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 
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Allythiourea (ATU) for nitrification inihibitor
Posted: Tuesday, January 26, 2010 12:59 PM
Joined: 1/26/2010
Posts: 6

Has anyone experemented with the use of ATU for nitrification inhibitor? (Std. Methods 21st edition). We have been doing some side by side comparisons with the Hach (TCMP) and the ATU and have not been having any luck with the ATU affecting the sample at all.

Posted: Tuesday, January 26, 2010 3:01 PM
Joined: 12/31/2009
Posts: 40

I've tried it once and got nothing from it.  I think it got ramrodded through the inclusion in SM because someone (Hach maybe) developed a CBOD seed that used it as its inhibitor.  I guess the thought was, even if the seed doesn't contain nitrifiers, it would eliminate one step in preparing the batch.  I've heard from several people that ATU just doesn't do as good a job as the pyridine based compound we are all familiar with.

R Myers
Posted: Friday, December 7, 2012 12:23 PM
Joined: 12/7/2012
Posts: 1

We are also having problems with the effectiveness of ATU for CBOD.  Interestingly, CBOD results are pretty reasonable for our treated effluent samples, based on parallels with TCMP.  CBOD measured for primary effluent and GGA however, are often the same or greater than the respective BOD’s.  When I checked the forum today I was I relieved to see it isn't just us.  We hope to continue automated addition, thus the need for a soluble inhibitor, but unless we can find a way to get TCMP into solution, we’ll likely go back to adding powdered solid directly to bottles.  I plan to continue to research this and I may also forward this concern to our DEQ regional representatives.   I would appreciate hearing from others who have experienced problems, especially anyone who may have come up with a way around the TCMP solubility issue.