A waste stabilization pond was integrated with a water hyacinth
pond with the goal of reducing nitrogen in the secondary effluent of a
WWTP. The waste stabilization pond supplied oxygen and organics
are essential substances to biological nitrogen removal — to the post
process of the water hyacinth ponds. It can be concluded that the
individual processes worked together successfully.
Nitrification and denitrification rates were strongly affected by
seasonal change, and were 0.04 and 0.02 g/kg day at 20 °C (wet
weight basis), respectively. The temperature-dependent coefficients
Θ were 1.06, which was similar to frequently reported values from
the mechanical biological nitrogen removal literature. Nitrification
and denitrification were expected to occur if the water temperature is
maintained between 20 and 30 °C. As plant density increased,
nitrification and denitrification rates also increased.