A process and apparatus for treating biosolids from biological wastewater treatment. The apparatus comprises a rotary device that is configured to receive the electronic component and a force actuator operative to bias the electronic component into engagement with the rotary device. The two first and the two second cylinder chambers each are connected with one another via an allocated pressurizing medium line. The transition detector is for detecting the transition of the over-sampled signal and outputting a transition signal representing the transition position.