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Contaminant-Removal from Wastewater in a Secondary Clarifier by Sedimentation

Application ID: 2163

Wastewater treatment is a several-step process for removing contaminants. Firstly, large, solid particles are removed through sedimentation, flotation, and filtration. And then in a second step, biological treatment causes the smaller particles to aggregate, forming so called flocs. These flocs can be more easily removed by processes such as sedimentation.

In a circular secondary clarifier, flocs are removed from water through sedimentation, where gravity causes the flocs to fall toward the tank bottom. However, the turbulent flow in the tank tends to mix the phases together, and thus has a negative effect on the separation.

This example studies the separation of flocs from water in a circular secondary clarifier. The object is to study the complex turbulent multiphase flow using the Mixture Model application mode.

This model is included as an example in the following products:

CFD Module

The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.