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Int J Hyg Environ Health. 2015 Nov;218(8):731-41. doi: 10.1016/j.ijheh.2015.09.002. Epub 2015 Sep 18.

Reducing pathogens in combined sewer overflows using ozonation or UV irradiation.

Author information

1
Institute of Environmental Engineering of RWTH Aachen University (ISA), 52056 Aachen, Germany. Electronic address: tondera@isa.rwth-aachen.de.
2
Institute of Environmental Engineering of RWTH Aachen University (ISA), 52056 Aachen, Germany.
3
Xylem Services GmbH, Boschstr. 4-14, 32051 Herford, Germany.
4
Biofilm Centre, University Duisburg-Essen, Universitaetsstr. 5, 45141 Essen, Germany.
5
Institute for Hygiene and Public Health (IHPH), Sigmund-Freud-Str. 25, 53105 Bonn, Germany.
6
IWW Rheinisch-Westfaelisches Institut fuer Wasser, Moritzstr. 26, 45476 Muelheim, Germany.
7
Department of Hygiene, Social and Environmental Medicine, Ruhr-University Bochum (RUB), Universitaetsstr. 150, 44801 Bochum, Germany.

Abstract

Fecal contamination of water resources is a major public health concern in densely populated areas since these water bodies are used for drinking water production or recreational purposes. A main source of this contamination originates from combined sewer overflows (CSOs) in regions with combined sewer systems. Thus, the treatment of CSO discharges is urgent. In this study, we explored whether ozonation or UV irradiation can efficiently reduce pathogenic bacteria, viruses, and protozoan parasites in CSOs. Experiments were carried out in parallel settings at the outflow of a stormwater settling tank in the Ruhr area, Germany. The results showed that both techniques reduce most hygienically relevant bacteria, parasites and viruses. Under the conditions tested, ozonation yielded lower outflow values for the majority of the tested parameters.

KEYWORDS:

Bacteria; Disinfection; Log-normal distribution; Monte Carlo simulation; Parasites; Viruses

PMID:
26431869
DOI:
10.1016/j.ijheh.2015.09.002
[Indexed for MEDLINE]

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