The wastewater treatment plant serving the municipalities of San Severo and Torremaggiore needed an upgrade in order to comply with new regulations on wastewater monitoring and disposal. The project involves the demolition of the operational units in the process chain that are no longer in functional order to make room for new treatment sections for the plant. One of the first interventions focuses on the sewage arrival channel, which will be relocated; subsequently, a new lifting system will be built to carry the sewage flowing in from the new screening section to the next sand removal unit. The equalization tank will be demolished and replaced by a new one, in full compliance with current regional regulations. Therefore, each equalization tank includes a lifting station with the installation of 2+2 submersible electric pumps, capable of lifting the minimum and maximum flow rates (which vary constantly throughout the day) arriving at the plant.

The project also includes the creation of a new distributor to the primary sedimentation, the building of a PAC dosing station, the renovation of the overhead cranes for the primary sedimentation tanks and a collection well, capable of lifting the effluent sewage from the primary sedimentation.

The supply and installation of piping to feed the new conventional biological line has also been planned. The project also includes the creation of a new room, adjacent to the new biological line, for the accommodation of 5 blowers that service the existing lines; moreover, analyses will be made to allocate the most appropriate portion of  the room to the installation of electrical panels. Measures will be taken to reduce the concentration of phosphorus in the output, within the limitations set by law. Works will also be carried out on the secondary sedimentation section, i.e. the component of the plant which decants the mixture of water and biological sludge from the biological lines.

In order to guarantee a purified effluent at the outlet that would comply with preset discharge limits, it will be necessary to upgrade the existing sedimentation compartment by installing a new debacterization system: it will be independently equipped with its own sludge well for lifting the recirculation wastewater and excess sludge.

As for the sludge line, the overhead cranes will be renovated, a dynamic sludge thickening apparatus will be installed, the existing centrifugal extractors will be moved and newly fitted for use, a sludge evacuation system will be installed and two new accesses to the sludge treatment room will be built to facilitate the maneuvering and maintenance phases. All structures that will be built have been appropriately sized in order to be safe in case of permanent and accidental loads that may occur during their functional period; the design has been set to ensure that, during the machinery service life, the structures and materials keep peak performance, while maintaining a high level of safety and functional efficiency for the project.

In order to contain odour emissions from the treatment plant, spent air will be funnelled and treated, with the inclusion of air bio-filtration systems. Thanks to the planned interventions, the new project chain of the San Severo treatment plant will be able to return a treated effluent adequate, in line with the limits set by regulations, for its dispersion in soil, as well as for reuse in agriculture.