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IMPACT OF TEXTILE INDUSTRY WASTEWATER ON MICROORGANISMS OF ACTIVATED SLUDGE
Abstract
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 degradation of flocks was monitored twice a day in two weeks using optical microscope (Leica DMRE). During dosing of synthetic textile dyes into the experimental wastewater treatment plant, significant changes in structure and constitution of activated sludge was observed, especially rapid degradation of sludge that led to complete disintegration of sludge flocks. The change in microbial composition of activated sludge was also observed. The Protozoa (Rotaria sp., Vorticella sp., Opercularia sp., etc.), that commonly occur in activated sludge was found immobilized or dead. In the second part of this experiment, dosing of dyes also led to significant overgrowth of undesirable filamentous microorganisms, especially bacteria of genus Nocardia, Thiotrix or Beggiatoa. Results of this experiment lead to the conclusion that wastewater from textile industry containing synthetic textile dyes residue affects the structure and function of activated sludge, which is the basis of biological waste water treatment.
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References13
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