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FOG Causing Primary Clarifier Failures(5)
Erwin Bonatz
Posted: Monday, May 14, 2012 10:46 AM
Joined: 6/15/2010
Posts: 4

I manage a large treatment plant in Virginia Beach VA.  This plant has a large service area, very concentrated household and resaurant/hotel waste, and a very long travel time up to 3 days to get to the plant.  All flow is conveyed via force mains.  From Mid April through November we have a problem with very thick floating sceptic greasey scum in our primary clarifiers; that if not continuously manually skimmed, will cover the clarifier and completely overwhelm the scum collection system and cause the solids collection flights/chain to jump its guide sprockets and derail in the clarifier.


I am trying to contact other plants that might have this same problem and hopefully learn a few successful ways to either prevent this from happening or actually remove the greasey scum automatically without a lot of manual labor.


Erwin E. Bonatz Jr. P.E.

HRSD Atlantic Treatment Plant Manager

757 821 7402


Thomas Eckhoff
Posted: Sunday, May 20, 2012 11:25 AM
Joined: 10/7/2009
Posts: 4

Do you have an Industrial Pretreatment Program or a grease management program for the restuarants in your district? Larger WTPs typically have programs of this sort to manage this before it gets to the treatment plant.