“…Complicated sequences of mechanisms (such as exogenous) happen after exposure of contaminated wastewater to sunlight and these sequences can lead to microorganisms’ inactivation ( Wilczewska et al, 2022 ). The rate of inactivation, as well as ultimate microbial concentration, are highly dependent on solar spectral irradiance, the vulnerability of the organisms as well as environmental conditions such as the water quality (i.e., the concentration of other dissolved species) ( Nelson et al, 2018 ; Deshpande et al, 2020 ).…”