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Engenharia Sanitaria e Ambiental

versão impressa ISSN 1413-4152versão On-line ISSN 1809-4457

Resumo

OLIVEIRA, Keila Castro; BASTOS, Rafael Kopschitz Xavier  e  SILVA, Carolina Ventura da. Are aerobic spore-forming bacteria good indicators of water treatment efficiency? An explanatory study. Eng. Sanit. Ambient. [online]. 2018, vol.23, n.6, pp.1103-1109. ISSN 1413-4152.  http://dx.doi.org/10.1590/s1413-41522018151590.

The results of monitoring aerobic spore-forming bacteria in a field-scale conventional water treatment plant are presented and discussed herein. Spores were consistently and effectively removed throughout the treatment steps, totaling approximately 3 log-unit complete removal. The clarification steps (sedimentation + filtration) accounted for most of the spore removal: 0.65 log by sedimentation and 1.71 log by filtration - average values. Although the spores proved to be rather resistant to chlorination, a 0.8 log-unit reduction by inactivation was achieved. It is suggested that spores of aerobic spore-forming bacteria are useful indicators for evaluating overall water treatment plant performance (clarification and disinfection by chlorination), and can potentially be used as removal/inactivation indicators (clarification and disinfection by chlorination) of Giardia cysts, and removal by clarification of Cryptosporidium oocysts.

Palavras-chave : aerobic bacteria spores; protozoa; drinking-water treatment.

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