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Inactivation of enteric microorganisms with chemical disinfectants, UV irradiation and combined chemical/UV treatments.
Water Res. 2005 Apr; 39(8):1519-26.WR

Abstract

The relative disinfection efficiencies of peracetic acid (PAA), hydrogen peroxide (H2O2) and sodium hypochlorite (NaOCl) against Escherichia coli, Enterococcus faecalis, Salmonella enteritidis and coliphage MS2 virus were studied in laboratory-scale experiments. This study also evaluated the efficiency of combined PAA/ultraviolet irradiation (UV) and H2O2/UV treatments to determine if the microbial inactivation was synergistic. Microbial cultures were added into a synthetic wastewater-like test medium and treated by chemical disinfectants with a 10 min contact time, UV irradiation or the combination of chemical and UV treatments. A peracetic acid dose of 3 mg/l resulted in approximately 2-3 log enteric bacterial reductions, whereas 7-15 mg/l PAA was needed to achieve 1-1.5 log coliphage MS2 reductions. Doses of 3-150 mg/l hydrogen peroxide achieved below 0.2 log microbial reductions. Sodium hypochlorite treatments caused 0.3-1 log microbial reductions at an 18 mg/l chlorine dose, while 2.6 log reductions of E. faecalis were achieved at a 12 mg/l chlorine dose. The results indicate that PAA could represent a good alternative to chlorine compounds in disinfection procedures, especially in wastewaters containing easily oxidizable organic matter. Hydrogen peroxide is not an efficient disinfectant against enteric microorganisms in wastewaters. The combined PAA/UV disinfection showed increased disinfection efficiency and synergistic benefits with all the enteric bacteria tested but lower synergies for the coliphage MS2. This suggests that this method could improve the efficiency and reliability of disinfection in wastewater treatment plants. The combined H2O2/UV disinfection only slightly influenced the microbial reductions compared to UV treatments and showed some antagonism and no synergies.

Authors+Show Affiliations

Koivunen J
Department of Environmental Sciences, University of Kuopio, POB 1627, FIN-70211 Kuopio, Finland. jari.koivunen@uku.fi
Heinonen-Tanski H
No affiliation info available

MeSH

DisinfectantsDisinfectionEnterococcus faecalisEscherichia coliHydrogen PeroxideLevivirusOxidantsPeracetic AcidSalmonella enteritidisSodium HypochloriteUltraviolet RaysWater Purification

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15878023

Citation

Koivunen, J, and H Heinonen-Tanski. "Inactivation of Enteric Microorganisms With Chemical Disinfectants, UV Irradiation and Combined chemical/UV Treatments." Water Research, vol. 39, no. 8, 2005, pp. 1519-26.
Koivunen J, Heinonen-Tanski H. Inactivation of enteric microorganisms with chemical disinfectants, UV irradiation and combined chemical/UV treatments. Water Res. 2005;39(8):1519-26.
Koivunen, J., & Heinonen-Tanski, H. (2005). Inactivation of enteric microorganisms with chemical disinfectants, UV irradiation and combined chemical/UV treatments. Water Research, 39(8), 1519-26.
Koivunen J, Heinonen-Tanski H. Inactivation of Enteric Microorganisms With Chemical Disinfectants, UV Irradiation and Combined chemical/UV Treatments. Water Res. 2005;39(8):1519-26. PubMed PMID: 15878023.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Inactivation of enteric microorganisms with chemical disinfectants, UV irradiation and combined chemical/UV treatments. AU - Koivunen,J, AU - Heinonen-Tanski,H, Y1 - 2005/03/23/ PY - 2004/08/31/received PY - 2004/12/03/revised PY - 2005/01/25/accepted PY - 2005/5/10/pubmed PY - 2005/9/27/medline PY - 2005/5/10/entrez SP - 1519 EP - 26 JF - Water research JO - Water Res VL - 39 IS - 8 N2 - The relative disinfection efficiencies of peracetic acid (PAA), hydrogen peroxide (H2O2) and sodium hypochlorite (NaOCl) against Escherichia coli, Enterococcus faecalis, Salmonella enteritidis and coliphage MS2 virus were studied in laboratory-scale experiments. This study also evaluated the efficiency of combined PAA/ultraviolet irradiation (UV) and H2O2/UV treatments to determine if the microbial inactivation was synergistic. Microbial cultures were added into a synthetic wastewater-like test medium and treated by chemical disinfectants with a 10 min contact time, UV irradiation or the combination of chemical and UV treatments. A peracetic acid dose of 3 mg/l resulted in approximately 2-3 log enteric bacterial reductions, whereas 7-15 mg/l PAA was needed to achieve 1-1.5 log coliphage MS2 reductions. Doses of 3-150 mg/l hydrogen peroxide achieved below 0.2 log microbial reductions. Sodium hypochlorite treatments caused 0.3-1 log microbial reductions at an 18 mg/l chlorine dose, while 2.6 log reductions of E. faecalis were achieved at a 12 mg/l chlorine dose. The results indicate that PAA could represent a good alternative to chlorine compounds in disinfection procedures, especially in wastewaters containing easily oxidizable organic matter. Hydrogen peroxide is not an efficient disinfectant against enteric microorganisms in wastewaters. The combined PAA/UV disinfection showed increased disinfection efficiency and synergistic benefits with all the enteric bacteria tested but lower synergies for the coliphage MS2. This suggests that this method could improve the efficiency and reliability of disinfection in wastewater treatment plants. The combined H2O2/UV disinfection only slightly influenced the microbial reductions compared to UV treatments and showed some antagonism and no synergies. SN - 0043-1354 UR - https://www.unboundmedicine.com/medline/citation/15878023/Inactivation_of_enteric_microorganisms_with_chemical_disinfectants_UV_irradiation_and_combined_chemical/UV_treatments_ DB - PRIME DP - Unbound Medicine ER -