Microbiological evaluation of 5 L- And 20 L-transparent polypropylene buckets for solar water disinfection (SODIS)

Abstract

Background: Solar water disinfection (SODIS) is an appropriate technology for household treatment of drinking water in low-to-middle-income communities, as it is effective, low cost and easy to use. Nevertheless, uptake is low due partially to the burden of using small volume polyethylene terephthalate bottles (1.5-2 L). A major challenge is to develop a low-cost transparent container for disinfecting larger volumes of water. (2) Methods: This study examines the capability of transparent polypropylene (PP) buckets of 5 L- and 20 L- volume as SODIS containers using three waterborne pathogen indicators: Escherichia coli, MS2-phage and Cryptosporidium parvum. (3) Results: Similar inactivation kinetics were observed under natural sunlight for the inactivation of all three organisms in well water using 5 L- and 20 L-buckets compared to 1.5 L-polyethylene-terephthalate (PET) bottles. The PP materials were exposed to natural and accelerated solar ageing (ISO-16474). UV transmission of the 20 L-buckets remained stable and with physical integrity even after the longest ageing periods (9 months or 900 h of natural or artificial solar UV exposure, respectively). The 5 L-buckets were physically degraded and lost significant UV-transmission, due to the thinner wall compared to the 20 L-bucket. (4) Conclusion: This work demonstrates that the 20 L SODIS bucket technology produces excellent bacterial, viral and protozoan inactivation and is obtained using a simple transparent polypropylene bucket fabricated locally at very low cost ($2.90 USD per unit). The increased bucket volume of 20 L allows for a ten-fold increase in treatment batch volume and can thus more easily provide for the drinking water requirements of most households. The use of buckets in households across low to middle income countries is an already accepted practice.

Publication DOI: https://doi.org/10.3390/molecules24112193
Divisions: College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > School of Engineering and Technology > Mechanical, Biomedical & Design
Additional Information: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Funding Information: Funding: This project has received funding from the EU’s Horizon2020 Research and Innovation Program under the WATERSPOUTT Project (grant agreement 688928).
Uncontrolled Keywords: Cryptosporidium,Drinking water,E. coli,Household water treatment and storage,MS2-phage,SODIS,Analytical Chemistry,Chemistry (miscellaneous),Molecular Medicine,Pharmaceutical Science,Drug Discovery,Physical and Theoretical Chemistry,Organic Chemistry
Publication ISSN: 1420-3049
Full Text Link:
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.mdp ... 3049/24/11/2193 (Publisher URL)
PURE Output Type: Article
Published Date: 2019-06-11
Accepted Date: 2019-06-07
Authors: Inmaculada Polo-López, M.
Martínez-García, Azahara
Abeledo-Lameiro, Maria Jesus
Gómez-Couso, Hipolito H.
Ares-Mazás, Elvira E.
Reboredo-Fernández, Aurora
Morse, Tracy D.
Buck, Lyndon (ORCID Profile 0000-0001-7046-5805)
Lungu, Kingsley
McGuigan, Kevin G.
Fernández-Ibáñez, Pilar

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