Journal article
Reducing pathogens in combined sewer overflows using performic acid
International Journal of Hygiene and Environmental Health, Vol.219(7), pp.700-708
2016
Abstract
Combined sewer overflows contribute significantly to pathogen loads in surface water. Some chemical disinfectants such as chlorine have proved to reduce the levels of microorganisms even in complex matrices such as wastewater in combined sewer systems; however, some of them release toxic by-products into water bodies and increase costs of plant maintenance and repair. In this study, we determined if performic acid (PFA) disinfection units can be operated at decentralized treatment facilities and reduce bacteria, viruses, and protozoan parasites in combined sewer overflows (CSOs). The PFA dosing unit at the inflow of a CSO storage tank dosed a fixed flow volume into the inflowing stormwater and, thus, concentrations varied between approximately 12-24 mg l-1. The results showed a reduction of most hygienically relevant bacteria with mean removal efficiencies of 1.8 log10 for Aeromonas spp. and 3.1 log10 for E. coli. For viruses, however, reduction was only observed for somatic coliphages with 2.7 log10. In this setting, PFA does not seem to be suitable to remove e.g. protozoan parasites such as Giardia lamblia. In terms of operation, dosing the substance is uncritical in decentralized facilities, but the PFA needs too much time to react with pathogens after being dosed into the overflow of CSO storage tanks and before dilution with surface water in most facilities. © 2016 Elsevier GmbH
Details
- Title
- Reducing pathogens in combined sewer overflows using performic acid
- Authors
- Katharina Tondera (Author) - Institute of Environmental Engineering of RWTH Aachen University (ISA), GermanyK Klaer (Author) - Institute of Environmental Engineering of RWTH Aachen University (ISA), GermanyC Koch (Author) - University of Bonn, GermanyI A Hamza (Author) - Ruhr-University Bochum (RUB), GermanyJ Pinnekamp (Author) - Institute of Environmental Engineering of RWTH Aachen University (ISA), Germany
- Publication details
- International Journal of Hygiene and Environmental Health, Vol.219(7), pp.700-708
- Publisher
- Elsevier GmbH - Urban und Fischer
- Date published
- 2016
- DOI
- 10.1016/j.ijheh.2016.04.009
- ISSN
- 1438-4639
- Organisation Unit
- University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99451055102621
- Output Type
- Journal article
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