Remoción de Microcistis aeruginosa por diferentes agentes oxidantes

CRETTAZ-MINAGLIA MC; LOMBARDO T ; ARANDA O; ANDRINOLO D; GIANNUZZI L; JUÁREZ I; SEDAN D; BLANCO G

Buenos Aires

Congreso; 3º Congreso Interamericano de Cambio Climático; 2018

Asociaión Interamericana de Ingeniería Sanitaria

Cyanobacterial blooms in surface waters is a serious health hazard to animals and humans because they release cyanotoxins, which are toxic or carcinogenic. Toxic Microcystin-LR (MC-LR) generated by Microcystis aeruginosa is one of the most abundant and common species frequently found in cyanobacterial blooms in fresh and brackish waters. Is very important to develop cyanobacterial removal methods and prevent them from reaching the water treatment plant. The objective of this work was to study the efects of diferents doses of chlorine, hydrogen peroxide, peracetic acid and percitric acid on the cells viability and chlorophyll-a (chlo-a) in a M. aeruginosa culture during 72 hours exposure. The intial conditions of M. aeruginosa culture were: pH value beetwen 8 to 9 and remained without changes during the experiment; initial chlo-a concentration around 1500-2000 μg.L-1; and cells concentration around 9.105-1.106 cells.mL-1. Chlorine (5 mg.L-1), percitric acid (30 and 50 mg.L-1) and hydrogen peroxide (150 mg.L-1) produced 99, 94, 95 and 84% of non viable cells of M. aeruginosa, respectively. Dose of 7.5 mg.L-1 of peracetic acid produce a 54% of non viable cells. Degradation of 3 logaritmic cycles of chlo-a were reached by doses of 3 and 5 mg.L-1 of chlorine, 50 mg.L-1 of percitric acid and 150 mg.L-1 of hidrogen peroxide and only 2 logaritmic was reached by 7.5 mg.L-1 of peracetic acid. The most efective oxidant doses was 5 mg.L-1 of chlorine.