Corrigendum: Water Science and Technology 83 (12), 3007–3019: A simple and reliable proposal to determine the technical feasibility of biogas use and the energetic self-sustainability in UASB-based sewage treatment plants, Tayane Cristiele Rodrigues Mesquita, Izabelle de Paula Sousa, Maria Fernanda Antunes Collares and André Pereira Rosa, doi: 10.2166/wst.2021.189 (IWA Publishing, 2021)