Resumo

PEREZ-VIDAL, Andrea; ESCOBAR-RIVERA, Juan Carlos  e  TORRES-LOZADA, Patricia. Risk assessment in water treatment processes for the development of a Water Safety Plan - WSP. Dyna rev.fac.nac.minas [online]. 2018, vol.85, n.206, pp.304-310. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v85n206.65427.

Drinking Water Treatment Plants (DWTP) must ensure safe water supply; to this end, we applied risk assessment tools for the development of the Water Safety Plan (WSP) in a DWTP from Cali-Colombia, which supplies 1.4 million inhabitants. For the identification of hazards and risk assessment, four tools were used: exploratory analysis of turbidity data, inspection visits, hazard/hazardous event matrix and semiquantitative matrix. Under normal and extreme conditions of turbidity (>400 - 2500 UNT), it has been guaranteed the turbidity of treated water of 0.39 ± 0.15 UNT, showing the robustness of the DWTP. It was found that sixty percent of the 40 hazardous events had a very high risk level without considering control measures and it was possible reduce to 7% with existing control measures. The improvement or support programs should be directed towards the treatment phases identified as priority (chemical conditioning, coagulation, flocculation/clarification and filtration).

Palavras-chave : drinking water; hazardous event; hazard identification; water safety plan; risk.

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