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Continuous Flooding Filtration

Alluvionaggio continuo

What is continuous flood filtration?

Continuous flood filtration is a filtration process that relies on the deposition of suspended solid particles by a moving fluid. This type of filtration uses the principle of sedimentation to separate solids from liquid.

The term ” flooding,” precisely, refers to the process of particle deposition, similar to how alluvial deposits occur in streams.

Two stages can be distinguished in the process of flood filtration: the formation of a prepaneland the actual filtration. The prepanel is formed by adding the adjuvant (cellulose, perlite or kieselguhr) and the liquid to be filtered, this is passed through the filtration media (cloth) in which the adjuvant will settle forming a layer known as the prepanel. When the prepanel is ready, filtration is carried out, in the course of which the suspended solid materials gradually create shrinkage of the prepanel canaliculi. With this filtration technique, the filter medium acts simultaneously at both the surface and the depth. The process stops when the permeability falls below certain limits, that is, when there is a progressive thickening of the panel or due to the achievement of the predetermined maximum pressure.

How does continuous flood filtration work?

The flood filtration process generally follows these steps:

  • Preparation of raw material:

the liquid containing the solid particles is prepared for filtration;

  • Choice of filter medium:

the filter medium can consist of materials such as filter paper, fabric, membrane or other porous materials;

  • Installation of the filtration system:

The filter medium is placed in a special equipment. This can occur in a variety of devices such as pressure filters, gravity filters, or other types of filtration devices;

  • Passage of liquid through the filter medium:

Liquid containing solid particles is passed through the filter medium. Gravitational force helps the movement of liquid through the filter medium;

  • Separation of solid particles:

larger solid particles are retained by the filter medium, while the filtered liquid passes through. This process separates the solid particles from the liquid.

  • Recovery of filtered liquid:

the clarified liquid is collected in an appropriate container or tank.

  • Maintenance and cleaning:

Periodically, the filter medium may require maintenance or cleaning to remove accumulated particles and restore the efficiency of the filtration process.

Industries of use

It is important to note that flood filtration can be adapted to meet the specific needs of each food industry, and its application may vary depending on the type of food product being processed. However, it represents the most common technique in must filtration.

When to prefer this filtration method

The continuous flood filtration method is preferred in several situations where continuous removal of suspended particles is essential to maintain process efficiency. Here are some conditions in which this method can be particularly beneficial:

    • Continuous Processes:

When it is necessary to maintain a continuous flow of production without significant interruptions for filter cleaning. Continuous formation of the filter cake avoids frequent process stoppages.

    • Fluids with High Concentration of Particles:

When dealing with fluids with a relatively high concentration of suspended particles, and constant removal of these particles is essential to maintain the quality of the final product.

    • Minimizing Waste:

In situations where waste reduction is a priority. The formation of the filter cake helps to improve the efficiency of particle removal, reducing the amount of fluid discarded during the process.

    • Applications with Particles of Various Sizes:

When the particles in the fluid vary in size, the continuous flooding filtration process can be effective in capturing particles of different sizes through the gradual formation of the filter cake.

    • Sectors with High Cleaning Requirements:

In areas where hygiene and cleanliness are paramount, such as in the food and pharmaceutical industries, continuous flood filtration may be preferred to reduce the risk of contamination.

In general, the choice of filtration method depends on the specific needs of the application and the characteristics of the fluid to be treated. Continuous flooding filtration is particularly suitable for settings where continuity of the process is critical and the gradual formation of the filter cake can contribute to effective particle removal.

Sources:

1. L’Enologo: “Assoenologi Giovani. Rubrica dedicata alle notizie e alle nuove attività”, N°4 – Aprile 2020 https://www.quattrocalici.it/conoscere-il-vino/la-vinificazione-bianco/

2. Università degli studi di Padova: “Confronto sulla sostenibilità ambientale dei principali filtri enologici”.

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