WEF Discussions — Now on LinkedIn!

WEF is pleased to announce the creation of free LinkedIn groups associated with its technical discussion forum topics. Through these LinkedIn groups, members will be able to view and participate in discussions, as well as communicate with one another via direct messages. Share your experiences and knowledge, ask questions and respond to other discussions as frequently as you like!

You must have a LinkedIn profile to join a LinkedIn group; you can create your profile here. If you already have a LinkedIn profile, all you need to do is submit a request to join one or all of the following groups:

Water Environment Federation (Main) | Biosolids | Collection Systems | Nutrients | Stormwater 
Utility Management | Water Reuse | Water for Jobs | Watershed Management | Laboratory Practices 

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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.