Aquatic plant system has been accounted as
one of the processes for wastewater recovery and
recycling. The main purposes of using this system
have focused on waste stabilization and nutrient
removal. The principal removal mechanisms are
physical sedimentation and bacterial metabolic
activity as in the conventional activated sludge and
trickling filter (USEPA, 1991). Plant assimilation
of nutrients and its subsequent harvesting are
another mechanism for pollutant removal. Low
cost and easy maintenance make the aquatic plant
system attractive to use. Thus, constructed ponds
with aquatic plants are increasingly applied as a
viable treatment for municipal wastewater. However,
there are some constraints with using aquatic
plants such as the requirement for large area of
land, the reliability for pathogen destruction, and
the types and end-uses of aquatic plants.