This method describes how to measure the surface tension of wastewater using a tensiometer.
Wastewater generated in the industrial production of beer and food
The force measured in this analysis is exerted by the surface tension. The surface tension can be measured either as the force on a plate oriented perpendicular to the surface of the liquid and thoroughly wetted by it (static method) or the force that is required in order to pull out a horizontally suspended rod or ring from the liquid surface (quasi-static method).