Reducing pathogens in combined sewer overflows using performic acid

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• 作者：Katharina Tondera^a ; ^{tondera@isa.rwth-aachen.de" class="auth_mail" title="E-mail the corresponding author} ; Kassandra Klaer^a ; Christoph Koch^b ; Ibrahim Ahmed Hamza^c ; ¹ ; Johannes Pinnekamp^a
• 关键词：Viruses ; Bacteria ; Parasites ; Disinfection ; Combined sewer overflows ; Performic acid
• 刊名：International Journal of Hygiene and Environmental Health
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：219
• 期：7
• 页码：700-708
• 全文大小：1634 K

文摘

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.