In the sophisticated world of wine production, cross-flow filtration is a key step in achieving high quality wine. However, as in any process, continuous processing brings with it challenges that require timely responses. This is the case with backwashing in dealing with certain situations where filtration becomes difficult.

In this article we will understand what backwashing is and how it works in wine production and why it is a good choice for wineries that focus on quality and productivity.

WHAT IS BACKWASHING IN TANGENTIAL WINE FILTRATION?

Widely used in the wine production process, cross-flow filtration has the natural characteristic of causing fouling of the filtrate on the filter membrane.

These are caused by the accumulation of particles and impurities that settle on the membrane surface during filtration.

To tackle this problem and remove the impurities, the backwashing process is of great benefit. This consists of temporarily reversing the pressure across the filter membrane using a secondary pump.

The flow reversal allows the permeate to flow back into the feed liquid, thus lifting and removing the fouling layer from the membrane surface. The result is a greater filtration surface area, increasing the efficiency of the process.

THE BENEFITS OF BACKWASHING

The use of backwashing provides a number of significant advantages in the context of cross-flow filtration of wine:

1. Maintenance of high filtration efficiency: removal of fouling allows a constant filtration efficiency to be maintained, making the process more stable and predictable.
   
   
2. Prolonging membrane life: backwashing removes the fouling layer that accumulates on the membrane surface. This layer, if not removed, can lead to faster deterioration of the membrane, thus requiring more frequent replacement. By removing the fouling, the membrane can function optimally for longer periods of time.
   
   
3. Reduced maintenance and spare parts costs: a longer-lasting membrane means fewer costs associated with its replacement and maintenance.
   
   
4. Operation at lower pressures: effective cleaning of the membrane allows operation at lower pressures, resulting in energy savings.
   
   
5. Improved wine quality: the removal of particles and impurities from the surface of the filter membrane allows operation at lower pressures, which is more conducive to preserving more delicate substances in the wine.

HOW TO IMPLEMENT BACKWASHING IN TANGENTIAL FILTERS?

Wineries wishing to exploit backwashing in tangential filters can do so in two ways: by purchasing a filter already built with the appropriate circuit and other elements necessary for the process, or by adding it later.

Let us see in more detail how it works in each of the two scenarios.

In a new system

If you are planning the purchase of a new tangential filter, it is advisable to integrate backwashing from the outset. This way the machine will already be built with the technical requirements of backwashing in mind, which saves on the final cost.

Be sure to choose a diaphragm and a secondary pump that are compatible with this technique. In addition, it is useful to have an automatic control system that can reverse the transmembrane pressure at predefined intervals.

An example of a doctored backwashing tangential filter model is the TMCI Padovan Nitor CA 80:

Used filter

If you already have a cross-flow filter in operation, the implementation of backwashing may require some modifications.

First of all, the compatibility of the membrane and pump with backwashing must be checked. It may be necessary to install a secondary pump as well as upgrade the filter PLC to handle pressure reversal.

Some process tricks to consider

1. Timing: the frequency of backwashing will depend on various factors such as the type of wine, must quality and operating conditions.
2. Pressure: the pressure at which backwashing is carried out must be carefully calibrated to be effective without damaging the membrane or compromising the filtered product.
3. Monitoring: to ensure the quality of the process, it is essential to monitor the effectiveness of backwashing through certain indicators.

Implementing backwashing requires careful planning and constant monitoring, but the long-term benefits in terms of efficiency and cost reduction are considerable.

Consult us for advice on the feasibility of upgrading the filter in your cellar.

WINE FILTRATION WITH BACKWASHING: QUALITY AND PRODUCTIVITY WIN OUT

In the world of wine production, cross-flow filtration is a key step in ensuring a high quality product. However, to achieve the best results, it is essential to implement techniques that optimise the yield and quality of the process.

This is where backwashing comes in, a practice that not only improves filtration efficiency, but also the quality of the wine produced.

If you are considering implementing a new filtration system or optimising an existing one, backwashing is a solution that deserves serious consideration.

Its implementation may vary depending on the starting point, a new system or upgrading an existing one, but the benefits in terms of efficiency and quality are equally appreciable.