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BECOPAD depth filter sheets meet BECO PROTECT CS depth filter cartridges
After the successful market launch of the BECO PROTECT FS FineStream depth filter cartridge in 2012,
Eaton has succeeded again in setting a new milestone in filter cartridge technology: The new
BECO PROTECT CS CellStream depth filter cartridge.
The goal was to combine the advantages of the depth filter cartridge with those of a mineral-free depth
filter sheet to deliver improved:
 protection of membrane filter cartridges
 microbiological germ retention rates
 retention capacity for colloidal particles
 ability to backwash for maximum economy
Rather than using conventional polypropylene filter material, BECO PROTECT CS depth filter cartridges
are made of an adapted BECOPAD depth filter sheet. This is composed of pure, natural cellulose.
The filter sheet material is manufactured using a special production method and, using innovative
technology, wrapped to form a depth filter cartridge (see Fig. 1). The support fleece, inner core and outer
cage, adapter and end cap are all manufactured from polypropylene and shape the new filter material to
form a depth filter cartridge. This unique combination maximizes the filter area and ensures a high degree
of stability against mechanical and thermal influences.
Fig. 1: Innovative wrapping
The product range includes three types of filter cartridges: the CS 115, CS 170 and CS 270 and is
available in lengths of 30" and 40" with code 2 or code 7 adapters. This range of sizes and adapter codes
allows for installation directly into existing filter cartridge housings, which will help to easily perform fine to
sterile filtration (see Fig. 2).
The main function of these new filter cartridges is filtration prior to bottling, so as to protect the membrane
filter cartridge (thus acting as a police filter).
Fig. 2: Fields of application
Meeting the quality and performance demands of modern oenology, including factors such as excellent
aroma and color preservation, fast neutral rinsing, no lost drops and gentle filtration (also known as germ
reducing or sterile filtration), without any adverse effects on the product are among the foremost concerns.
Conventional depth filter cartridges are characterized by “pure” particle or yeast separation. The fine
cellulose matrix of the BECOPAD depth filter sheets used in BECO PROTECT CS depth filter cartridges
also removes the finest colloid particles and bacteria. This reduced particle concentration significantly
increases the service life of the subsequent membrane filter cartridges.
Other features that may reduce process costs are:
 filter material needs up to 50% less rinsing volume
 fast regeneration makes it easy to switch from red wine to white wine filtration
 suitable for very small quantities
 standard adapters allow for use in commercial filter cartridge housings eliminating the need to
invest in new housings
In comparison to filtration with stacked disc cartridges, these depth filter cartridges provide simpler
handling, faster regeneration and a minimum of product loss during wine change.
The table below sets out various different parameters and recommended applications:
Parameter
Recommended application
Flow rate
Max. 132 gal/h/30" (500 l/h/30")
Max. 174 gal/h/40" (660 l/h/40")
Max. blocking for optimal regeneration effect
Δp 11.6 psi (80 kPa, 0.8 bar)
Max. steam cycles
50 - 100
Ability to backwash
Up to 29 psi (200 kPa, 2 bar) at 176 °F (80 °C)
Cold and hot water consumption
Cold water: approx. 2.6 - 4 gal/30" (10 - 15 l/30")
Hot water: (ideally at 176 °F/80 °C)
approx. 7.9 - 10.6 gal/30" (30 - 40 l/30")
Residual quantity after product change
< 0.5 l/30"
Wine change (from red to white wine)
Cold water: approx. 2.6 - 4 gal/30" (10 - 15 l/30")
Hot water: (ideally at 176 °F/80 °C )
10.6 gal/30" (40 l/30")
Repeated sterilization with condensate and
rinsing water check//control
Sterilization
Steam sterilization: at 230 °F (110 °C),
7.3 psi (50 kPa, 0.5 bar) for 30 minutes max.
Hot water sterilization: at 185 °F (85 °C)
for 30 minutes
Service lives
Approx. 150,000 l/30"
depending on the type of filter cartridge and the
filterability of the unfiltered liquid
Filterability of the unfiltered wine
> 0.4 gal (1.5 l) with CS 170/115 filter cartridge
(determined with the BECO LiquiControl2 index
types
measuring device)
> 0.2 gal (0.8 l) with CS 270 filter cartridge type
Preservation over extended production downtime Wet preservation with an 0.2% solution, e.g.
(> 2 weeks)
peracetic acid or hydrogen peroxide
If the filter cartridges are removed, make sure
that the seals are detached before wet
preservation. Eaton recommends rinsing and
sterilizing the filter cartridges again before
reusing.
Table 1: Parameters and recommended applications
Recommended applications and the following points should be observed to obtain maximum efficiency.
Optimal pre-filtration
The service life of BECO PROTECT CS depth filter cartridges, similar to conventional depth filer
cartridges, is dependent upon the filterability of the wine, flow rate, pre-filtration grades of the wine and
service media (water) and compliance with the recommended regeneration guidelines.
Another factor is observance of the manufacturer’s recommended timing and usage quantities for adding
colloidal treatment agents such as gum arabic, tartaric acid and tannins.
Regeneration
For optimal regeneration, Eaton recommends always regenerating new depth filter cartridges after every
use, but certainly no later than when a differential pressure Δp 11.6 psi (80 kPa, 0.8 bar) is reached. The
earlier cleaning is performed, the more effective its result. The rinse water should be pre-filtered with a
depth filter cartridge of at least 1 µm to avoid unnecessary loading with dirt particles.
Flush the depth filter cartridge with cold water against the direction of filtration. Then rinse with hot water
at approximately 176 °F (80 °C) and a maximum of 29 psi (200 kPa, 2 bar) until the rinsing water is clear
of impurities (using a visual check). Leave the hot water in the housing overnight to improve the cleaning
effect. Regeneration against the direction of filtration direction is more effective than in the direction of
filtration.
Filterability
In order to design the most effective filter media compatible to the wine to be filtered, the filterability of
various wines was determined with high precision using a mobile index measuring device
(BECO LiquiControl2). The initial flux (flow rate at the start of the measurement) and the end flux (flow rate
at the end of the measurement) for the total quantity to be filtered were measured at a defined pressure of
14.5 psi (100 kPa, 1 bar) across an 0.45 µm PVDF membrane.
The graph below shows the results obtained in practical operation.
Flux in ml/min
Index Values
450
400
350
300
250
200
150
100
50
0
Unfiltered Chardonnay
Chardonnay after filtering
through CS 115
Dry Riesling Unfiltered
Dry Riesling after filtering
through CS 115
0
1.000
2.000
Filtrate in ml
Fig. 3: Filterability measurement of different wines before and after filtration with BECO PROTECT CS
depth filter cartridges
Figure 3 clearly shows the filterability measurements for Chardonnay and Riesling. The unfiltered
Chardonnay was very difficult to filter, as the test membrane quickly became blocked. After pre-filtration
with the BECO PROTECT CS 115 depth filter cartridge, a noticeable increase in filterability was achieved
and the subsequent membrane was well protected.
The Riesling already possessed very good filterability, which is why the curves for the unfiltered liquid and
the filtrate are almost identical.
Summary
The BECO PROTECT CS depth filter cartridges combine the advantages of cartridge filtration with those
of sheet filtration using BECOPAD depth filter sheets. The three types of cartridges together cover a wide
range of filtration tasks. The cartridge types represent an economical alternative to conventional filtration
solutions in terms of both fine filtration and membrane protection.
Authors:
Hans-Peter Discher,
Filter Media Product Manager
Eaton Technologies GmbH, Langenlonsheim, Germany.
[email protected]
Dieter Speh,
Application Engineer
Eaton Technologies GmbH, Langenlonsheim, Germany.
[email protected]