Upper limits for ammonia nitrogen and sodium salts in biochemical systems
Thread Content
Is it correct that the upper limits for ammonia nitrogen and sodium salts in the wastewater fed into the biochemical system are 1000 mg/L and 100 mg/L respectively?
In my opinion, the upper limit for ammonia nitrogen is closely related to BOD5; if it’s possible to maintain a C/N ratio of more than 4, then the ammonia nitrogen level can be a bit higher. However, based on my experience, I have only worked with levels of 300 PPm – under conditions where methanol is added and the nitrification rate is maintained, operation is still possible, but levels higher than that would likely present difficulties, as it would be hard to meet the required standards. For sodium salts, it depends on whether they are monovalent or divalent; the combined amount should not exceed 1.5% (in terms of salt content), and this has little impact on activated sludge, allowing for normal operation.