GE P&W Dairy DK Series User Manual
Fact Sheet
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FSsmDairyDKSeries_EN.doc Nov-13
Membrane
D-Series, Thin Film Membrane (TFM*)
Model
Spacer
mil (mm)
Active area
ft2 (m2)
Part
number
Dairy DK3838C30
30 (0.76)
79 (7.3)
1227618
Diary DK3840C30
30 (0.76)
84 (7.8)
1206940
Dairy DK3840C50
50 (1.27)
58 (5.4)
1206942
Dairy DK8038C30
30 (0.76)
358 (33.2)
1226591
Dairy DK8038C50
50 (1.27)
275 (25.5)
1206977
Dairy DK8038C65
65 (1.65)
246 (22.8)
1269441
Dairy DK8040C30
30 (0.76)
346 (32.1)
1229937
Dairy DK Series
Dairy Processing Sanitary Nanofiltration
The D-Series family of proprietary thin-film nanofiltration 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 composition. Since monovalent ions pass through the membrane, 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.
The DK membrane has a minimum rejection of 98%
on 2,000 ppm MgSO4 at 25°C (77°F) and 110psi operating pressure.
The Dairy Processing DK Elements are typically used
in food related processes requiring stringent sanitary procedures. Applications include lactose
desalting, deacidification and demineralization of
whey or UF permeate.
These elements feature a Durasan* Cage patented
outer wrap, a selection of feed spacers, and polysulfone parts.
Table 1: Element Specification
Figure 1: Element Dimensions Diagram – 8040
Figure 2: Element Dimensions Diagram – All except
8040
Model1
Dimensions, inches (cm)
Boxed
A
B2
C
Weight
lbs (kg)
Dairy DK3838C
38.00
(96.5)
0.833
(2.12)
3.79
(9.6)
7
(3.2)
Dairy DK3840C
38.75
(98.4)
0.833
(2.12)
3.79
(9.6)
7
(3.2)
Dairy DK8038C
38.00
(96.5)
1.125
(2.89)
7.91
(20.1)
29
(13.2)
Dairy DK8040C
40.00
(101.6)
1.125
(2.86)
7.913
(20.1)
29
(13.2)
Typical Operating Pressure
70-400psi (483-2,757kPa)
Typical Operating Flux
5-20 GFD (8–34 LMH)
Clean Water Flux (CWF)1
14 GFD (24 LMH) @ 110psi
Maximum Operating Pressure
600psi (4,137kPa)
Maximum Permeate Pressure2
60 psi (413 kPa)
Maximum Temperature
122°F (50°C)
pH Range
3.0-9.0
Recommended Pressure Drop
Over an element: 12psi (83kPa)
Maximum Pressure Drop
Over an element: 15psi (103kPa)
Per housing: 60psi (414kPa)
Chlorine Tolerance
500ppm-hours
dechlorination recommended
Temperature
‘pH minimum
‘pH maximum
50°C (122°F)
2.0
11.01
50°C (122°F)
2.0
10.5
45°C (113°F)
2.0
11.0
35°C (95°F)
1.5
11.5
25°C (77°F)
1.0
11.5
Table 2: Dimensions and Weight
1
These elements are dried and bagged before shipping.
2
Internal diameter.
3
The element diameter (dimension C) is designed for optimum performance in GE
Water & Process Technologies pressure vessels. Others pressure vessel dimension
and tolerance may result in excessive bypass and loss of capacity.
Table 3: Operating parameters
Table 4: CIP limits for nanofiltration membranes
1
CIP at pH 11 and 50°C is acceptable for heavily fouled systems. For the optimum
membrane element lifetime, pH 10.5 at 50°C (122°F) is recommended for daily CIP
protocol.
1
Clean water flux (CWF) is the rate of water permeability through the membrane
after cleaning (CIP) at reproducible temperature and pressure. It is important to
monitor CWF after each cleaning cycle to determine if the system is being
cleaned effectively. CWF can vary ±25%.
2
Permeate pressure should never exceed the concentrate pressure.
Page 2 Fact Sheet
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