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Occurrence and removal efficiency of parasitic protozoa in Swedish wastewater treatment plants
Linköping University, Department of Clinical and Experimental Medicine, Division of Microbiology and Molecular Medicine. Linköping University, Faculty of Medicine and Health Sciences.
County Hospital Ryhov, Sweden.
Chalmers, Sweden.
County Hospital Ryhov, Sweden.
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2017 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 598, 821-827 p.Article in journal (Refereed) Published
Abstract [en]

Giardia intestinalis, Cryptosporidium spp., Entamoeba histolytica and Dientamoeba fragilis are parasitic protozoa and causative agents of gastroenteritis in humans. G. intestinalis and Cryptosporidium spp. in particular are the most common protozoa associated with waterborne outbreaks in high-income countries. Surveillance of protozoan prevalence in wastewater and evaluation of wastewater treatment removal efficiencies of protozoan pathogens is therefore imperative for assessment of human health risk. In this study, influent and effluent wastewater samples from three wastewater treatment plants in Sweden were collected over nearly one year and assessed for prevalence of parasitic protozoa. Quantitative real-time PCR using primers specific for the selected protozoa Cryptosporidium spp., G, intestinalis, E. histolytica, Entamoeba dispar and D. fragilis was used for protozoan DNA detection and assessment of wastewater treatment removal efficiencies. Occurrence of G. intestinalis, E. dispar and D. fragilis DNA was assessed in both influent (44, 30 and 39 out of 51 samples respectively) and effluent wastewater (14, 9 and 33 out of 51 samples respectively) in all three wastewater treatment plants. Mean removal efficiencies of G. intestinalis, E. dispar and D. fragilis DNA quantities, based on all three wastewater treatment plants studied varied between 67 and 87%, 37-75% and 20-34% respectively. Neither E. histolytica nor Cryptosporidium spp. were detected in any samples. Overall, higher quantities of protozoan DNA were observed from February to June 2012. The high prevalence of protozoa in influent wastewater indicates the need for continued monitoring of these pathogens in wastewater-associated aquatic environments to minimise the potential risk for human infection. (C) 2017 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 598, 821-827 p.
Keyword [en]
Parasitic contamination; Giardia; Entamoeba; Dientamoeba; Removal efficiency
National Category
Water Treatment
Identifiers
URN: urn:nbn:se:liu:diva-139377DOI: 10.1016/j.scitotenv.2017.04.015ISI: 000404504000083PubMedID: 28458199OAI: oai:DiVA.org:liu-139377DiVA: diva2:1129882
Note

Funding Agencies|VISK project within European Union program Interreg IV A Oresund-Kattegat-Skagerrak [00148715]; Division of Medical Services at County Hospital Ryhov, Jonkoping

Available from: 2017-08-07 Created: 2017-08-07 Last updated: 2017-08-07

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Berglund, BjörnLindgren, Per-Eric
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