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Evaluation of a silver-ion based purification system for rainwater harvesting at a small-scale community level

Adler, I; Hudson-Edwards, KA; Campos, LC; (2013) Evaluation of a silver-ion based purification system for rainwater harvesting at a small-scale community level. Journal of Water Supply: Research and Technology - AQUA , 62 (8) 545 - 551. 10.2166/aqua.2013.049. Green open access

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Abstract

Silver has been known for centuries to be a powerful disinfectant, with no known harmful effects to humans if applied in adequate doses. Although its use was partially discontinued with the advent of chlorination and modern antibiotics, the discovery of bacterial resistance and disinfection by-products has enabled its re-emergence as a viable water purification option. On the other hand, implementation in small-scale rainwater harvesting (RWH) systems has received little attention, possibly due to a general perception that it is a complex and/or expensive technology. This can be overcome by efficient designs that dose silver ions into the water at a minimal cost. The authors evaluated a dozen RWH systems equipped with silver releasing devices, which have been providing drinking water to schools and clinics in a rural area of Mexico. This paper represents a follow-up to a previously published study on an evaluation performed in the same region. A number of water quality parameters have been analysed, examining the long-term efficiency of the projects. Our observations show that the silver ion devices act as an effective disinfection mechanism, as long as adequate maintenance is provided. The combination with conventional settling tanks and filtration units seems to greatly enhance the overall performance of the system.

Type: Article
Title: Evaluation of a silver-ion based purification system for rainwater harvesting at a small-scale community level
Open access status: An open access version is available from UCL Discovery
DOI: 10.2166/aqua.2013.049
Publisher version: http://dx.doi.org/10.2166/aqua.2013.049
Language: English
Additional information: This is the authors' accepted version of this article. © IWA Publishing 2013. The definitive peer-reviewed and edited version of this article is published in Journal of Water Supply: Research and Technology — AQUA Vol 62 No 8 pp 545–551 [doi:10.2166/aqua.2013.049] and is available at www.iwapublishing.com.
Keywords: disinfection, drinking water, rainwater harvesting, silver ions, sustainable development
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1421181
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