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Se investigó el proceso de biosorción selectiva de Pb y As por esporas bacterianas. El microorganismo utilizado fue Bacillus spp. SG1 aislado del ambiente marino. Los valores de pH óptimo para la adsorción de estos metales tóxicos se encontraron situarse entre 4 y 7. Las esporas mostraron una alta afinidad por estos metales en soluciones acuosas. Una adsorción muy alta de Pb y As se observó a concentraciones iniciales de 4 mg/L y bajo estas condiciones las isotermas de sorción siguen el patrón clásico de Langmuir con un valor de regresión de 0.89 y 0.88 para Pb y As respectivamente. En términos de una simple aplicabilidad práctica se habilitaron botellas de plástico conteniendo una mezcla de arena y esporas activadas con manganeso, resultando en una remoción efectiva del 99% y 98% de Pb y As del agua en el período de 1 hora. Esta simple aplicación puede ayudar a resolver...

The process of selective biosorption of Pb and As by bacterial spores was investigated. The microorganism used was Bacillus spp. SGI isolated from the marine environment. Optimum pH values for the adsorption of these toxic metals were found to be between 4 and 7. The spores showed a high affinity for these metals in aqueous solutions. A very high adsorption of Pb and As was observed at initial concentrations of 4 mg/L and under these conditions the sorption isotherms follow the classic Lanfmuir pattern with a regression value of 0.89 and 0.88 for Pb and As, respectively. In terms of a simple practical applicability, plastic bottles containing a mixture of sand and spores activated with manganese were enabled, resulting in an effective removal of 99% and 98% of Pb and As from the water in a period of 1 hour. This simple application can help resolve the decontamination of underground drink...

In this study the work of induction of microbial carbonate genesis was carried out in order to obtain an improvement in the consolidation of the materials used in construction such as mortars and paving stones, in order to confer them greater resistance and conservation. As a result of the tests carried out, it was found that the inclusion of a bacterial biomass culture formed by bacteria of the genus Bacillus sp., in the formulation of the mortar and paving stones, helped to increase the resistance to compression with Fc values. 266.3 kg/cm2 higher compared to the control of Fc 261.0 kg/cm2. Also, the state of aggregation of the particles improved remarkably, we observed that in the fragmentation tests the structures showed a geometrically more homogeneous grid, compared with the cobbles of the control test. Regarding the texture and roughness aspects, it was proved that the paving ston...

En este estudio se realizó el trabajo de inducción de la carbonatogénesis microbiana con la finalidad de obtener una mejora en la consolidación de los materiales utilizados en construcción como morteros y adoquines, para conferirles una mayor resistencia y conservación. Como resultado de los ensayos realizados se pudo comprobar que la inclusión, de un cultivo de biomasa bacteriana conformada por bacterias del género Bacillus sp., en la formulación del mortero y adoquines, ayudó a aumentar la resistencia a la compresión con valores de Fc 266.3 kg/cm2 mayor en comparación con el control de Fc 261.0 kg/cm2. Asimismo, el estado de agregación de las partículas mejoró notablemente, observamos que en los ensayos de fragmentación las estructuras mostraban una retícula geométricamente más homogénea, comparada con los adoquines del ensayo control. En cuanto a los aspectos de te...

In this study the work of induction of microbial carbonate genesis was carried out in order to obtain an improvement in the consolidation of the materials used in construction such as mortars and paving stones, in order to confer them greater resistance and conservation. As a result of the tests carried out, it was found that the inclusion of a bacterial biomass culture formed by bacteria of the genus Bacillus sp., in the formulation of the mortar and paving stones, helped to increase the resistance to compression with Fc values. 266.3 kg/cm2 higher compared to the control of Fc 261.0 kg/cm2. Also, the state of aggregation of the particles improved remarkably, we observed that in the fragmentation tests the structures showed a geometrically more homogeneous grid, compared with the cobbles of the control test. Regarding the texture and roughness aspects, it was proved that the paving ston...