Lenntech
Fact Sheet
info@lenntech.com Tel. +31-152-610-900
www.lenntech.com Fax. +31-152-616-289
Dairy Processing Sanitary
Nanofiltration DK3840C
The D-Series family of proprietary thin-film nanofiltration membrane elements are characterized by
an approximate molecular weight cut-off of
150-300 daltons 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 DK3840C Durasan* Elements are typically used
in food related processes requiring stringent sanitary procedures. Applications include lactose
desalting, deacidification and demineralization of
whey and demineralization of UF permeate.
Figure 1: Element Dimensions Diagram
Table 3: Dimensions and Weight
Dimensions, inches (cm)
Model
Table 1: Element Specification
Spacer
Mil (mm)
Active Area
ft2 (m2)
Part
Number
DK3840C-30D
30 (0.76)
77 (7.15)
1206940
DK3840C-50D
50 (1.27)
58 (5.39)
1206942
Table 2: Pressure Drops
Maximum
Pressure Drop
∆P - psig (kPa)
A
B
C
Weight
lbs (kg)
DK3840C-30D
38.75
(98.43)
0.833
(2.12)
3.79
(9.6)
12
(5.4)
DK3840C-50D
38.75
(98.43)
0.833
(2.12)
3.79
(9.6)
12
(5.4)
Table 4: Operating and Design Parameters
The DK3840C Durasan Elements feature a Durasan
patented outerwrap, a selection of feed spacers,
and polysulfone parts.
Model
Dry Boxed
Membrane
D-Series Thin-film membrane (TFM*)
Typical Operating Pressure
70-400 psig (483-2,757 kPa)
Typical Operating
Process Flux
10-25 GFD (17-42 LMH)
Clean Water Flux (CWF)1
14 GFD (24 LMH) @ 100 psig
Maximum Pressure
600 psig (4,137 kPa)
Maximum Temperature
122°F (50°C)
Recommended pH
Operating Range 3.0-10.0,
Cleaning Range 1.0-11.0
Chlorine Tolerance
500 ppm-hours, dechlorination recommended
2
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%.
Elements per Pressure Vessel
1
2
3
4
5
15 ( 103)
30 (207)
45 (310)
60 (414)
60 (414)
©2006, General Electric Company. All rights reserved.
*Tr a dema r k of Genera l Elec tr ic Compa ny ; ma y be r egis ter ed in one or more c ountr ies .
FS1177EN 0607