The use of natural wetlands for treatment of wastewater has
been practiced for several decades in the past [1]. Since the
1950s, the wetland technology emerged and the use of controlled
wetland environments for wastewater treatment was developed.
Constructed wetlands (CWs) appear nowadays as a reliable, effective
and feasible solution in the field of wastewater treatment [2,3].
They can be classified by the type of plants (free floating, rooted
emergent and submerged systems) or by the type of flow (horizontal
or vertical)