Oxidation Prolonged with Anoxic (OPANOX)

Anoxic reactor

In this tank the elimination of recirculated nutrients under anoxic conditions (denitrification) is carried out in a biological way.

This tank is equipped with an agitator responsible for facilitating the release of nitrogen gas produced in denitrification. In addition, this tank fulfills the functions of homogenizer of the incoming flow.

Aeration Reactor

Water from the anoxic tank enters the aeration tank (biological treatment) where oxygen is incorporated and mud is recirculated creating an environment conducive to the development of aerobic microbial colonies.

These microorganisms degrade organic and inorganic matter. The oxygen injection is carried out by means of a blower and is distributed by means of a manifold equipped with fine bubble diffusers or by means of an ejector pump.

The commissioning and stopping of this group is automated from the electrical panel

Secondary decanter

After the oxidation of organic matter and the formation of flocs, they settle in the decanter. In this compartment a pump is installed that automatically recirculates the active sludge. Clarified water is collected through a landfill placed at the top.


A sludge purge should be carried out periodically in the reactor to maintain the optimum concentration of active sludge. The periodicity and volume of this purge are determined based on the characteristics of the water to be treated.

Regular maintenance of electromechanical equipment according to manufacturer.