Abstract
Enterococcus faecalis inactivation was carried out by solar photo-Fenton at initial neutral pH in compound parabolic collectors with 20mgL−1 of Fe2+ and 50mgL−1 of H2O2 in different matrices [saline solution (0.9% NaCl), saline solution with resorcinol and a simulated secondary effluent from a municipal wastewater treatment plant (SEWWTP)]. The effects of mechanical stress, acidic pH, solar light, solar light/H2O2 and Fenton reaction were determined. Sunlight led to a 2-log bacterial decrease while H2O2 (50mgL−1) with solar light decreased E. faecalis concentration from 106 to 102CFUmL−1 and 1-log for Fenton reaction after 100min of treatment. The chemical composition of water matrix was shown to have a marked influence on E. faecalis inactivation by solar photo-Fenton. The detection limit was reached within 55min in the saline solution. The presence of resorcinol (Dissolved Organic Carbon: 10mgL−1) reduced the treatment time by 10min; whilst a 15min reduction was observed in SEWWTP and the final pH returned to neutral. E. faecalis inactivation results were satisfactorily fitted to a modified version of the classical Chick–Watson model. The kinetic constants were 0.193±0.005min−1 for saline solution, 0.294±0.016min−1 for saline solution with resorcinol, and 0.330±0.019min−1 for SEWWTP.
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