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Oxygen Transport through Selected Aquatic Macrophytes

Univ. of Florida, Inst. of Food and Agric. Sci., Soil Sci. Dep., Gainesville, FL 32611.

^* Corresponding author.

ABSTRACT

The extent of O₂ transport from aerial plant tissue into the root zone was evaluated for several floating and emergent aquatic macrophytes that have characteristics favorable for wastewater treatment. The highest O₂ transport rates from aerial tissue into the root zone were associated with plants having a small root mass. As root mass increased, the rate of O₂ transport decreased for aquatic macrophytes evaluated. Pennywort (Hydrocotyle umbellata L.) had the highest O₂ transport rate of all aquatic macrophytes with an overall rate of 3.49 g O₂ kg^–1 dry root mass h^–1. Pickerelweed (Pontederia cordata L.) had the highest O₂ transport capacity of emergent plants with a rate of 1.54 g O₂ kg^–1 h^–1. Waterhyacinth [Eichhornia crassipes (Mart.) Sollms], an important floating aquatic plant in wastewater treatment, had a transport rate of 1.24 g O₂ kg^–1 h^–1. Nitrification in a waterhyacinth-based water treatment system due to O₂ transport was calculated to vary from 6 to 22 kg ha^–1 d^–1.

Key Words: Emergent aquatic plants • Floating aquatic plants • Wastewater treatment • Nitrification • BOD₅ reduction

Florida Agric. Exp. Stn. Journal Series no. 8438.

Received for publication February 25, 1987.

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