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Nanofiltration Plant (Spiral Wound Membranes)

Nanofiltration (NF) offer a range of possibilities for
concentration and demineralization of different dairy

Nanofiltration Plant (Spiral Wound Membranes)

Highlights and application:
Nanofiltration (NF) offer a range of possibilities for
concentration and demineralization of different dairy
products. The NF SW system is characterized by:
-Ideal solution for product concentration, desalination
and removal of water
-Low plant investment
-Low space requirements
-Easy membrane change
-Sanitary design
The SW membrane is a unique design, where a large
membrane area is wound into a compact element. SW
elements are available with:
-Various diameters (3.8-8 inches)
-Various lengths (38-40 inches)
-Various feed spacers (20-50 mil)
-Special design for high pH/high temperature CIP
-Various salt rejection and lactose rejection (NF)
A number of membrane elements are fitted into a
stainless steel housing to form a module, and a number
of modules are built into a plant. Based on proven,
modular components, each plant is customized to fit the individual applica¬tion. Further, the plant
design allows for access to maintenance of all
vital parts as well as for future cost effective plant
modifications. NF plants with SW membrane
elements can be supplied with any type of process
auto¬mation ranging from a simple, manual to a
fully automatic system, integrated in the overall
factory control system.
Typical applications of NF system are as follows:
-Demineralization and concentration of milk,
whey and UF permeate
Nanofiltration Plant (Spiral Wound Membranes)
Click to see 3D view

HMI Schematic Diagram

Nanofiltration Plant HMI Schematic Diagram

Simplified Flowdiagram

Nanofiltration Plant Simplified Flowdiagram


The required utilities for running the NF plant are as follows:

-Power supply: 3x400 V AC, 50 Hz
(Other voltage and frequencies are also available upon request)
-Cooling water supply: 2-3 bar(g) @ 10-50 C
-Ice water supply: 2-3 bar(g)@1-2 C
-Shaft seal water supply: 2-3 bar(g) @ 10-50 C
-Steam pressure: 2-3 bar(g)
-Air supply: 6 bar (g) Instrument air, free from oil


The NF plant is designed fully automatic and from HMI all of the operation parameters and program sequences can be controlled and monitored. Also, all of the necessary process alarms are already incorporated into the program. The operation presence is only required during operation as surveillance The following process sequences are realized automatically:
-Start up/ Recirculation/Ready for product
-Pre concentration
-Re circulation of product
-Cleaning in place (CIP)


NF plant can include the following options:
-Automatic CIP dosing unit
-Refractometer for online measurement/control of final product brix
-In line cartridge filters for soft water input
-In line filter for product with 10 micron filter
-Mix proof product manifold valve on feed, retentate and permeate inlet/outlet
-Conductivity transmitter for CIP dosing
-Automatic shut off (Isolation) of each loop to cut
water consumption during CIP
-Flush water seal re circulation system. Reducing
water circulation
-Dia filtration system to enable reaching a higher
degree of demineralization
-UPS (Uninterrupted Power Supply)
-Air cooler for Control Pane


NF Plant usually includes the following components:
-Closed balance tank including level transmitter and CIP device
- Valve manifold including set of change over valves and automatic butterfly valves
- Feed pressure system including feed pumps, flow transmitter
and in line filter
-NF Modules and filters
- Re circulation loops each including circulation pump, tubular
heat exchanger, pressure and temperature transmitters, flow
indictors and sampling device
-Retentate/Permeate system including modulating valves,
flow transmitter, permeate pump
-Equipment for flush water including shut off valves and
adjustment valves
-Equipment for steam and cooling water including shut off
valves and non-return valves
-Set of pipes and fittings
-Set of shut off valves for water balance tank
-Set of instruments such as temperature and pressure
-Stainless steel control panel including PLC, HMI, power supply,
solenoid valves, motor starters, MCC etc.
-All of the NF plants are tested in our factory before delivery
-The NF Plant Panel/Programme ensures the following are
1-Automatic temperature control in the loops
2-Automatioctotal solid ration control in the final retentate
3-Recording feed and retetnate flow and each loop
temperature as long as long as the memory of HMI allows it


Standard NF Plants with fixed capacities which are
manufactured by this company are as follows:
-Whey and UF Permeate Demineralization :
5000-30000 Lit/hr
Higher capacities are available based upon request and can be tailor made.