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Four times higher flow rate than conventional clarifiers

High-speed Clarifier (Sedimentation Tank)

Why Toshiba?

In the field of industrial water treatment, a large space is needed for conventional clarifiers (sedimentation tanks) due to the low efficiency of suspended solids sedimentation leading to a low flow rate of treated water.
We, Toshiba, have developed a high-speed clarifier (sedimentation tank), which implemented latest fluid simulation to achieve appropriate flow dispersion and four times higher flow rate than conventional clarifiers.

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  • This clarifier separates suspended solids from wastewater by sedimentation at a high water linear velocity of more than 4 m/h (four times higher than conventional clarifiers).
  • It can reduce construction costs by reducing the diameter and height of the tank.
  • By virtue of the higher flow rate, it requires only one fourth of the installation space, compared to conventional clarifiers.

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Original Structure

With latest simulation technology that leads to higher sedimentation efficiency and flow rate than conventional clarifiers, we built the original structure.

Battery-operated Electromagnetic TOSAQUA -Sedimentation tank -

  • 1 Structure to distribute flocs Raw water from the feed well flows uniformly into the clarifier (sedimentation tank).
  • 2 Structure to prevent flocs Most of the flocs near the wall are prevented from being carried over.
  • 3 Structure to refeed flocs into the feed well Some of the flocs carried over are fed into the feed well again.

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Configuration Example

Configuration Example of Toshiba's High-speed Clarifier (Sedimentation Tank) Combined with Pre-treatment System

Process Flow

Pre-treatment and high-speed sedimentation are carried out.

Process Flow Process Flow


Chemicals are added to the raw water, and small particles are formed into flocs that can be separated by sedimentation.
pH control is applied when necessary.


High-speed sedimentation

Flocs are separated from the pre-treated water by sedimentation. Sedimentation is carried out at four times faster flow rate than conventional clarifiers.
Sludge is pulled out of the tank and sent to the sludge treatment process.

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High-speed Clarifier (Sedimentation Tank) TOSAQUA™ Leaflet

Please download the High-speed Clarifier (Sedimentation Tank) TOSAQUA™ leaflet.

High-speed Clarifier (Sedimentation Tank)  TOSAQUA™ PDF Leaflet


  • 1) Why Toshiba?
  • 2) Highlights
  • 3) Original Structure
  • 4) Configuration Example

High-speed Clarifier (Sedimentation Tank) TOSAQUA™ (PDF: 406 KB)
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Global Network

With our expertise and rich experience in water and sewerage infrastructure development in Japan, we conduct business on a global scale.
We operate worldwide, and enhance capacity to provide the best solution to meet the needs of our clients.
We contribute to the creation of environmentally advanced communities with sustainable water infrastructure in response to regional, cultural and environmental requirements.


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