Effluent Nitrogen in an Activated Sludge WWTP
Effluent Nitrogen in an Activated Sludge WWTP
(OP)
What concentration of total nitrogen should we expect in the effluent of an extended air activated sludge plant? We will be nitrifying, but not denitrifying. Ammonia limit is 4 mg/L. We need to estimate total N for land application.
Thanks.
Thanks.





RE: Effluent Nitrogen in an Activated Sludge WWTP
RE: Effluent Nitrogen in an Activated Sludge WWTP
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RE: Effluent Nitrogen in an Activated Sludge WWTP
Yours is a common problem, ammonia limit of 4 is relatively easy to achieve, but you haven't gotten rid of the nitrogen, it's only changed forms until the denit stage. And with land application, you're concerned with nitrogen, in all its forms.
RE: Effluent Nitrogen in an Activated Sludge WWTP
As we all know, there are far too many variables affecting the process, and none of the data have been presented. The temperature of the mixed liquor, alkalinity, available carbon, and other factors have significant impact upon the effectiveness of denitrification.
As stated above, without a dentirification process the expectation for total nitrogen reduction should probably not exceed 25%. However, conversion may occur and if the effluent requirement is only for organic nitrogen limits a plant without denit may be viable.
RE: Effluent Nitrogen in an Activated Sludge WWTP
RE: Effluent Nitrogen in an Activated Sludge WWTP
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RE: Effluent Nitrogen in an Activated Sludge WWTP
RE: Effluent Nitrogen in an Activated Sludge WWTP
We operate an extended aeration ditch on this principal, with 1/3 of the length being mixed, but not aerated whihc gives very good results. If you FST's can handle it, you can up the MLSS in the system to get the same treatment in the remaining aearated sections.
RE: Effluent Nitrogen in an Activated Sludge WWTP