Fig. 1.

Map of sampling sites. The figure reports a simplified scheme of Padua sewerage system. The city main wastewater treatment plant (WWTP-A) has two separate inlets. The red and pink areas (city center) are served by two district wastewater pumping stations (WPSs), A-U-1 and A-U-2. Especially, A-U-1 drains sewage from the city hospital district. Wastewater from A-U-1 and A-U-2 then merge and reach WWTP-A as a unique influent (A-U-3). The second WWTP_A influent originates from the orange area (site A-U-4). The separate Southern blue area is served by WWTP_B. The plant influent and effluent were sampled (B-U-1 and B-T-1). (Figure adapted from Acegas-Aps-Amga technical sewerage plan, personal communication, 20 April 2020). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)