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Nitrification is used in both aquaponics and wastewater treatment to convert ammonia to nitrates. This wastewater training video does a good job explaining how nitrification works. One thing to note is that nitrifying bacteria can live suspended in aerated liquid (mixed liquor) as seen in the video or as a biofilm growing on media.

The dissolved oxygen, and pH ranges discussed in the video are for wastewater treatment and not aquaponics. Target values that are commonly used for aquaponics.

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Comment by Izzy on May 25, 2011 at 7:27am
Really great video.  Thank you for sharing! :-)

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