Use of the coagulation diagrams as a tool for studing the removal of Cryptosporidium sp.p e Giardia spp. in public water supply

Main Article Content

Danielle Segóvia C. A. Pereira
https://orcid.org/0009-0007-4074-1910
Elizabeth R. Halfeld da Costa
https://orcid.org/0000-0003-4007-4162
Regina de Pinho Keller
https://orcid.org/0000-0002-9163-0715
Edumar Ramos Cabral Coelho
https://orcid.org/0000-0002-9220-5737

Abstract

Protozoa of the genera Cryptosporidium and Giardia are responsible for outbreaks of waterborne diseases, including in developed countries, which reveals the difficulty of their removal through the water treatment normally used. In Brazil, the most used water treatment technology is the complete cycle type, which consists of the sequential stages of coagulation, flocculation, decantation, filtration and disinfection. The study evaluated the removal of Cryptosporidium spp. oocysts and Giardia spp. cysts in waters from the Jucu River, a station that supplies a full cycle station, based on the coagulation diagram. The research consisted of physical-chemical and biological characterization using three types of water collected from the Jucu River. For each type of water, a coagulation diagram was constructed using aluminum sulfate as a coagulant in the scanning mechanism. To carry out studies with inoculum of Cryptosporidium and Giardia (oo) cysts, two points were strategically selected, determined by the “coagulant dosage x coagulation pH”, one within the optimal scanning region and the other outside. The studies showed that in the optimal scanning region, the removal of turbidity from the decant walter was greater than 80% and that the recovery of Cryptosporidium and Giardia (oo) cysts in the sludge was greater than 70% and 40%, respectively. These results indicated that the removal of turbidity influenced the removal of these protozoa and that the construction of the coagulation diagram constitutes an important tool in the study of their removal in water treatment plants.

Article Details

How to Cite
[1]
Pereira, D.S.C.A., Costa, E.R.H. da, de Pinho Keller, R. and Coelho, E.R.C. 2025. Use of the coagulation diagrams as a tool for studing the removal of Cryptosporidium sp.p e Giardia spp. in public water supply . Revista AIDIS de ingeniería y ciencias ambientales: Investigación, desarrollo y práctica. 18, 1 (Apr. 2025), 43–60. DOI:https://doi.org/10.22201/iingen.0718378xe.2025.18.1.87967.

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