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Assessment of Nitrogen Reduction Limitations in Aerated Onsite Sewage Treatment Systems

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This study reports on concurrent influent and effluent samples from aerated onsite sewage treatment systems in Florida Keys to assess limitations to nitrogen removal in such systems. Data presented here relate to 24-hour time composite samples, which were collected several times from aerated onsite sewage treatment systems, including from pretreatment tanks or the upstream end of treatment tanks. Different patterns existed for the samples obtained. For the most highly nitrified effluent (14 effluent samples), the median removal was 75% and carbon limitations appeared likely. For the intermediately nitrified effluent (34 samples) the median removal was 44%, and alkalinity or aeration problems may play a role. For the 15 least nitrified effluent samples, the median removal was 28%, and aeration effectiveness appeared to be the biggest issue.

Keywords: Florida Keys; aerobic; aerobic treatment unit; denitrification; nitrification; onsite sewage; septic

Document Type: Research Article


Publication date: January 1, 2010

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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