The customer had problems with both of their lamella thickeners that they used to separate suspended solids from water. Lamella thickeners are high rate thickeners that use a series of angled impact plates to increase settling rates. The problems for the clients thickener were:
- When the bed level came up to high and entered the plate region the efficiency of the thickener dropped.
- The bed would sometimes break up and flow over into the launders.
- We provided a sonar transducer that would operate under all operating conditions. The sonar monitored the interface bed column and controlled the under flow pump to prevent the bed entering the impact plate region. The sonar was installed with automatic cleaning.
- The sonar transducer can also provide a clarity output like a turbity meter. This alarmed when the bed broke up into pinfloc.