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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DAFs, Polymer, Coagulant & YOU
Jay White
Posted: Monday, June 4, 2012 2:35 PM
Joined: 10/21/2009
Posts: 2


I work in industrial pretreatment.  We have a UASB anaerobic digestor as our primary treatment and an activated sludge system downstream as secondary polishing treatment.  We are installing a DAF inbetween our equalization and acidification tanks for the purpose of solids removal prior to the UASB.  We are having trouble planning and designing a dosing system without knowing much (anything) about polymer needs or the possible need for a coagulant.  Anyone know any good resources for this?

Thanks a lot,


Handsome Dan
Posted: Monday, June 25, 2012 1:25 PM
Joined: 6/25/2012
Posts: 4

We dose our DAF's with a diaphram pump out of a holding tank.  We use dry polymer, and mix it with a stranco unit.  We use our polymer at a concentration of 0.2% but im sure it will be different in your application.  Do lots of jar testing.