Food Contact Compliance

• Pall Oenofine XL Filtration Systems Declaration of Compliance

Unique Bentonite

Pall recommends the use of of Erbsloh's Ultrabent Poretec UF or Blancobent UF bentonite for protein stabilization of wine in conjunction with the Oenofine XL system. These products have a well-defined particle size distribution enabling wear-resistant and gentle application with membrane systems. For further information on Ultrabent Poretec UF and Blancobent UP, please contact your local Erbsloh representative.

Proven Membrane

At the heart of the Oenofine XL system, is a Pall hollow fiber membrane that has been proven in wine clarification applications for over 10 years. Developed specifically for wine use, the membranes have negligible impact on wine characteristics and the capacity to handle high solids. Constructed from robust polyvinylidene fluoride (PVDF), the symmetric membrane permits high flow performance and long filtration runs without irreversible plugging.

The Oenofine XL membranes' high mechanical strength ensures wear-resistance when exposed to typical wine contaminants like fining agents, crystals or solids left over from upstream processing which other hollow fibers cannot tolerate. When coupled with the capability to backflush, the Oenofine XL modules demonstrate high solids operation and long service life making them ideal for the combined stabilization and clarification task.

Additionally at 21.5 m² of filter area, the PVDF modules have more than twice the filter area of competitive hollow fiber clarification modules. The high flow modules enable compact and economical systems.

Traditional Protein Stabilization

Bentonite fining is the current industry standard for protein stabilization of white wine. While the traditional method is effective, the settling time, labor and handling, and waste associated with the existing process can add significant costs and limit a winery's overall capacity. 

Bentonite, being negatively charged, can bind positively charged proteins in wine to prevent precipitation in the bottle. Although bentonite reaction time occurs almost instantaneously, wineries will typically allow days of settling prior to downstream processing. Long settling time generally improves filterability and is even a requirement for some membrane filtration systems, however, on the other hand, it can also be viewed as unfavorable due to protein discharging from bentonite platelets.

Additionally depending on the type of bentonite, the lees volume after treatment can range from 2 to 10 % leading to high waste disposal volumes or the necessity to implement further labor intensive and quality reducing steps to recover more wine.

Wine Clarification

After protein stabilization, filtration is typically carried out to remove suspended solids and further prepare the wine for additional steps prior to bottling. Various methods of filtration may be employed. Diatomaceous Earth (DE) and sheet filters are the more classical filtration technologies and may be combined or used in multiple stages to achieve the filtrate quality requirement.

In recent years, crossflow filtration systems have become a widespread cost saving alternative to the traditional filtration techniques. Crossflow filtration eliminates the use and disposal of filter aids, has low water and energy consumption and provides consistent wine quality with minimal preparation and labor.

With many modern crossflow systems bentonite can cause irreversible fouling or abrasive action on the membrane surface which can ultimately jeopardize membrane integrity.

Pall's newest development, the Oenofine XL system overcomes these obstacles. Proprietary activated bentonite from Erbsloh, Ultrabent Poretec UF or BlancoBent UF is dosed upstream of the hollow fiber membranes resulting in single step protein stabilization and clarification. The Pall Oenofine XL system enables wineries to reduce bentonite consumption, eliminate settling time after bentonite fining, and reduce wine waste and lees volumes. Additionally by reducing the turn around time for fining and filtration, wineries can even increase their total production capacity.

Quality and Maintenance

The Oenofine XL system utilizes components with proven reliability from well-known, industry-accepted manufacturers. This allows for convenient supply of spare parts anywhere in the world.

Typical Average Performance Over 4 to 6 Hours of Operation

Oenofine System	Flow Rate
	Wine Stabilization	Wine Clarification
XL-6A	65 hl/hr	50 - 105 hl/hr
XL-8A	86 hl/hr	65 - 140 hl/hr
XL-10A	108 hl/hr	85 - 172 hl/hr
XL-12A	130 hl/hr	105 - 205 hl/hr
XL-14A	150 hl/hr	120 - 240 hl/hr
XL-16A	172 hl/hr	135 - 275 hl/hr
XL-18A	195 hl/hr	155 - 310 hl/hr

Systems

Flexible System Design

The Oenofine XL system is a fully automated crossflow hollow fiber system available from 6 to 18 modules. A small dosing skid allows automatic control of the bentonite addition for stabilization. As an option, Pall can provide a dosing tank and supplementary skid for solids evacuation and system storage in the case of a power failure. Additionally, the flexible software enables wine clarification without stabilization, similar to Pall's Oenoflow XL systems. 

Pall offers a wide range of customizable options including but not limited to:

• A dosing tank   
• A supplemental support system (for power loss)
• Low Concentrate Volume (LCV) (for Clarification only)
• Dual Pre-filter screens
• Nitrogen purge and blanketing
• Tank Distribution System
• An on-line turbidity meter

Our wine system specialists are available to assist in selection of the appropriate system and options. Please contact us.