This study evaluated the toxicity of effluent generated in a furniture industry spray booth, before and after treatment in a system composed of an anaerobic sequencing batch (ASBR) followed by an aerobic sequencing batch reactor (SBR). The toxicity tests were carried out with raw (with and without dilutions) and treated effluent to evaluate the toxic potential using Allium cepa and Lactuca sativa as bioindicators. The toxicity tests, using Allium cepa and Lactuca sativa, indicated that the anaerobic-aerobic treatment performed was efficient to reduce the toxicity of the paint booth effluent. The raw effluent, undiluted and diluted (at 1:10; 1:8 and 1:6 dilutions), showed toxic effect on the root growth of Allium cepa, as it inhibited root growth by 100%. In the tests with Lactuca sativa seeds, there was partial inhibition, between 44% and 63%, for 1:10 and 1:8 dilutions, but for the 1: 6 dilution and without dilution of effluent the inhibition was 100%. The treated effluent, in an ASBR followed by an SBR, presented a small percentage of inhibition for tests with Allium cepa (13%) and Lactuca sativa seeds (4%). The effluent treated by the anaerobic system followed by aerobic presented low toxicity without generating lethal or sub-lethal effects to the test organisms, which indicates the efficiency of the treatment process.
Para melhor controle de sistemas de tratamento de águas residuárias são desenvolvidos vários softwares com a finalidade de modelar estes sistemas. Este trabalho visou a avaliação do comportamento de uma estação de tratamento de águas residuárias localizada no norte do estado do Paraná. Este sistema de tratamento é composto por um tanque de equalização, um flotador, um reator de lodos ativados e um decantador e foi analisado por meio da aplicação de dois parâmetros do efluente: a Demanda Bioquímica de Oxigênio (DBO) e a Demanda Química de Oxigênio (DQO) no software WRc STOAT utilizando os modelos matemáticos ASAL1 e IAWQ#1, respectivamente. Depois das devidas configurações, os valores obtidos foram de 2,45mg/L para DBO sendo o valor real fornecido pela empresa foi de <3mg/L, e 3,84mg/L para DQO, com valor real fornecido pela empresa de <5mg/L. Por meio deste estudo, foi possível aplicar os modelos matemáticos no software de forma satisfatória, sem erros no processo e, assim como no sistema real, confirmando o atendimento a legislação CONAMA 430/2011 e CEMA 70/2009. Além disso, verificou-se a possibilidade de variar diversos parâmetros de entrada no software a fim de observar o comportamento dos sistemas de tratamento de águas residuárias.
(CIP) G393 Gestão da Produção em Foco-Volume 33/ SUMÁRIO Capítulo 17: Projeto do trabalho em um torno CNC: Da análise à sugestão de adequações das condições de saúde e segurança ..
The leachatefrom landfillhas high concentrations of organic matter, humic and nitrogenous compounds, heavy metals and inorganic salts, which requiresproper treatment for its final destinationand does not cause damage to the environment. Studies show that the biologically treated effluent requires an association of physical-chemical techniques.Thisstudy aimed to evaluate the application of complementary techniques to thebiological treatmentsuch as coagulation-flocculation-sedimentation(CFS)andFenton's reaction oxidation(FR), followed by adsorption. The CFS with ferric chloride and FRpost-treatments isolated had100% and 87,9%, organic mattercorrelated with true color removal and 53,6% and 67,0% of CODremoval,which meetwiththe requirements of CONAMA 357/05 e 430/11 for disposal in water bodies. The adsorption after Fenton reaction resulted in 84,5% organic matter correlated with true color removal and 67,0% of CODremoval. Adsorption after coagulation-flocculation-sedimentation was able to reduce 76,9% of COD. CFSshowed higher removal efficiency of organic matter correlated to the true color, while RFobtained higher removal efficiency of NKT, N-ammoniacal and COD parameters. The biologically treated leachate did not show significant toxicityacute to the test organism saline artemia, however, after the post-treatment, acute ecotoxicity in the limits established by CEMA 81/10.
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