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SL348: Onsite Sewage Treatment and Disposal Systems: Nitrogen

Figure 1. The Nitrogen Cycle. Bacteria that naturally decompose organic material are used in the septic tank to begin the treatment process, which continues in the drain field through processes of nitrification, denitrification, and plant assimilation. (Source: Wikimedia Commons, http://en.wikipedia.org/wiki/File:Nitrogen_Cycle.svg).