Está formado por canales con la superficie del agua expuesta a la atmósfera y el fondo constituido por suelo relativamente impermeable, o con una cubierta impermeable, vegetación emergente y niveles de agua poco profundos que oscilan entre 0.1 y 0.6 metros (Ñique, 2004). El tratamiento se produce durante la circulación lenta del agua a través de los tallos y raíces de la vegetación.
Este sistema se puede dividir, de acuerdo con el tipo de macrófitas (CIEMA, 2005), en:
Sistemas con macrófitas flotantes: formados por grandes lagunas con bajos niveles de agua y provistas de plantas macrófitas que flotan libremente en la superficie. Sus raíces sumergidas tienen un buen desarrollo.
Sistemas con macrófitas sumergidas: compuestos por lagunas con bajo nivel de agua y plantadas con plantas macrófitas cuyo tejido fotosintético está totalmente sumergido. Estas plantas requieren oxígeno disuelto para su correcto crecimiento, por lo cual no se utilizan para aguas residuales con alto contenido de materia orgánica biodegradable ya que la descomposición microbiana provoca condiciones anóxicas
Autor: ANDRE CASTILLA GUTIERREZ
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