Advantages of Different Lamella Clarifier Designs

Advantages of Different Lamella Clarifier Designs

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Allen Hazen defined in 1904 the law for sedimentation:

Vs – settling velocity of a particle divided by settling height – has to be bigger as – Water flow Q divided by tank volume.

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Applied to a lamella clarifier this means that a particle is only settled down when the settling velocity of the particle divided by channel height, is bigger than the water velocity divided by the channel volume.

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Vs of the particle must be bigger than the upward stream Q.

Case 1: Vs divided by H is bigger as Flow Q divided by channel volume. The particle can be settled down.

Case 2: Vs divided by H is smaller as Flow Q divided by channel volume. The particle cannot be settled down.

When the channel distance of the plates is equal, H can be crossed out of the equation.   Then L multiplied W projects the surface area of the lamella clarifier module in the horizontal direction.

Learn more about lamella clarifiers on AET's blog.