• Case Studies

Monitoring of a flotation in water treatment facility


The feed and operating conditions of an industrial water treatment facility vary considerably. Disturbances in the main process are reflected in the effluent and seasonal variation of ambient temperature creates additional challenge in the operation. To optimize the flotation phase, real-time information of key process parameters, such as bubble size distribution and flocculation efficiency is needed.


A custom Pixact Bubble Monitoring (PBM) system was developed to produce real time-measurement data from an open flotation tank. The imaging unit is submersed in two meters depth in the flotation tank to monitor the bubble and flock size distribution as the air feed, chemical dosage and other process parameters are varied.


The effect of the mixing speed, air feed and flocculant dosage are studied to find the optimal flotation conditions for given effluent characteristics.

Process parameters

Process  Flotation in water treatment
Bubble size distribution 5µm…100µm
Flock size distribution 50µm…5000µm
Temperature 10-20°C
Pressure Atm