GE P&W Spiral Wound Membranes - DL Series User Manual
Dl series, Industrial high flow nanofiltration elements, Fact sheet
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FS1248EN.doc Nov-13
Fact Sheet
DL Series
Industrial High Flow Nanofiltration Elements
The D-Series family of proprietary thin-film nanofil-
tration membrane elements is characterized by an
approximate molecular weight cut-off of 150-300
Dalton for uncharged organic molecules. Divalent
and multivalent anions are preferentially rejected
by the membrane while monovalent ion rejection is
dependent upon feed concentration and composi-
tion. Since monovalent ions pass through the mem-
brane, they do not contribute to the osmotic
pressure thus enabling D-Series nanofiltration
membrane systems to operate at feed pressures
below those of RO systems.
Among other applications DL High Flow NF Ele-
ments are used for dye removal/concentration, so-
dium chloride diafiltration and metals recovery.
Table 1: Element Specification
Membrane
D-Series, Thin-Film Membrane (TFM*)
Model
Average permeate flow
GPD (m
3
/day)
1,2
Minimum MgSO
4
rejection
1,2
DL2540C50
430 (1.6)
96 %
DL2540F30
650 (2.5)
96 %
DL2540F50
450 (1.7)
96 %
DL4040C30
2,400 (9.0)
96 %
DL4040C50
1,600 (6.0)
96 %
DL4040F30
2,200 (8.3)
96 %
DL4040F50
1,500 (5.7)
96 %
DL8040C30
9,100 (34.4)
96 %
DL8040C50
6,300 (23.9)
96 %
DL8040F30
8,800 (33.3)
96 %
DL8040F50
6,300 (23.9)
96 %
1
Average salt rejection after 24 hours operation.
Individual flow rate may vary ±25%.
2
Testing conditions: 2,000ppm MgSO
4
solution at 110psi (760kPa) operating
pressure, 77 °F (25°C), 15 % recovery.
Model
Spacer
mil (mm)
Active area
ft
2
(m
2
)
Outer wrap
Part
number
DL2540C50
50 (1.27)
18 (1.7)
Cage
1207015
DL2540F30
30 (0.76)
27 (2.5)
Fiberglass
1207018
DL2540F50
50 (1.27)
18 (1.7)
Fiberglass
1207019
DL4040C30
30 (0.76)
102 (9.4)
Cage
1207030
DL4040C50
50 (1.27)
66 (6.1)
Cage
1207028
DL4040F30
30 (0.76)
91 (8.5)
Fiberglass
3050068
DL4040F50
50 (1.27)
66 (6.1)
Fiberglass
3050067
DL8040C30
30 (0.76)
380 (35.3)
Cage
1207040
DL8040C50
50 (1.27)
261 (24.2)
Cage
1207041
DL8040F30
30 (0.76)
366 (34.0)
Fiberglass
1207048
DL8040F50
50 (1.27)
264 (24.5)
Fiberglass
1207049
Figure 1: Element Dimensions Diagram – Female
Figure 2: Element Dimensions Diagram – Male