Abstract
Toxicity bioassay with aquatic organisms are an effective tool to assess, predict or simply detect pollution effects on living organisms. Although diverse systems of sewage treatment systems exist, the majority of them presents have functioning problems and they do not fulfill with its purpose of treatment and correct disposal of these residues. UASB reactors (Upflow Anaerobic Sludge Blanket) have been used to treat effluents and leachate deriving from other treatment systems. The aim of this research was evaluate the efficiency of an experimental UASB reactor in the leachate treatment, utilizing acute toxicity tests with Daphnia magna. Sixteen effluent samples were collected during six months, before and after the reactor’s treatment. The effluent toxicity evaluation allowed the detection of changes caused by the own treatment system operation. Results showed that the effluent treatment in this kind of reactor could reduce toxicity up to 80%, although low values of EC50 for carried tests showed high toxicity in all samples. The toxicity tests used in the present work are based on the whole effluent and can show a way to evaluate an effluent when there is no detailed information that the same contain. Efforts should address the increase of reactor’s efficiency, improving the quality of treated effluents in this system.
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