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Pos. Module
7
Self-cleaning prefilter
8
Level sensing
External CIP unit
9
(accessory)
Activated carbon
10
filter (GAC filter)
11
Internal CIP
Remote
-
management
14
Description
It is a requirement that the water flowing through the UF membrane contains only particles smaller than
300 µm. To comply with this requirement, the self-cleaning prefilter module can be chosen to filter the
water inlet to the UF membrane. The self-cleaning prefilter module includes a filter with a mesh size of
100 µm. The main components of this module are:
• one self-cleaning prefilter
• one motor valve
• one pressure sensor.
An external tank for clean water can be added to the system. The external tank provides a buffer between
the system and the consumer. With the external tank the system is able to produce more continuously,
because it does not stop each time the internal tank is full. Water can be tapped from the external tank
while the system utilises the internal tank for automatic cleaning sequences. The external tank can be
installed in two different setups. See section:
The external tank is not supplied by Grundfos but always sourced locally by the operating company to
avoid high shipping costs. However the pressure sensor used to determine the water level in the external
tank, is supplied by Grundfos. The level sensing module includes only the pressure sensor.
If the UF membrane is fouled to an extent where it is no longer possible to clean the membrane with
regular backwash and internal CIP, an external CIP has to be performed. During an external CIP strong
acids and bases are applied in a closed circuit around the UF membrane and circulated. The mobile
external CIP unit is only connected to the system while the external CIP is performed by certified service
staff.
The external CIP sequence requires the use of feed pump, backwash pump and motor valves. The
components of the external CIP unit are controlled manually. A 1000 litre chemical waste tank must be
provided on site to collect the waste water from external CIP. The main components of this module are:
•
two flow indicators
•
one chemical tank
•
one heater
•
one circuit breaker box to control the heater
•
one level switch.
A Granular Activated Carbon (GAC) filter module can be added to the system. The GAC filter is used to
remove colour and certain chemicals, particularly organic chemicals, from the filtered water. The GAC
filter is also used to remove chemicals such as chlorine and hydrogen sulfide, that give objectionable
odours or tastes to the water. The water from the clean water tank is filtered first through the GAC filter
and then through a cartridge filter.
A distribution module and the external tank setup 2 are mandatory, if the activated carbon filter module is
used. This is because the system must be able to close the distribution during automatic cleaning tasks.
See section:
6.5.1 External tank setup
The main components of this module are:
• one GAC filer
• one multiport valve
• two pressure sensors
• one cartridge filter.
The internal Clean In Place (CIP) module provides an enhanced cleaning of the UF membrane, which is
performed after several membrane backwashes to clean the membrane more efficiently. An internal CIP
cleaning is performed once a day at the most.
Systems with internal CIP module always include a chlorination module as well, because sodium
hypochlorite solution is required for the internal CIP process.
During an internal CIP, a closed circuit flowing through the membrane is established. Sodium hypochlorite
solution is dosed into the closed circuit and circulated to loosen and dissolve the fouling on the UF
membrane. See section:
6.6.10 Internal
The main component of this module is a circulation pump.
The Grundfos Remote Management (GRM) module provides remote monitoring of operational status and
performance. Broadcasting of warnings and alarms as well as upload and download of parameterisation
files is possible. The main component of this module is the SECOMEA box (router and VPN connection).
A USB modem (3G or higher) must be provided by the customer to access the GRM webpage. The
SECOMEA box also provides a remote control function of the system for troubleshooting or maintenance.
See also section:
7.7 Grundfos Remote Management
6.5.1 External tank setup
options.
CIP.
(GRM).
options.
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