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

Paper ID Volume ID Publish Year Pages File Format Full-Text
55048 47038 2013 6 PDF Available
Title
Inactivation of Enterococcus faecalis in simulated wastewater treatment plant effluent by solar photo-Fenton at initial neutral pH
Abstract

•Matrix composition has a marked influence on water disinfection by photo-Fenton.•Individual effects of photo-Fenton variables were determined at initial neutral pH.•Detection limit was reached within 40 min in simulated wastewater at neutral pH.•Kinetics were 0.193 and 0.330 min−1 for saline solution and simulated wastewater.

Enterococcus faecalis inactivation was carried out by solar photo-Fenton at initial neutral pH in compound parabolic collectors with 20 mg L−1 of Fe2+ and 50 mg L−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 (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 ± 0.016 min−1 for saline solution with resorcinol, and 0.330 ± 0.019 min−1 for SEWWTP.

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Keywords
Disinfection; Enterococcus faecalis; Neutral pH; Photo-Fenton; Wastewater; Resorcinol
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Inactivation of Enterococcus faecalis in simulated wastewater treatment plant effluent by solar photo-Fenton at initial neutral pH
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 209, 15 June 2013, Pages 195–200
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us