Fig. 3. Nitrogen and phosphorus removal coefficients of duckweed-covered wastewater in dependence of the initial nutrient concentrations (85, 72, 46, 25, and 12 mg Kjeldahl N L^-1 and 14, 10, 4, 2, and 1 mg total P L^-1). One data point was excluded for the curve fit of Kjeldahl N. Data from Körner and Vermaat (1998).

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