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Validation of large-volume batch solar reactors for the treatment of rainwater in field trials in sub-Saharan Africa.

journal contribution
posted on 19.10.2020, 14:49 by B Reyneke, T Ndlovu, MB Vincent, A Martínez-García, MI Polo-López, P Fernández-Ibáñez, G Ferrero, S Khan, Kevin McGuigan, W Khan
The efficiency of two large-volume batch solar reactors [Prototype I (140 L) and II (88 L)] in treating rainwater on-site in a local informal settlement and farming community was assessed. Untreated [Tank 1 and Tank 2-(First-flush)] and treated (Prototype I and II) tank water samples were routinely collected from each site and all the measured physico-chemical parameters (e.g. pH and turbidity, amongst others), anions (e.g. sulphate and chloride, amongst others) and cations (e.g. iron and lead, amongst others) were within national and international drinking water guidelines limits. Culture-based analysis indicated that Escherichia coli, total and faecal coliforms, enterococci and heterotrophic bacteria counts exceeded drinking water guideline limits in 61%, 100%, 45%, 24% and 100% of the untreated tank water samples collected from both sites. However, an 8 hour solar exposure treatment for both solar reactors was sufficient to reduce these indicator organisms to within national and international drinking water standards, with the exception of the heterotrophic bacteria which exceeded the drinking water standard limit in 43% of the samples treated with the Prototype I reactor (1 log reduction). Molecular viability analysis subsequently indicated that mean overall reductions of 75% and 74% were obtained for the analysed indicator organisms (E. coli and enterococci spp.) and opportunistic pathogens (Klebsiella spp., Legionella spp., Pseudomonas spp., Salmonella spp. and Cryptosporidium spp. oocysts) in the Prototype I and II solar reactors, respectively. The large-volume batch solar reactor prototypes could thus effectively provide four (88 L Prototype II) to seven (144 L Prototype I) people on a daily basis with the basic water requirement for human activities (20 L). Additionally, a generic Water Safety Plan was developed to aid practitioners in identifying risks and implement remedial actions in this type of installation in order to ensure the safety of the treated water.

Funding

WATERSPOUTT Water - Sustainable Point-Of-Use Treatment Technologies | Funder: EU Horizon 2020 | Grant ID: H2020-2016-RIA-688928-2

History

Comments

The original article is available at www.elsevier.com

Published Citation

Reyneke B, Ndlovu T, Vincent MB, Martinez-Garcia A, Polo-Lopez MI, Fernandez-Ibanez P, Ferrero G, Khan S, McGuigan KG, Khan W. Validation of large-scale solar reactors for the treatment of rainwater in field trials in sub-Saharan Africa. Science of the Total Environment. 2020; 717: 137223

Publication Date

15 May 2020

PubMed ID

32062239

Department/Unit

  • Physiology and Medical Physics

Research Area

  • Population Health and Health Services

Publisher

Elsevier BV

Version

  • Accepted Version (Postprint)

Exports