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Why is a grit removal system necessary for wastewater treatment plants?

It is vital to ensure wastewater is clean enough to get discharged. It is a complex task. The correct solution plays an integral role. Grits are a huge problem for the wastewater plant. They can cause damage and increase maintenance costs throughout the treatment procedures. Grit removal from wastewater stands strong. Read this article to know more about grit removal.

 

What is grit removal?

 

Grit particles are smaller particles which are even tinier than the screen aperture. When they pass through, can cause several abrasive issues on the pumps, pipes and sludge handling tools. Grit particles settle down in the channels or sludge digestors cand can cause maintenance issues. So a grit removal system is needed for the sewage treatment plants.

 

You can remove grit by the differential sedimentation process where the flow velocity is controlled. It let the grits settle. Grit and many other particles can be well-separated through circular or longitudinal grit removal systems. 

 

The grit removal systems are usually found at the headworks of wastewater treatment plants. This system can be used to eliminate sands from the river water intakes before the processing for usage in industrial applications, potable water etc.

 

Why is grit removal necessary?

 

Sands in any treatment plant can reduce the system capacity and elevate maintenance costs. In the wastewater treatment plants, grit & solid materials like silts and sugar sands clog the systems and reduce the efficiency. The grits can cause abrasion damage and wearing can happen to result in increased cleaning and repair. Operators must not miss how much grit is present in wastewater. A proper and effective grit removal system can eliminate sands and abrasive solids before they enter into other processes and start eroding costly equipment and in the end deposit throughout the wastewater treatment plant. So, grit removal from wastewater is vital.

 

Different kinds of grit removal systems:

 

There are different kinds of grit removal systems. The main of them are:

 

a) Aerated grit chamber

 

In aerated grit chambers, the grit is eliminated by leading the wastewater to flow in the spiral pattern. Air is proposed in the grit chamber from one side that causes a pattern of perpendicular spiral velocity to flow. The heavier particles get accelerated and separate from streamlines by dropping to the tank's bottom. This process has consistent grit removal efficiency over a broad flow range.

 

b) Vortex-Type Grit Chamber

 

Vortex-Type Grit Chamber contains cylindrical tanks where the flow goes through tangentially by creating the vortex pattern of flow. Grit settles down by gravity at the tank's bottom and the effluent goes up at the tank's top portion. Grit settling down can be eliminated through a grit pump or airlift pump. This system can remove a higher percentage of fine grits. The footprint of a vortex-type grit chamber is lesser compared to the other grit removal systems. It is beneficial when space is a problem.


Grit removal from wastewater is necessary to work otherwise many issues can arise in wastewater treatment plants. Grits are abrasive that can produce wear on the equipment like pumps and other treatment surfaces. Grits can lead to a loss in the treatment capacity of a plant. No WWTP owner wants all these issues to happen. So a proper grit removal system is needed. Reach out to a reliable supplier of grit removal systems.

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