Avaliação da detoxificação de associações de lodos de ETE e ETA pelo bioensaio de Allium cepa

• Autor(a) principal: Santos, Tamara [UNESP]
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/157048; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-08-30/000907049.pdf
• topic: Resíduos; Resíduos sólidos; Biorremediação; Toxicologia genética; Lodo de esgoto; Cebola; Água - Estações de tratamento; Água - Qualidade; Agricultura; Cromossomos - Aberrações; Residuos organicos como fertilizantes

Water Treatment Plants (WTP) and Sewage Treatment Plants (STP) use methodologies to ensure the quality of water for the population and to reduce the impacts of xenobionts on water bodies. However, the treatment processes generate waste, called treatment sludge. They can be discarded without treatment in water bodies or, if treated, sent to landfills, generating a high cost for the stations. Sewage sludge (SS) has beneficial characteristics to be reused in agriculture as fertilizers or as soil reconditioners successively used in crops due to its large amounts of organic matter. However, the use of this waste without adequated pretreatment can have negative impacts on the environment, as it may contain harmful substances, such as metals and potentially toxic organic compounds. Sludge from Water Treatment Plants (SW) has been used in some countries in the area of civil construction and citrus crops, but in Brazil few studies have considered the benefits of using SW in agriculture. Bioremediation is a process used in waste treatment, which uses microorganisms capable of decomposing pollutants. The aim of this study was to evaluate the efficacy of the bioremediation process for a period of 6 months in the detoxification of WTP and STP sludge, through Allium cepa test. The phytotoxic, cytotoxic, genotoxic and mutagenic potentials of pure sludge samples (SW and SS), of association between SW and SS and combinations of both sludges with soil, before and after the bioremediation process, were evaluated in this study. At the initial time of the experiment (T0), the treatments performed with SW; SW+S; SW+SS samples inhibited the germination of A. cepa seeds. However, the radicles of the few seeds that germinated did not reach enough length for the accomplishment of the ecotoxicogenetic tests. Regarding the results of cytotoxicity and mutagenicity for T0, the treatments were not significant when compared with the results of the negative control (NC) test...