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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Tempes on activated sludge treatment facilities
Posted: Tuesday, April 5, 2011 2:39 AM
Joined: 4/5/2011
Posts: 1

Here has an on going problem in colder climates. In colder climates, most activated sludge treatment are poor settling. Such as SBR, contact stabilization, extended air, etc. they all seem to suffer from the same problem once their temps. drop below about 10 C. Has any one come across any studies or articles on this problem?

Luis Manriquez
Posted: Monday, May 23, 2011 12:53 PM
Joined: 1/6/2010
Posts: 22

I do not have any direct references to this problem but a recent AWWA jornal dealing with generating energy from wastewater made a passing mention that some European treatment plants were using their digester gas to warm up their aeration basins to improve their cold-weather performance.

The exact process was not described but I figure it may have been a gas-fired boiler water loop.


Hope this helps.


Luis Manriquez

Posted: Tuesday, May 24, 2011 5:40 PM

You may want to pose your question to a much more active forum: