Quality and Maintenance
The Oenoflow XL systems utilize components with proven reliability from well-known, industry-accepted manufacturers. This allows for convenient supply of spare parts anywhere in the world.
Qualified Pall personnel are available to carry out scheduled maintenance service for objective verification of the operating system, ensuring optimal use.
New XL Modules
The new large diameter Oenoflow XL modules incorporate Pall's proven PVDF membrane with approximately 145 % more filter area. With 21.5 m2 of surface area the XL modules have at least twice the area of typical competitive hollow fiber membranes.
These high flow modules allow Pall to manufacture more compact and therefore more economical systems. With a smaller footprint and less water and chemical consumption, Oenoflow XL systems are in line with many wineries sustainability programs.
Oenoflow XL modules have been qualified for compliance to specific regulatory standards for products coming into contact with foodstuffs. For further details, please contact Pall.
Opposing the “Gel Layer”
The use of a dedicated and specific wine membrane is essential, however, it is also necessary to keep the membrane as clean as possible. The contamination layer on the membrane (typically called a gel layer) can interfere with filtration, creating a further barrier by slowing down the flow rate and increasing filtration time. Additionally, acting as a filter itself, the gel layer can result in negative effects on the quality of the filtered wine.
Maintaining membrane cleanliness by opposing the gel layer enables the system to perform at its optimal operating condition. Filtration flow rate and the organoleptic characteristics are consistently maintained by the following process characteristics.
The “Back Pulse”
An energetic trans-membrane pressure pulse in the reverse flow direction systematically breaks the gel layer to restore membrane permeability. This process allows wine to continue unrestricted contact with the membrane resulting in longer and more consistent operation. This useful technique plays a key role in the overall system performance.
The uniform structure of the Oenoflow XL hollow fiber membrane has a high mechanical strength that protects it from risk of failure even after many years of continuous operation. A back pulse can apply prolonged mechanical stress on a membrane, however, the Oenoflow XL hollow fibers are constructed to resist this.
“Dynamic Solid Control” (DSC)
In addition to increased surface area modules, the Oenoflow XL series incorporates a new and evolved flow distribution. With this new operating logic, the system gradually, but continuously, modifies the percentage of the solids present in the recycling loop upstream of the separation membrane. This “dynamic solid control” (DSC) also opposes stabilization of the gel layer.
Coupled together, the back pulse and DSC, both fully automated, provide increased system performance and longer filtration cycles.