Model 2 Nitrogen Removal in Facultative Lagoons Complete Mix Model

where:

Ne = effluent total nitrogen (mg/L) N0 = influent total nitrogen (mg/L) t = detention time (d) T = temperature of pond water (°C) pH = pH of near-surface bulk liquid

Use the Mancini and Barnhart (1976) equation to determine lagoon water temperature:

where:

A = surface area of pond (m3) Ta = ambient air temperature (°C) T = influent temperature (°C) Q = influent flow rate (m3/d)

Source: Middlebrooks, E.J., Nitrogen removal model developed for U.S. Environmental Protection Agency, Washington, D.C., 1985.

FIGURE 4.29 Predicted vs. actual effluent nitrogen for Peterborough, New Hampshire. © 2006 by Taylor & Francis Group, LLC

Month

FIGURE 4.29 Predicted vs. actual effluent nitrogen for Peterborough, New Hampshire. © 2006 by Taylor & Francis Group, LLC

Measured Effluent Nitrogen (Total N, mg/L) FIGURE 4.30 Verification of design models.
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