GE P&W Spiral Wound Membranes - DK Series - Manual

Fact Sheet
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AM-FSpwDKSeires_EN.doc Nov-13
DK Series
Industrial High Rejection 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 DK High Rejection NF El-
ements are used for dye removal/concentration,
sodium chloride diafiltration and metals recovery.
Table 1: Element Specification
Membrane D-Series, Thin-film membrane (TFM*)
Model
Average
permeate flow
gpd (m3/day) 1,2
Minimum MgSO
4
rejection 1,2
DK2540C30 560 (2.1) 98%
DK2540C50 350 (2.3) 98%
DK2540F30 540 (2.0) 98%
DK2540F50 340 (1.3) 98%
DK4040C30 2,000 (7.6) 98%
DK4040C50 1,300 (4.9) 98%
DK4040F30 2,000 (7.6) 98%
DK4040F50 1,300 (4.9) 98%
DK8040C30 6,900 (21.1) 98%
DK8040C50 5,400 (20.4) 98%
DK8040F30 7,800 (30.0) 98%
DK8040F50 5,400 (20.4) 98%
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
DK2540C30 30 (0.76) 28 (2.6) Cage 1206918
DK2540C50 50 (1.27) 18 (1.6) Cage 1206919
DK2540F30 30 (0.76) 28 (2.6) Fiberglass 1206925
DK2540F50 50 (1.27) 18 (1.6) Fiberglass 1206926
DK4040C30 30 (0.76) 98 (9.1) Cage 1206947
DK4040C50 50 (1.27) 65 (6.0) Cage 1206946
DK4040F30 30 (0.76) 98 (9.1) Fiberglass 3050075
DK4040F50 50 (1.27) 65 (6.0) Fiberglass 3050073
DK8040C30 30 (0.76) 347 (32.1) Cage 1206978
DK8040C50 50 (1.27) 270 (25.1) Cage 1206979
DK8040F30 30 (0.76) 390 (36.2) Fiberglass 1206993
DK8040F50 50 (1.27) 272 (25.3) Fiberglass 1206994
Figure 1: Element Dimensions Diagram – Female
Figure 2: Element Dimensions Diagram – Male