0

55.0

44.0

EPWS NF4A

98.5

35.0

63.5

EPWS NF3A

99.5

40.0

59.5

EPWS NF2A

99.5

46.0

53.5

EPWS NF1A

85.0

15.0

70.0

 

The test conditions for the standard membrane performance tests rarely approximate real world conditions but are used to give people an indication of a membrane’s performance.  The difference between the rejection of magnesium sulfate and sodium chloride is important because the monovalent ions like sodium and chloride will exert far more osmotic pressure on a membrane system than the polyvalent ions like magnesium and sulfate.  Thus the lower rejection of the monovalent ions is important for a low cost simple system.  As a comparison, most reverse osmosis (RO) membranes reject over 95% monovalent ions and over 99% of polyvalent ions.

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