Advanced treatment of urban wastewater by UV-C/free chlorine process: Micro-pollutants removal and effect of UV-C radiation on trihalomethanes formation
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Cerreta, Giusy; Roccamante, Melina Antonella; Plaza Bolaños, Patricia; Oller Alberola, Isabel; Agüera López, Ana María; [et al.]Fecha
2020Resumen
The effect of the UV-C/free chlorine (FC) process on the removal of contaminants of emerging concern (CECs) from real urban wastewater as well as the effect of UV-C radiation on the formation of trihalomethanes (THMs) compared to FC process alone was investigated. Unlike of FC process, UV-C/FC was really effective in the degradation of the target CECs (carbamazepine (CBZ), diclofenac, sulfamethoxazole and imidacloprid) in real wastewater (87% degradation of total CECs within 60 min, QUVC = 1.33 kJ/L), being CBZ the most refractory one (49.5%, after 60 min). The UV-C radiation significantly affected the formation of THMs. THMs concentration (mainly chloroform) was lower in UV-C/FC process after 30 min treatment (<1 μg/L = limit of quantification (LOQ)) than in FC process in dark (2.3 μg/L). Noteworthy, while in FC treated wastewater chloroform concentration increased after treatment, UV-C/FC process resulted in a significant decrease (residual concentrations below the LOQ), even after 2...
Palabra/s clave
Advanced oxidation processes
Contaminants of emerging concern
Disinfection by products
Pesticides
Pharmaceuticals
Wastewater reuse