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Short circuiting in Settlement tanks (Read 523 times)

AZS

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Short circuiting in Settlement tanks
Aug 04^th, 2012, 5:00am

Hi All,

One of the major causes of inefficiency in the sedimentation basin is short-circuiting, which occurs when water bypasses the normal flow path through the basin and reaches the outlet in less than the normal detention time.

Does short circuiting in settling tanks problems escalate only in High flows (Hydraulically over loaded plants)? Or even when the flows are within the design.

Please clarify

AZS

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grrun

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Re: Short circuiting in Settlement tanks
Reply #1 - Aug 4^th, 2012, 1:45pm

If I remember correctly, short circuiting is not a big problem unless the flow is turbulent. This is because while short circuiting has a higher velocity stream; the distance that a particle must fall or rise through the higher velocity stream is less and the relatively stagnent water out side the short circuited stream allows the particle to float or sink without much disturbance.

I hope to have remembered this correctly.

grrun

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The sludge judge God Member Offline Posts: 649 Wisconsin Gender: Company or Organization: private	Re: Short circuiting in Settlement tanks Reply #2 - Aug 4^th, 2012, 3:03pm uneven weirs, inadequite baffles, and solids/ algae buildup are all some causes of short cirtuiting. Waves or turbulance are factors too.
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NorCal_Wastewater1

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Re: Short circuiting in Settlement tanks
Reply #3 - Aug 6^th, 2012, 9:38am

If proper maintenance of the weirs isn't kept up then algae build up can increase the lieklyhood & rate of this issue.

Certainly if the size of the clarifier is small in diameter then manual cleaning can be done though inefficient use of the ops peoples time. There are several good wier washer devices to choose from.

Dallas

Have a great day,

Dallas

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