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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.
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