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Influence of the Water Louse, Asellus Aquaticus, on Bacterial Survival in Drinking Water Systems

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DTU Environment
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Influence of the Water Louse, Asellus Aquaticus, on Bacterial Survival in Drinking Water Systems Influence of the water louse, Asellus aquaticus, on bacterial survival in drinking water systems AWWA Water Quality Technology Conference 5th of November 2013 Sarah C.B. Christensen, DTU Environment Hans-Jørgen Albrechtsen, DTU Environment Erik Arvin, DTU Environment Erling Nissen, VCS Denmark 2013 © American Water Works Association AWWA WQTC Conference Proceedings All Rights Reserved Background • Invertebrates • Present in water distribution systems worldwide (WHO, 2004) • Hosts for parasites • Aesthetic problems • Effects on microbial drinking waterquality? (WHO, 2004: Safe piped water: managing microbial water quality in piped distribution systems) 2 2013 © American Water Works Association AWWA WQTC Conference Proceedings All Rights Reserved Asellus aquaticus • Often constitute the largest biomass in drinking water systems (up to 1 cm long) • Distributed throughout temperate parts of the northern hemisphere • Natural fresh water and sea water habitats (up to 2 cm) • Omnivor/detritivor shredder • Sexual reproduction – offspring carried by the female until 1-2 mm long • Grazing on or protection of bacteria never investigated 5 mm5 mm 3 Photo: G.A. Wilczorek 2013 © American Water Works Association AWWA WQTC Conference Proceedings All Rights Reserved Ways of invertebrate entry 4 S.C.B. Christensen 2011 2013 © American Water Works Association AWWA WQTC Conference Proceedings All Rights Reserved Invertebrates and bacteria in drinking water systems and natural freshwater environments • Distribution system in USA: Amphipods, insect larvae and copepods homogenised – no pathogens or coliform bacteria • Raw water and treated surface water samples from Italy: nematodes with associated (internal) non-pathogenic enterobacteria • One copepod with associated V

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