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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Poor Settling
Posted: Thursday, October 4, 2012 4:23 PM
Joined: 10/28/2010
Posts: 2

This last month our SVIs have slowly been increasing. It is now to the point where the clarifiers are bulking. There are no signs of bulking filaments (Type 021N) and very little signs of microorganisms under the microscope. The floc looks extremely dispersed and nothing can seem to attach to what little floc is there.

This is very perplexing because the nitrification/denitrification is doing extremely well. I cannot grasp the fact the autotrophic organisms are having no problems whatsoever. In the past, the autotrophs have always been the organisms first to go when we felt as though something toxic hit the Plant. Usually we see ammonia bleed through in the secondaries. Another unusual note is that our Nitrate numbers have dropped a couple parts. My feeling is that there is more carbon available in the anoxic zone because it is not being assimilated in aeration. Just a thought!!!

All the analyses we have done to find the smoking gun are not showing any unusual differences or higher than normal numbers. Has anybody else seen this anomoly?


Posted: Monday, March 3, 2014 9:58 PM
Joined: 3/3/2014
Posts: 1


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