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- Title
Remoção de partículas similares aos oocistos de Cryptosporidium por filtração direta ascendente usando um coagulante natural: estudo em escala piloto.
- Authors
Romero Méndez, Ingrith Marcela; Pérez Ginoris, Yovanka; Silveira Brandão, Cristina Celia; Ferreira Nascimento, Marcely
- Abstract
In the present study were performed up-flow in-line filtration experiments, in pilot scale, to evaluate the performance of the natural coagulant chitosan on the removal of polystyrene microspheres with similar dimensions to the Cryptosporidium oocysts in the natural water treatment with turbidity around 30 uT, with kaolinite-induced. The parameters evaluated were the turbidity, organic matter (absorbance 254 nm) and microspheres concentration. Initially, were performed jar tests for the coagulation diagram construction and definition of the conditions to be adopted in the filtration experiments. The up-flow in-line filtration experiments were effectuated in the optimal coagulation conditions, over-optimal and sub-optimal dosages. The coagulation diagram showed a region of optimal performance of chitosan, corresponding to effluent turbidity values from 0.5 uT to 0.25 uT at doses between 0.9 e 1.5 mg/L and pH values between 5 and 6. In the filtration experiments conducted in optimal coagulation conditions the mean effluent turbidity was 0.29 uT during the regular operation of the system. In this coagulation condition the microspheres removal ranged between 4.3 log e 4.9 log. The over optimal and suboptimal coagulation conditions, affected the filter performance with increases in the effluent turbidity and was accompanied by removal reduction of microspheres with respect to the optimal coagulation condition of the order of 0.65 to 0.98 log, respectively, during the regular operation of the system, indicating that these coagulation conditions lead to increases the number of particles with similar dimensions to the Cryptosporidium oocysts in the filter effluent, which can compromise the microbiological quality of the water produced. Finally, in all investigated coagulation conditions the mean absorbance (UV254 nm) removal was 50%.
- Publication
Revista de Investigación Agraria y Ambiental, 2016, Vol 7, Issue 2, p15
- ISSN
2145-6097
- Publication type
Article
- DOI
10.22490/21456453.1554