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Abstract(s)
O presente trabalho, desenvolvido no âmbito da disciplina “Dissertação/Estágio”, foi realizado na estação de tratamento de águas residuais (ETAR) de Gaia Litoral e teve como objetivo avaliar o impacto da adição de efluentes de aterro sanitário no tratamento biológico de águas residuais. Numa primeira fase foram realizados testes preliminares para testar o uso de inóculos de biomassa de diferentes origens, nomeadamente da ETAR Gaia Litoral e da ETAR do Areinho. Para isso realizaram-se ensaios com diferentes proporções lixiviado/água residual doméstica (10 a 30%), tendo se verificado que as amostras que apresentam menor incorporação de lixiviado apresentaram valores de carência bioquímica de oxigénio (CBO5) superiores. Na etapa seguinte do estudo realizaram-se testes de biodegradabilidade na mesma gama de trabalho (amostras com 10, 20 e 30% de incorporação de lixiviado), ensaios em branco e de controlo (100% de água residual doméstica) para os quais se determinou a respetiva CBO5. A percentagem de biodegradabilidade nos ensaios de controlo variou entre 69,7 e 71,7%, as amostras de 10% obtiveram valores entre 39,5 e 41,7%, as amostras de 20% obtiveram valores entre 51,5% e 56,1%, e as amostras de 30% apresentaram um valor de biodegradabilidade entre 35,0 e 35,8%. Verificou-se que a percentagem de biodegradabilidade dos ensaios de controlo, que apenas contêm água residual doméstica e água destilada, foi superior às percentagens de biodegradabilidade das amostras que contém lixiviado, o que indica que a adição do lixiviado provocou inibição, possivelmente devido à presença de espécies tóxicas que inibiram o crescimento da biomassa. No entanto, os valores obtidos para as diferentes proporções lixiviado/água residual doméstica sugeriram a viabilidade do seu
tratamento biológico conjunto na gama estudada, 10 a 30%.
The present work, developed within the scope of the discipline “Dissertation/Internship”, was carried out at the wastewater treatment plant (WWTP) of Gaia Litoral and aimed to evaluate the impact of adding landfill effluents on the biological treatment of wastewater. In a first phase, preliminary tests were carried out to test the use of biomass inocula from different sources, namely from the Gaia Litoral WWTP and the Areinho WWTP. To this end, tests were carried out with different proportions of leachate/domestic wastewater (10 to 30%), and it was found that the samples with lower leachate incorporation had higher biochemical oxygen demand (BOD5) values. In the next stage of the study, biodegradability tests were carried out in the same working range (samples with 10, 20 and 30% leachate incorporation), blank and control tests (100% domestic wastewater) for which it was determined the respective BOD5. The percentage of biodegradability in control tests varied between 69.7 and 71.7%, the 10% samples obtained values between 39.5 and 41.7%, the 20% samples obtained values between 51.5% and 56.1%, and the 30% samples showed a biodegradability value between 35.0 and 35.8%. It was found that the percentage of biodegradability of the control tests, which only contained domestic wastewater and distilled water, was higher than the percentages of biodegradability of the samples containing leachate, which indicates that the addition of the leachate caused inhibition, possibly due to the presence of toxic species that inhibited biomass growth. However, the values obtained for the different proportions of leachate/domestic wastewater suggest the feasibility of their joint biological treatment in the range studied, 10 to 30%.
The present work, developed within the scope of the discipline “Dissertation/Internship”, was carried out at the wastewater treatment plant (WWTP) of Gaia Litoral and aimed to evaluate the impact of adding landfill effluents on the biological treatment of wastewater. In a first phase, preliminary tests were carried out to test the use of biomass inocula from different sources, namely from the Gaia Litoral WWTP and the Areinho WWTP. To this end, tests were carried out with different proportions of leachate/domestic wastewater (10 to 30%), and it was found that the samples with lower leachate incorporation had higher biochemical oxygen demand (BOD5) values. In the next stage of the study, biodegradability tests were carried out in the same working range (samples with 10, 20 and 30% leachate incorporation), blank and control tests (100% domestic wastewater) for which it was determined the respective BOD5. The percentage of biodegradability in control tests varied between 69.7 and 71.7%, the 10% samples obtained values between 39.5 and 41.7%, the 20% samples obtained values between 51.5% and 56.1%, and the 30% samples showed a biodegradability value between 35.0 and 35.8%. It was found that the percentage of biodegradability of the control tests, which only contained domestic wastewater and distilled water, was higher than the percentages of biodegradability of the samples containing leachate, which indicates that the addition of the leachate caused inhibition, possibly due to the presence of toxic species that inhibited biomass growth. However, the values obtained for the different proportions of leachate/domestic wastewater suggest the feasibility of their joint biological treatment in the range studied, 10 to 30%.
Description
Keywords
Activated Sludge Biodegradability Biological Activity Landfill Leachate Atividade biológica Biodegradabilidade Lamas ativadas Lixiviado