Priority areas for the use of solar water disinfection (SODIS) in Brazil: a spatial approach

• Published in: Journal of water, sanitation, and hygiene for development Vol. 14; no. 10; pp. 950 - 962
• Main Authors: Kondo Nakada, Liane Yuri, Urban, Rodrigo Custodio
• Format: Journal Article
• Language: English
• Published: London IWA Publishing 01-10-2024
• Subjects: Arid zones; Disinfection; Economics; Irradiance; Pathogens; Polyethylene terephthalate; Radiation; Semi arid areas; Semiarid lands; Solar energy; Solar radiation; Sun; Water; Water resources; Water security; Water shortages; Water treatment; Brazil
• ISSN: 2043-9083; 2408-9362
• DOI: 10.2166/washdev.2024.129

This paper presents a methodology for the development of a potential and priority use map for the application of the solar water disinfection (SODIS) method in Brazil. The assessment of solar radiation was conducted, with a particular focus on the annual average global horizontal irradiance (GHI). The water vulnerability index (WVI) and the economic-social-ecosystemic (ESE)-WVI were developed and employed as indicators to define the priority regions for the application of SODIS. The combination of the GHI and WVI maps yielded a SODIS usage potential index (SUPI). The combination of the SUPI map with information pertaining to the human, economic, and ecosystem dimensions of water vulnerability (ESE-WVI) yielded the SODIS usage priority index. The analysis revealed that the country exhibits favorable levels of solar radiation, making the implementation of SODIS a viable option, particularly in the Northeast region. Furthermore, the study identified regions with greater water vulnerability, such as the semi-arid region and some parts of the Amazon, as priorities for the application of SODIS. In conclusion, SODIS represents a viable water treatment technique for various regions in Brazil, particularly those with abundant solar radiation and concerns regarding water security.