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

Fact Sheet
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FSsmDairyDKSeries_EN.doc Nov-13
Dairy DK Series
Dairy Processing Sanitary Nanofiltration
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.
The DK membrane has a minimum rejection of 98%
on 2,000 ppm MgSO
4
at 25°C (77°F) and 110psi op-
erating pressure.
The Dairy Processing DK Elements are typically used
in food related processes requiring stringent sani-
tary 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 polysul-
fone parts.
Table 1: Element Specification
Membrane D-Series, Thin Film Membrane (TFM*)
Model
Spacer
mil (mm)
Active area
ft 2 (m 2 )
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
Figure 1: Element Dimensions Diagram – 8040
Figure 2: Element Dimensions Diagram – All except
8040