Improved O2 control of wastewater plant.

Improved O2 control of wastewater plant.
Result:80% reduction in O2 variationsIn wastewater treatment plants, accurate control of O2 levels is essential. If the O2 levels vary too much, the bacteria in the plant cannot properly do their work,which is to convert organic material into nitrite and nitrate. Up to 2012, the O2 level was controlled by a standard PID controller. To improve control, we implemented the High Performance PID controller in the PLC. The figure below shows measured results of BEFORE (i.e. with standard PID) and AFTER (with High Performance PID). The latter controller is now in use.