Inactivation of Enterococcus faecalis in simulated wastewater treatment plant effluent by solar photo-Fenton at initial neutral pH

E. Ortega-Gómez, B. Esteban García, M.M. Ballesteros Martín, P Fernandez Ibanez, J.A. Sánchez Pérez

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Abstract

Enterococcus faecalis inactivation was carried out by solar photo-Fenton at initial neutral pH in com- pound parabolic collectors with 20 mg L−1 of Fe2+ and 50 mg L−1 of H2 O2 in different matrices [saline solution (0.9% NaCl), saline solution with resorcinol and a simulated secondary effluent from a munic- ipal 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 H2 O2 (50 mg L−1 ) with solar light decreased E. faecalis concentration from 106 to 102 CFU mL−1 and 1-log for Fenton reaction after 100 min 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 55 min in the saline solution. The presence of resorcinol (Dissolved Organic Carbon: 10 mg L−1 ) reduced the treatment time by 10 min; whilst a 15 min 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 ± 0.005 min−1 for saline solution, 0.294±0.016min−1 forsalinesolutionwithresorcinol,and0.330±0.019min−1 forSEWWTP.
Original languageEnglish
Pages (from-to)195-200
JournalCatalysis Today
Volume209
DOIs
Publication statusAccepted/In press - 12 Mar 2013

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Keywords

  • Disinfection
  • Enterococcus faecalis
  • Neutral pH Photo-Fenton
  • Wastewater
  • Resorcinol

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