AbstractThe use of azo dyes is popular in different
branches of industry. Discharge of colourants to surface water cause harmful environmental effects. The
aim of the present study was evaluation of effective-ness of diazo Evans blue decolourization by two
Pseudomonasstrains and estimation of process
byproducts toxicity. In static conditions, both tested
strains removed more than 85 % of dye after 48 h and
completely decolorized samples after 120 h. Agitation
had negative impact on Evans blue removal (less than
70 % of dye removed after 120 h). Ecotoxicological
effects were different for both studied strains beside
comparable decolourization effectiveness. Increase of
zootoxicity was noticed for strain Sz6 and decrease
from IV to III class was noticed for strain SDz3.
Optimization of process conditions for the most
promising strain SDz3 should be deeply examined