Wastewater treatment is strictly regulated in Italy and Europe to prevent the pollution of the natural water bodies. At European level the law was recently updated in the EU directive 2024/3019 of the European Parliament and of the Council of the 27 of November 2024. The majority of the plants for domestic wastewater treatment consist of a conventional activated sludge process (CAS), that comprehends an aerated tank in which the degradation of the organic matter is carried out by microorganisms in steady state conditions. Sequencing Batch Reactor technology emerges as an innovative way to treat wastewater, that switches from a continuous flow to a batch system that evolutes in time and not in space; this helps with process flexibility and allows to avoid the settlers, since sedimentation can occur directly inside the reactor, saving a lot of space and energy.