Water and Wastewater.com Help Forums - Floation tank to aeration basin flow

KID YaBB Newbies Offline I love Water and Wastewater.com Posts: 6 Gender: Company or Organization: kiddywater	Floation tank to aeration basin flow May 14^th, 2012, 1:55am Ours is a 30 cubic meter unit, we have problems at floatation to aeration outlet. floatation overflows at 21 cubic meter flow. floatation to aeration is through a 6" pipe reducing to 4" at the aeration tank inlet. is there a way to correct this?
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Tom Keenan - nesa God Member Offline Environmental Consultant - contact info@nesa.ie Posts: 2103 Gender: Company or Organization: nesa environmental consultants	Re: Floation tank to aeration basin flow Reply #1 - May 14^th, 2012, 2:39pm Hi KID, I really think you need to try to explain the problem a bit better to allow people to understand the issues.
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grrun God Member Offline WaterandWastewa ter.Com is the best! Posts: 3525 Pekin, IL Gender: Company or Organization: Freelance Environmental Engine	Re: Floation tank to aeration basin flow Reply #2 - May 14^th, 2012, 6:28pm Why is the pipe reduced from 6" to 4"? What is the elevation change between the two tanks? My first response is to replace the 4" pipe with a 6" pipe. Now you need to better explain the problem. grrun
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KID

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Re: Floation tank to aeration basin flow
Reply #3 - May 20^th, 2012, 5:14am

Sorry, it took a while for me to get the actual details. The actual design for floatation to aeration had a 4" pipe and later was changed to 6". The nozzle on the aeration and floatation could not be changed and hence the pipe alone was changed. We found some sludge accumulating inside the pipe and hence,they had gone for this change.
The height variation is as follows,overflow level on floatation is 102.965 mm and aeration level is 102.600. The nozzle on floatation is at 102.630/102.580(pipe's centre point). Aeration inlet point is at 100.000 (pipe's centre point).
Hope these inputs can help resolve a solution.

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grrun God Member Offline WaterandWastewa ter.Com is the best! Posts: 3525 Pekin, IL Gender: Company or Organization: Freelance Environmental Engine	Re: Floation tank to aeration basin flow Reply #4 - May 20^th, 2012, 8:17pm I'm not a designer and Tom may be able to offer a better solution. Can you adjust the discharge levels of the aeration tank discharge or the discharge level of the final clarifier to provide a greater head difference between the flotation tank or possibly increase the operating level of the flotation tank? grrun
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KID YaBB Newbies Offline I love Water and Wastewater.com Posts: 6 Gender: Company or Organization: kiddywater	Re: Floation tank to aeration basin flow Reply #5 - May 20^th, 2012, 9:26pm We actually are in a thought of decreasing the aeration overflow to degasser weir height, but wanted to know if there is any other means. I was also interested to know how to calculate the height difference required to move 30cubic meter of flow accross floatation and aeration tanks.
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