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The main purpose of this paper is to evaluate the impact of industry wastewater containing synthetic textile dyes on the structure of activated sludge. The aim of the research is to qualify direct impact of the textile dyes, dosed in one week into the experimental system of wastewater treatment plant, on constitution, structure and function of activated sludge. Activated sludge samples (5 mL) were taken from the aeration tank of experimental waste water treatment plant before, during and after measurement and the ...