Faq

When do you use a centrifuge?

The ecologic treatment plants and pig slurry treatment sites produce a final residual waste that passes through different working stages (equalisation, neutralisation, coagulation, sedimentation, flotation, biological treatment etc.) This waste is generally submitted to further physical processing, before it goes to final disposal. A centrifuge is applied in one of those processing stages, either at thickening or at dehydration.

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What is thickening and dewatering?

It concerns processing stages in which you get an effluent sludge (outgoing sludge) that is more concentrated than the influent material (inlet sludge).

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Why are the machines called Decanter?

This name comes from the word DECANTATION which means the clarification of a liquid obtained through the separation of suspended particles (sedimentation).

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What is sedimentation?

This is a process in which solid particles move into a liquid by means of gravity force, separating themselves from the liquid through depositing. In some cases (biological fluids) the time for spontaneous sedimentation would be too long and some particles take years for a sedimentation process. It’s in these cases centrifugation takes place.

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Why do you need centrifugation?

You can increase the force of gravity centrifugation, thus accelerating the sedimentation process.

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How does centrifugation work?

Once the material to be treated is inside the container it is rotated, in this way the solution is subject to an artificial gravity force (centrifugal force) which is proportional to the distance of the rotation centre and to the square speed of the rotation.

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How does a centrifuge work?

The centrifuge consists of a cylindrical and conic container (called a drum) which contains a mechanism based on an endless screw (called a scroll) which removes the solids. The material is fed into the unit through the scroll's axis. The centrifugal force generated by the drum's rotation puts the compact solid matter on the internal container walls and the endless screw which rotates at a lower speed, sends the compact solid matter along the container length towards the conic section, from which the product exits.

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What does the centrifuge's performance depends on?

The performance depends on the construction system itself and on the process parameters. The construction variables are: speed rotation, volume available and the speed extraction of the solid. The process variables are: speed feeding, solid specification, batches of chemical additives (polymer for the ecological sector and fossil flours for the food sector) and working temperature.

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How does the inlet capacity influence the performance?

By increasing the inlet capacity, the retention time (stay of the product in the centrifuge) and the solid recovery reduce.

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What is polymer and fossil flour good for?

Polymer (ecological sector) increases the structural resistance of the solids and encourages the formation of flakes even of the finest particles. The fossil flours (food sector) make the solid heavier. The use of these substances increases solid recovery.

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What is an Inverter?

It is an electronic device which produces a three-phase signal used for the starting of the electric motor.

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In this section we explain the principal working principles of our activity.

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