Korsten, Lise, Duvenage, Stacey ORCID: 0000-0002-5984-1491 and van der Merwe, Venessa (2013) Comparison of biofilm formation and water quality when water from different sources was stored in large commercial water storage tanks. Journal of Water and Health, 11 (1). pp. 30-40. ISSN 1477-8920 (Print), London and Geneva (Online) (doi:https://doi.org/10.2166/wh.2012.014)

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Abstract

Rain-, ground- and municipal potable water were stored in low density polyethylene storage tanks for a period of 90 days to determine the effects of long-term storage on the deterioration in the microbial quality of the water. Total viable bacteria present in the stored water and the resultant biofilms were enumerated using heterotrophic plate counts. Polymerase chain reaction (PCR) and Colilert-18® tests were performed to determine if the faecal indicator bacteria Escherichia coli was present in the water and in the biofilm samples collected throughout the study. The municipal potable water at the start of the study was the only water source that conformed to the South African Water Quality Guidelines for Domestic Use. After 15 days of storage, this water source had deteriorated microbiologically to levels considered unfit for human consumption. E. coli was detected in the ground- and potable water and ground- and potable biofilms periodically, whereas it was detected in the rainwater and associated biofilms at every sampling point. Imperfections in the UV resistant inner lining of the tanks were shown to be ecological niches for microbial colonisation and biofilm development. The results from the current study confirmed that long-term storage can influence water quality and increase the number of microbial cells associated with biofilms on the interior surfaces of water storage tanks.

Item Type:	Article
Uncontrolled Keywords:	biofilm, rainwater harvesting, water-borne pathogens, water storage
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > QR Microbiology S Agriculture > SH Aquaculture. Fisheries. Angling
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Natural Resources Institute Faculty of Engineering & Science > Natural Resources Institute > Food & Markets Department
Related URLs:	Publisher
Last Modified:	11 Aug 2021 10:31
URI:	http://gala.gre.ac.uk/id/eprint/33537

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