Navegando por Autor "Affranchino, G."
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Ítem Acceso Abierto Análisis comparativo de la sedimentabilidad de barros activados mediante distintas técnicas(7° CONGRESO DE CIENCIAS AMBIENTALES -COPIME 2019-, 2019) Valle, L.; González, D.; Avalos, J.; Hanela, S.; Calvo, D.; Affranchino, G.; Rossen, A.La tecnología de tratamiento más empleada para efluentes líquidos industriales es la de barros activados, que usa biomasa aerobia en suspensión para degradar los contaminantes orgánicos. La biomasa debe separarse fácilmente del agua tratada por sedimentaci ón. Si no lo hace, puede deberse a bulking , foaming o turbidez . El bulking o hinchamiento está asociado al exceso de microorganismos filamentosos o a la presencia de secreciones viscosas. Para detectar bulking ,se analiza la sedimentación V30 (volumen sedi mentado en 30min), los SST (sólidos suspendidos totales) y se calcula el indicador IVL (índice volumétrico de lodos). Si IVL > 150 mL/g hay bulking y si IVL > 150 mL/g hay posible bulking . En la práctica industrial, el V30 se realiza usandodistintos recip ientes (probetas, conos, jarras) a veces diluyendo la biomasa y otras no. Esta investigación se enfocó en revisar cuán comparables son los valores de V30 e IVL obtenidos con distintas técnicas. Para ello, se utilizó biomasa de cuatro establecimientos indus triales de diversos rubros, sobre la que también se midió SSV (sólidos suspendidos volátiles) y se observó al microscopio. El V30 se efectuó con dilución en probetas de vidrio y plásticas de 1L y sin diluir en cono Imhoff plástico, jarra plástica de 2L y v aso de precipitado de vidrio. Los IVL calculados variaron desde 50% a +85% frente a la técnica diluida con probetas de vidrio. Se hallaron indicios de correlaciones entre los diluida con probetas de vidrio. Se hallaron indicios de correlaciones entre los métodos. Sin embargo, se encontró que no siempre el IVL > 150 mL/g estaba métodos. Sin embargo, se encontró que no siempre el IVL > 150 mL/g estaba asociaasociado a exceso de filamentos o viscosidad, sino que también podía ser do a exceso de filamentos o viscosidad, sino que también podía ser causado por la existencia de bioflocs abiertos o disgregados. Si bien el causado por la existencia de bioflocs abiertos o disgregados. Si bien el resultado es preliminar, sugiere la necesidad de unificar el método de medición resultado es preliminar, sugiere la necesidad de unificar el método de medición de V30 para detectar la presencia o de V30 para detectar la presencia o no de no de bulking bulking y la necesidad de y la necesidad de complementar con análisis microbiológicos.complementar con análisis microbiológicos.Ítem Acceso Abierto Assessing and Comparing Effluent Toxicity by Using the Nematode Caenorhabditis elegans and the Letucce Seed Lactuca sativa(SETAC Latin America 15th Biennial Meeting, Montevideo., 2023-09) Fischer, C.; Affranchino, G.; Ramirez, M.; Manetti, M.; Calvo, D.; Munarriz, E.; Kronberg, F.; Rossen, A.Industrial activities are responsible for the discharge of liquid effluents containing a large amount of persistent and toxic chemical compounds. Industrial effluents are therefore a major source of threat to the integrity of aquatic ecosystems. Even though there should be treatment plants designed to remove polluting compounds from effluents, they are not always implemented, nor do they work properly, resulting in poor quality treatment that does not comply with current environmental standards. In addition, there are many industries that do not have treatment plants and their discharges are clandestine. In Argentina, environmental regulations only require periodic determinations of physicochemical and bacteriological parameters, resulting in a short-sighted, static and limited analysis of effluent quality and their probable impact on the environment. It has been shown that some industrial effluents, although their quality is sufficient to comply with regulations, induce toxic effects. The aim of this study was to evaluate the toxicity of effluents from multiple industries located in the Matanza-Riachuelo river basin (Buenos Aires province, Argentina) and to compare the biological responses of two standard ecotoxicological tests: the nematode Caenorhabditis elegans and the lettuce seed Lactuca sativa . Twelve different types of effluents representative of the textile, ceramics, petrochemical, food, paper, automotive, mechanical, pharmaceutical and construction industries were analysed. Physicochemical parameters such as pH, electrical conductivity, chemical oxygen demand, turbidity among other ions, organics and metals. The results indicated that toxicity is expressed differently between the biological tests with the nematode being more sensitive than vascular plant seeds. In addition, highly toxic effects were revealed in the petrochemical, ceramic and construction industries, even when 1:50 dilutions were tested, pointing to the need to carefully review the toxic properties of complex effluent mixtures and matrices. Results indicated that toxicity is a parameter that bring important information to be considered by environmental regulation in order to better protect the environment and human health.Ítem Acceso Abierto Encuesta sobre Plantas de Tratamiento de Efluentes Líquidos en Argentina: Aspectos Socio-Culturales(XXXVII Congreso Interamericano Virtual de Ingeniería Sanitaria y Ambiental, 2021-04) Nizza, C. ; Lee, H.; Sabels, M. ; Burlaka, M. ; Calvo, D. ; Affranchino, G. ; Rossen, A.The present work belongs to an interdisciplinary research project carried out collaboratively between the Technological Institute of Buenos Aires and the National Water Institute, regarding the evaluation of the current operative situation of the effluent treatment plants in Argentina. Different aspects of the performance, innovation and technical capacities were revised in a carefully-designed survey. Besides, a sociological section, presented in this work, was included so as to generate evidence about their operational and cultural modalities of the wastewater treatment sector. From the surveys received (65), 41% of the cases are registered in two or more environmental control agencies, and there is a widespread overlap among different agencies responsible for wastewater discharge quality values measurements (58%). Around 57% of the cases carried out significant technological innovations during the last 10 years, and only 15% required specific knowledge from their operators to perform specific tasks. Smaller percentages were obtained regarding capacitation plan to new employees (36%), and the incorporation of specific training and / or updating courses (29%). Considering issues related to environmental protection, the compliance percentages are far from the total, with 40% of the plants reporting an insufficient budget. Given these results, and within the framework of the Sustainable Development Goals of the UN 2030 Agenda, the challenge will be to form a permanent matrix of interrelationships between scientific evidence, professionalism and the role of stakeholders of the industrial sector and the State, in order to promote policies that guarantee a greater efficiency and environmental commitment of the sector.Ítem Acceso Abierto Encuesta sobre plantas de tratamiento de efluentes líquidos en Argentina: aspectos técnicos(XXXVII Congreso Interamericano Virtual de Ingeniería Sanitaria y Ambiental, 2021-04) Affranchino, G. ; Hyo Jee, L.; Sabels, M. ; Nizza, C. ; Burlaka, M.; Calvo, D. ; Rossen, A.Wastewater discharges represent one of the most relevant sources of water pollution. Different operation problems at WWTPs (Wastewater Treatment Plants), can reduce the effectiveness of depuration processes. These problems are preventable with correct monitoring and analysis techniques that operators must implement. We conducted a complete survey to collect information on WWTPs in Argentina. Some of the topics were related to different types of effluent treatment, management strategies, fundamental analysis protocols and recurrent operation troubles. The main difficult referred for activated sludge plants, is the escape of solids caused by clumping and foaming phenomena. For anaerobic treatments, the lack of adequate biomass predominates in addition to low pH situations. For lagoons, the main issues are excess of organic load and sediment clogging. Bad quality treated water, usually responds to high levels of COD and BOD, too much phosphorus and –frequently mentioned– poor organoleptic properties.