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Towards sustainable drinking water treatment - the use of natural coagulant in the removal of microalgae

IWRA World Water Congress 2017 - Cancun Mexico
1. Water, sanitation and health
Author(s): Livia Oliveira Ruiz Moreti
Daniel Mantovani
Marcelo F Vieira
Angélica M S Vieira
Laiza B Beltran
Giovana Telles
Fatima J Basset
Livia Oliveira Ruiz Moreti
State University Maringa
li.moreti@hotmail.com
Daniel Mantovani
State University Maringa
daniel26mantovani@gmail.com
Marcelo F Vieira
State University Maringa
marcelofvieira@hotmail.com
Angélica M S Vieira
State University Maringa
angelicamsalcedo@hotmail.com
Laiza B Beltran
Federal University Tecnologica de Campo Mourao
laizabeltran@hotmail.com
Giovana Telles
State University Maringa
giovanatelles7@hotmail.com
Fatima J Bassetti
Federal University Tecnologica Curitiba
fjbassetti@gmail.com
Raquel G Gomes
State University Maringa
raquelgutierres@hotmail.com
Alvaro Alberto Araujo
Federal University Sergipe
aliberto9@yahoo.fr
Rosangela Bergamasco
State University Maringa
ro.bergamasco@hotmail.com


Keyword(s): drinking water, natural coagulant, removal of microalgae
Poster:

Abstract

The presence of microalgae in drinking water supply can cause significant disturbances. The process water clarification (coagulation/flocculation/dissolved air flotation, C/F/DAF) are used due to good efficiency for removal this contaminant. As a future strategy, the application of natural coagulants to water treatment emerges as a promising ecologically and socially sustainable option. Thus, the aim of this work is the application of the C/F/FAD process with Moringa oleifera seeds to removal Microcystis aeruginosa from water. For the tests it was used a synthetic water by deionized water with M. aeruginosa inoculum in cultive medium ASM-1. C/F/DAF tests it was used the "flotest" equipment. It was verified the efficiency of two types of coagulants based on M. oleifera seeds: full powder and defatted powder with ethanol. The results shown that M. oleifera defatted seeds were better to removal chlorophyll-a (91%), color (72%), turbidity (77%) and UV254nm (45%) from water than M. oleifera full powder seeds that shown removal from cholophyll-a, color, turbidity and UV254nm about 82%, 60%, 64%, 28%, respectively. It was observed that residual values of dissolved organic carbon (DOC) were increased in the water treated for the both coagulants based M. oleifera, being the defatted seeds shown lightly larger (14,5 mg.L-1) than the full seeds (12,4 mg.L-1).

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