Design of the Filtration Stage
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Form-No: TM-WW002 // Revision: A // Date: Oct. 10, 17
the top of the UF module(s) and the CIP solution leaves the UF modules via the feed connec-
tion (also at the top of the UF module(s) and returns to the CIP tank.
The total procedure takes several hours and could be executed with soak and circulation inter-
vals repeated several times to enhance the effectiveness of the CIP cleaning. It is advised to
check the pH in the CIP return water in the beginning and add more chemicals if the pH has
deviated from the desired initial value. In the event NaOCl is used for cleaning then during CIP
solution preparation and during checking of the concentration after the CIP circulation has
started can be checked by measuring the free-chlorine content (instead of pH for acid or caus-
tic soda solutions).
Rack Installation
5.3
The modules can be arranged as a fixed unit. This unit is called rack (or skid).
Preparation before rack installation
Clean the entire system, especially piping and hoses in order to avoid a contamination of
the membrane modules.
Check the functionality of the membrane modules after unpacking.
Membrane modules should be installed shortly before start-up is planned in order to avoid
too long storage in the rack after unpacking the membrane modules.
Write down the module serial number and the rack position.
Rack installation
The UF modules can be installed on either side of the manifold and could be installed all in
line or in staggered positioned.
Install the rack at an even ground. Otherwise, adjustable mountings are recommended for
profile adjustments.
The frame of this rack must be designed and built to have fully support of the membrane
modules.
Protect the modules against overturning, rocking and instability, therefore holding straps
are recommended to be installed at the top and bottom to provide lateral stability and grip
to the membrane modules.
Vibrations in the rack must be avoided and compensated.
Sufficient space must be allocated on the bottom for maintenance and pipe/hose length
connections.
Do not use the modules or the module connectors for mechanical support during assembly.
Dimension the headers in order to reduce the pressure loss inside the headers to a minimum.
Design of the Filtration Stage
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Form-No: TM-WW002 // Revision: A // Date: Oct. 10, 17
Figure 7: Example of a MICRODYN AQUADYN
®
UA860 rack
Figure 8: MICRODYN AQUADYN
®
UA860 rack with hard pipe connections
Operation Procedures for MICRODYN AQUADYN® UA860 Modules
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Form-No: TM-WW002 // Revision: A // Date: Oct. 10, 17
6
Operation Procedures for MICRODYN AQUADYN
®
UA860 Modules
The following chapter describes the start-up and operation guidelines for MICRODYN
AQUADYN
®
UA860 membrane modules.
Before the commencement of any start-ups, we recommend that a reverification of the feed wa-
ter composition is carried out.
MICRODYN-NADIR recommends that wherever possible, operation and maintenance staff
shall be involved in the commissioning process. Additionally it is recommended that the start-up
is carried out in manual mode for all function tests prior to switching to automatic start-up for
monitoring any anomalies.
Start Up Checks
6.1
Before any start-up, i.e. starting of any operations with water, always ensure the following rec-
ommendations for visual inspection and functional checks:
1) The equipment (valves, pumps, air blowers, dosing pumps etc.) to be used is installed cor-
rectly and in good working condition.
2) The measuring instruments to be used are calibrated and properly installed.
3) The program controlled by the PLC is functional and runs without any error which can result
in any constant switching on/off of the system resulting in water hammering during flushing.
4) The membrane modules are installed correctly.
Make sure that the entire system is clean, especially piping and tanks in order to avoid a de-
contamination of the membrane modules.
Regular Operating Procedures
6.2
The regular operating procedures would comprise of the following:
1) Filtration
2) Hydraulic cleaning, see below note.
3) Chemically Enhanced Backflush (EBF) and/or Cleaning-In-Place (CIP)
Important information
Note
-
It is advised to execute an initial backflush at the first start up (make sure the
back flush tank is filled with clean water).
6.2.1 Operation of Filtration Stage
During filtration, the feed water is treated by applying pressure through the ultrafiltration mem-
brane fibers from the shell side (exterior of the fibers, within the membrane modules) to the lu-
men side (interior of the fibers, accumulated at exposed lumen-ends). The rejected particulates
are thus blocked by the fibers, accumulating and forming a filtration layer on the exterior of the
membrane fibers.
i