“…Venlafaxine degradation is a function of contradicting factors in real effluents. On the antagonists of the process, we can mention the (i) suspended solids, blocking UV and solar light transmission, (ii) the Effluent Organic Matter (EfOM), consisting in still particulate organic matter (POM), biodegradable organic matter, refractory organic matter and other MPs, which all compete for the oxidants generated by AOPs [19] and screen the light [30], (iii) the ROS scavengers, such as (bi)carbonates, nitrate and nitrite [31], and (iv) the microorganisms. On the other hand, the very presence of some substances has been proven to enhance the self-purification capabilities of the effluents, such as (a) the presence of photo-sensitizable organic matter (PhOM), which further produces ROS, and (b) the nitrates and the carbonates, which contribute in producing nitrate radicals, carbonate radicals and ROS, all with mild oxidative potential [19].…”