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19 results on '"Vasquez, Yaneth"'

4. Safety Management Model with a Behavior-Based Safety Coaching Approach to Reduce Substandard Behaviors in the Mining Sector

Author

Gómez, Brahayan, Sánchez, Roberto, Vásquez, Yaneth, Mamani-Macedo, Nestor, Raymundo-Ibañez, Carlos, Dominguez, Francisco, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Ahram, Tareq, editor, Taiar, Redha, editor, Gremeaux-Bader, Vincent, editor, and Aminian, Kamiar, editor

Published
2020
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13. Reactores Bioquímicos Pasivos: Una alternativa biotecnológica para la remediación de drenajes ácidos de mina

Author

Vasquez, Yaneth, Escobar, Maria Camila, Vasquez, Yaneth, and Escobar, Maria Camila

Abstract

Acid Mine Drainage (AMD) is currently the main pollutant in mining areas. Passive biochemical reactors are a sustainable technology easy to install using agro-industry waste from the mining region and operating in remote locations. Besides, bioreactors are clean technology that involves bioprocesses, chemical reactions and metal precipitation, minimizing the impact of AMD on soils and fresh water sources. The passive biochemical reactors are columns packed with a "reactive mixture" consisting of organic, inorganic materials and a microbial inoculum. In this reactive mixture, AMD is remediated through physicochemical processes such as metals adsorption, precipitation and co-precipitation, as well as, the reduction of sulfate to sulfur, while pH and alkalinity are increased. In order to provide recent information and research needs in the subject, this document presents a review of the literature about the chemical and biological generation of AMD and its remediation using passive biochemical reactors. The knowledge of the basic concepts of these processes is extremely useful to evaluate the possible applications, benefits and limitations of these treatment systems used by biotechnology during the bioremediation of mining effluents., El Drenaje ácido de mina (DAM) es actualmente el principal contaminante de las regiones mineras. Los reactores bioquímicos pasivos son una tecnología sostenible fácil de instalar que utiliza desechos agroindustriales de la región y puede operar en áreas remotas con poco mantenimiento. Además, son una tecnología limpia que involucra bioprocesos, reacciones químicas y precipitación de metales minimizando el impacto de los vertimientos ácidos sobre suelos y cuerpos de aguas. Los reactores bioquímicos pasivos son columnas empacadas con una “mezcla reactiva” conformada por materiales orgánicos, inorgánicos y un inoculo microbiano. En esta mezcla se remedia el DAM por medio de procesos fisicoquímicos como la adsorción, precipitación, coprecipitación de los metales y de la reducción del sulfato a sulfuro, mientras se incrementa el pH y la alcalinidad. Con el fin de brindar información reciente, así como las necesidades de investigación en el tema este documento presenta una revisión de literatura sobre la generación química y biológica de los DAM, así como su remedición utilizando reactores bioquímicos pasivos. El conocimiento de los conceptos básicos de estos procesos es extremadamente útil para evaluar las posibles aplicaciones, beneficios y limitaciones de estos sistemas de tratamiento utilizados por la biotecnología durante la biorremediación de efluentes mineros.

Published
2020

17. Effect of hydraulic retention time on microbial community in biochemical passive reactors during treatment of acid mine drainage.

Author

Vasquez, Yaneth, Escobar, Maria C., Saenz, Johan S., Quiceno-Vallejo, Maria F., Neculita, Carmen M., Arbeli, Ziv, and Roldan, Fabio

Subjects
*ACID mine drainage, *BIOREACTORS testing, *ANAEROBIC reactors, *ACIDOPHILIC bacteria, *PHYLOGENETIC models
Abstract

The effect of hydraulic retention time (HRT) on the microbial community during acid mine drainage (AMD) treatment was investigated. Physicochemical and molecular (illumina and qPCR) analyses were performed on reactive mixtures collected from seven bioreactors in three-operation period (8, 17 and 36 weeks). Long HRT (4 day) favored the relative abundance of SRB, causing the increase of residual sulfides and short HRT (1 day) affected the anaerobic conditions of the bioreactors and favored the presence the acidophilic chemolithotrophic microorganisms. Besides qPCR indicated that genes related to cellulose degradation were present in low copy numbers and were affected by the HRT. Finally, environmental factors (pH, organic source, metal sulfides, and sulfate concentrations) had significant impact on relative abundance of the phylogenetic lineages, rather than the types of lineages present in the reactive mixture. The findings of this study indicate that HRT affects the stability of passive bioreactors and their microbial communities. [ABSTRACT FROM AUTHOR]

Published
2017
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