Understanding the concept

Wir können mechanische Wasserfiltration definieren als einen Prozess, bei dem unbehandeltes Wasser oder Rohwasser durch ein Filterelement geleitet wird, das die Weiterströmung von Schwebstoffen oder Partikeln verhindert. It is a very common process in various industries which involve the use of water, such as the food industry, water treatment facilities and water plants, to name a few. Typische Verunreinigungen sind Ton, Sand, organisches Material und Schutt. 

A filtration process can be divided in several stages depending on the type of contaminants and the cleanliness degree required for the process water.

The first filtering stage focuses on the removal of coarse suspended solids, which can be of various sizes and of different nature. These suspended solids are usually retained by means of a simple cartage filter with a filtration degree of 10 µm. The water could appear clear and transparent, but this does not mean that it is free of contaminants or particles. Even in clear drinking water there could still be small particles that are invisible to the naked eye.

After this first stage there could still be, in modest concentration, additional substances with dimensions from 0.001 to 0.01 microns such as sugar molecules, viruses and bacteria. On an even smaller scale (less than 0.001) we find dissolved salts and metallic ions. Potentially, any substance present in the water could be removed with the right filtering technique. This is why  mechanical filtration is very often used in combination with other filtration methods, for example to remove dissolved particles.

 

Filterauswahl

It is important to choose a filter type and filtration degree appropriate to the nature of the particles and contaminants to be treated. For instance, a filter that separates sand could be less effective in the filtration of colloidal particles. In addition, the level of automation of the cleaning cycle required in the system plays an equally important role in the design of the right solution.

Unser dolphin filters cover a wide range of filtration degrees, and can therefore be used in multi-stage solutions to handle most of the particles present in process water. The filtration degree is customised to your system’s requirements.

Depending on how the filter element is cleaned, dolphin filters are available as automatic or self-cleaning filters, non-automatic filters and manual or semi-automatic filters. 

• Non-automatic filters: the operator needs to open the filter to clean or replace the filtering element when the accumulation of solids on the surface of the filter causes a pressure drop higher than admissible.
• Manual or semi-automatic filters: the operator can clean or replace the filtering element without opening the filter.
• Automatic or self-cleaning filters: the cleaning process is completely automatic and does not require the intervention of the operator. Sensors detect the increased pressure drop and activate the cleaning cycle.

Do you need effective filtration?

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