Author: ROBERTO BRIONES GALLARDO

Mecanismos que liberan arsénico al agua subterránea de la Comarca Lagunera, estados de Coahuila y Durango, México

MIGUEL MEJIA Roberto Briones Gallardo Antonio Cardona Benavides (2014)

A fin de dilucidar los procesos que dan origen a las altas concentraciones de arsénico en el acuífero de la Comarca Lagunera (México), se llevaron a cabo estudios geoquímicos del agua subterránea y los sedimentos. Los resultados de la geoquímica de los sedimentos indica que el arsénico disponible se encuentra principalmente adsorbido en los óxidos de Fe amorfos y cristalinos. Los resultados de la geoquímica del agua subterránea indican: 1) intercambio catiónico entre el calcio y el sodio; 2) disolución de calcita debido al intercambio catiónico; 3) aumento del pH debido a la disolución de la calcita, y 4) altas concentraciones de arsénico debido a elevados valores de pH.

A fin de dilucidar los procesos que dan origen a las altas concentraciones de arsénico en el acuífero de la Comarca Lagunera (México), se llevaron a cabo estudios geoquímicos del agua subterránea y los sedimentos. Los resultados de la geoquímica de los sedimentos indican que el arsénico disponible se encuentra principalmente adsorbido en los óxidos de Fe amorfos y cristalinos. Los resultados de la geoquímica del agua subterránea indican: 1) intercambio catiónico entre el calcio y el sodio; 2) disolución de calcita debido al intercambio catiónico; 3) aumento del pH debido a la disolución de la calcita, y 4) altas concentraciones de arsénico debido a elevados valores de pH.

Article

Aguas subterráneas Sedimentos Arsénico Óxidos de fierro pH Comarca Lagunera INGENIERÍA Y TECNOLOGÍA

Role of indigenous microbiota from heavily contaminated sediments in the bioprecipitation of arsenic Autor

ERIKA ELIZABETH RIOS VALENCIANA ROBERTO BRIONES GALLARDO Luis Felipe Cházaro Ruiz NADIA VALENTINA MARTINEZ VILLEGAS María de Lourdes Berenice Celis García (2017)

"High arsenic concentrations have been detected in alluvial aquifers of arid and semi-arid zones in Mexico. This work describes the potential of microbial arsenate reduction of the indigenous community present in sediments from an arsenic contaminated aquifer. Microcosms assays were conducted to evaluate arsenate and sulfate-reducing activities of the native microbiota. Two different sediments were used as inoculum in the assays amended with lactate (10 mM) as electron donor and with sulfate and arsenate (10 mM each) as electron acceptors. Sediments were distinguished by their concentration of total arsenic 238.3 ± 4.1 mg/kg or 2263.1 ± 167.7 mg/kg, which may be considered as highly contaminated sediments with arsenic. Microbial communities present in both sediments were able to carry out arsenate reduction, accomplished within 4 days, with the corresponding formation of arsenite; sulfate reduction took place as well. Both reducing activities occurred without previous acclimation period or enrichment, even at potential inhibitory concentrations of arsenate as high as 750 mg/L (10 mM). The formation of a yellowish colloidal precipitate was evident when both reducing processes occurred in the microcosm, which contributed to remove between 52 and 90.9% of As(III) from the liquid phase by bioprecipitation of arsenic as arsenic sulfide."

Article

Arsenate Bioprecipitation Sediment Sulfate Reduction INGENIERÍA Y TECNOLOGÍA INGENIERÍA Y TECNOLOGÍA

Gold recovery from very dilute solutions from a mine in closing process: adsorption-desorption onto carbon materials

ESMERALDA VENCES ALVAREZ ELIAS RAZO FLORES Isabel Lázaro ROBERTO BRIONES GALLARDO GUILLERMO VELASCO MARTINEZ JOSE RENE RANGEL MENDEZ (2017)

"The aurocyanide complex recovery by precipitation with zinc decreases when gold concentration drops to < 20 μg L− 1. Therefore, a technology capable of recovering gold from very diluted solution is necessary. Adsorption and desorption experiments were carried out with real solutions in batch and in continuous processes to determine the gold adsorption capacity and rate onto two activated carbons (AC). The results showed that AC F400 and CSC removed 86 and 81 μg g− 1, respectively, at pH 11 and Ce of 10 μg L− 1 in about 4 h. Whereas desorption test by NaOH and CN− showed a gold recovery of up to 86%. These experiments were correlated to the textural and chemical properties of adsorbents and to the chemical composition of samples from a heap leach process. AC is a highly efficient and selective adsorbent for gold cyanide solutions when gold is present in very low concentration (< 12 μg L− 1)."

Article

Gold cyanide Activate carbons Adsorption Desorption Packed bed column BIOLOGÍA Y QUÍMICA QUÍMICA QUÍMICA FÍSICA

An overview of reclaimed wastewater reuse in gold heap leaching

Rodolfo Palomo Briones MONSERRAT OVANDO FRANCO Elías Razo Flores María de Lourdes Berenice Celis García JOSE RENE RANGEL MENDEZ ESMERALDA VENCES ALVAREZ ROEL CRUZ GAONA Isabel Lazaro ROBERTO BRIONES GALLARDO (2016)

"The intensive use of groundwater by the gold mining industry is an important sustainability concern, especially in arid and semiarid regions where groundwater is a scarce resource. Alternatives, such as water reuse, treatment and recycling, have been implemented to overcome this issue. The potential use of reclaimed wastewater in gold heap leaching, without decreasing the process efficiency, has not yet been considered. Hence, this review focuses on the physicochemical, biological, and chemical features (organic matter, microbial loads, metal ions, and anions) of reclaimed wastewater that may limit its use in gold heap leaching."

Article

Cyanide biodegradation Gold Heap leaching Reclaimed wastewater Sustainable mining INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA METALÚRGICA TECNOLOGÍA METALÚRGICA