An Assessment of Continued Use and Health Impact of the Concrete Biosand Filter in Bonao, Dominican Republic

Benjamin A. Aiken Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina; Institute of Public Health, Georgia State University, Atlanta, Georgia

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Christine E. Stauber Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina; Institute of Public Health, Georgia State University, Atlanta, Georgia

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Gloria M. Ortiz Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina; Institute of Public Health, Georgia State University, Atlanta, Georgia

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Mark D. Sobsey Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina; Institute of Public Health, Georgia State University, Atlanta, Georgia

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The biosand filter (BSF) is a promising point of use (POU) technology for water treatment; however there has been little follow-up of initial implementation to assess sustainability. The purpose of this study was to examine continued use, performance, and sustainability of previously implemented concrete BSFs in Bonao, Dominican Republic. Of 328 households visited and interviewed, 90% of BSFs were still in use after approximately 1 year since installation. Water-quality improvement, measured by fecal indicator bacteria reduction, was found to be 84–88%, which is lower than reductions in controlled laboratory studies but similar to other field assessments. In a short prospective cohort study comparing BSF to non-BSF households, odds of reported diarrheal disease in BSF households were 0.39 times the odds of reported diarrheal disease in non-BSF households. These results document high levels of sustained and effective concrete BSF use and associated improvements in water quality and health.

Author Notes

*Address correspondence to Benjamin A. Aiken, Department of Environmental Sciences and Engineering, University of North Carolina—Chapel Hill Gillings School of Global Public Health, CB 7431 Rosenau Hall 148, Chapel Hill, NC 27599-7431. E-mail: benjamin_aiken@med.unc.edu

Financial support: This publication was made possible by the support of the American people through the US Agency for International Development (USAID). It was prepared under the Environmental Health Indefinite Quantity Contract (EHIQC) GHA-I-00-04-00006/Task Order #2, Line Item #3 and managed by CDM International Inc. Laboratory supplies for water-quality testing were donated by IDEXX Laboratories and Hach Company. We are grateful to the Bonao Rotary Club and the Canadian Embassy of the Dominican Republic for their generous financial support of this study.

Authors' addresses: Benjamin A. Aiken and Mark D. Sobsey, Department of Environmental Sciences and Engineering, University of North Carolina—Chapel Hill Gillings School of Global Public Health, Chapel Hill, NC, E-mails: benjamin_aiken@med.unc.edu and mark_sobsey@unc.edu. Christine E. Stauber, Institute of Public Health, Georgia State University, Atlanta, GA, E-mail: cstauber@gsu.edu. Gloria M. Ortiz, Department of Internal Medicine, Bronx Lebanon Hospital Center, Bronx, NY, E-mail: gortiz1@bronxleb.org.

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