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A plant reports a sudden drop in CBOD5 while total BOD5 remains stable. The nitrification inhibitor bottle was replaced last week, seed correction is normal, and effluent ammonia is elevated. Which interpretation best fits the data?
The aeration basin has eliminated carbonaceous loading but not nitrogenous loading.
The seed correction must be ignored whenever ammonia is present.
The total BOD bottles were incubated at the wrong temperature by definition.
The CBOD inhibitor is suppressing nitrogenous demand, so BOD and CBOD are measuring different oxygen demands.
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