Quantitative microbial risk assessment of the micropool in a dry extended detention basin : San Cristobal Park case study (Bogotá, Colombia)

Sustainable Urban Drainage Systems (SUDS) have been implemented to control increasing floods and to improve runoff water quality. However, the quality of water stored in SUDS can be poor and there is a chance that the presence of pathogens in these structures may pose a health risk. In this study a Quantitative Microbial Risk Assessment methodology was applied to determine the risk of infection resulting from exposure to enteric pathogens including Salmonella spp., E. coli O157, and Pseudomonas aeruginosa. For determining some relation with pathogens concentration, meteorological and physicochemical variables were measured at one SUDS structure located in Bogotá, Colombia. This case study was conducted in San Cristobal?s metropolitan park (Bogotá, Colombia), that has a SUDS treatment train that ends in a micropool that stores stormwater runoff, where some children interact with the stored water. To estimate the risk of infection with each pathogen, concentration of the selected microorganisms was measured for 20 weeks in the micropool. Exposure data were determined after observing 78 children interacting in the micropool. The exposure volumes were estimated using data from literature hand-to-mouth contact, ingestion of water droplets and total ingestion. The corresponding daily risk of infection for the mean exposure duration of 6.33 min, selecting hand-to-mouth as the most representative exposure in this study was 0.0023 (95% CI-range 0.000-0.009) of Pseudomonas aeruginosa, 0.601 (95% CI-range 0.346-0.686) for E. coli O157, 0.283 (95% CI-range 0.047-0.416) for Salmonella spp. Also, a significant correlation between precipitation and TSS with pathogens concentration was identified. These results highlight the need to evaluate measures to evaluate micropool management alternatives to reduce exposure to pathogens.

• Autores: Salamanca Rodríguez, Daniela
• Fecha de publicación: 2021
• Institución: Universidad de los Andes
• Repositorio: Séneca: repositorio Uniandes
• Idioma: eng
• OAI Identifier: oai:repositorio.uniandes.edu.co:1992/50939
• Acceso en línea: http://hdl.handle.net/1992/50939
• Palabra clave: Riesgos biológicos; Drenaje; Ingeniería
• Rights: openAccess
• License: https://repositorio.uniandes.edu.co/static/pdf/aceptacion_uso_es.pdf