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Mechanical Preliminary Treatment

Removal of foreign matter from raw wastewater and sludge

Good mechanical pre-treatment protects the subsequent process stages from clogging, blockages, deposits and abrasion.

Solutions for mechanical preliminary wastewater treatment

Good mechanical pre-treatment protects the subsequent process stages from clogging, blockages, deposits and abrasion.

Removal of foreign, disturbing materials and solids from wastewater

Mechanical preliminary treatment is a prerequisite for reliable, low-wear and low-maintenance operation of the entire wastewater treatment plant.

With mechanical wastewater treatment, foreign matter and solids in the wastewater are removed by screens and fine screening systems as well as through sedimentation and separation processes.

The removed materials such as screenings, grit or primary sludge are fed to subsequent treatment stages.

As experts with decades of worldwide experience, we have the optimal solution for every mechanical pre-treatment task:

FAQ

Frequently Asked Questions

The first stage of wastewater treatment is the mechanical treatment stage, also known as mechanical pre-treatment or mechanical wastewater treatment. Here, mechanical processes are applied to remove pollutants from the wastewater. The following machines, plants and structures are used in these mechanical processes:

  • Screens for the separation of organic and inorganic larger solids
  • Grit chambers for the separation of grit and mineral substances
  • Sedimentation tanks, so-called primary clarifiers, for the separation of finer solid wastewater components or, alternatively, special screening machines replacing the primary clarifier, such as the HUBER Drum Screen LIQUID.

Wastewater to be treated in a municipal wastewater treatment plant contains a variety of substances, which may be present in dissolved or undissolved form. The undissolved substances, i.e. the solids, can be organic or inorganic. The size of the solids also varies greatly, as wastewater not only contains small solids such as sand, but can also contain solids very large in size.

Everything that can enter a sewer system will eventually end up at the sewage treatment plant. The mechanical treatment stage therefore has the task, as the first stage of wastewater treatment, to remove these solids, as they would interfere with or hinder the second stage of wastewater treatment, the biological stage.

Mechanical wastewater treatment can remove about 30% of the pollutants in wastewater. At first, screens remove mainly larger solids such as plastic parts, hygiene articles, stones, etc. The subsequent grit chamber separates grit, which is always present in municipal wastewater. The primary clarifier, either in the form of a primary settlement tank or a mechanical screening system, then separates finer solid organic and also inorganic wastewater pollutants.

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