What are some good methods for removing ammonia nitrogen from aquaculture wastewater?
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For the wastewater treatment project we are currently working on, a dry manure removal process is being used; however, the ammonia nitrogen levels never reach the required standards. The process employed consists of hydrolysis acidification + UASB + secondary A/O. The ammonia nitrogen level in the water entering the secondary A/O stage is over 200, and it remains at that level in the effluent as well. The COD level in the water entering the secondary A/O stage is over 2000, while it is around 200 in the effluent. The COD level has decreased, but the ammonia nitrogen hasn’t been removed – what’s going on?
What are the specific operating parameters? Such as residence time, upward flow velocity, and so on. . . It would be better if it were more detailed. . .