<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992023000100130</article-id>
<article-id pub-id-type="doi">10.20937/rica.54597</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Evaluation of manganese bioleaching and silver extraction in mining tailings by native bacteria using a flooded system]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación de la biolixiviación de manganeso y extracción de plata en relaves mineros por bacterias nativas utilizando un sistema inundado]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zazueta-Álvarez]]></surname>
<given-names><![CDATA[David Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-Ortega]]></surname>
<given-names><![CDATA[Perla Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Contreras]]></surname>
<given-names><![CDATA[Juan Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fierros-Romero]]></surname>
<given-names><![CDATA[Grisel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medrano-Roldán]]></surname>
<given-names><![CDATA[Hiram]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes Jáquez]]></surname>
<given-names><![CDATA[Damián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Politécnica de Durango Departamento de Ingeniería en Tecnología Ambiental ]]></institution>
<addr-line><![CDATA[Durango Durango]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Tecnológico Nacional de México-Instituto Tecnológico de Durango Departamento de Ingenierías Química y Bioquímica ]]></institution>
<addr-line><![CDATA[Durango Durango]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,School of the Environment, Florida A&amp;M University  ]]></institution>
<addr-line><![CDATA[Tallahassee FL]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>39</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992023000100130&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992023000100130&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992023000100130&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT During the silver extraction process in mining, the generated residues (called tailings) still contain approximately 100-140 g/ton of silver due to the presence of refractory materials that trap this metal and prevent its solubilization by conventional methods. These residues can be treated by biohydrometallurgical processes allowing, together with the cyanidation process, an increase in the efficiency of silver extraction by eliminating refractory materials such as manganese, which is present as pyrolusite (MnO2, 3.78 %). Pyrolusite can change from manganese (IV) to manganese (II) when solubilized by bioleaching. This research analyzed the effects of bioleaching using native bacteria on the concentration of silver extraction from the removal of manganese in mining tailings. The native bacteria ITDBC2, ITDBC5, and ITDBC6 were identified as Leptospirillum ferriphilum by amplification of the 16S gene corroborated by bioinformatic analysis. The experimentation was carried out using a flooded bioleaching system (9.43 L) to resemble the industrial geometry with the following variables: concentration of ferrous ions (2, 7, and 14 g/L), pH (2, 4, and 6) and agitation time at 100 rpm (2, 4 and 6 min/day). The experimentation lasted 18 days. The removal of manganese and silver extraction was 71.84 and 55.53 %, respectively. The scaled-up of the evaluated bioprocess could reduce energy consumption and process larger amounts of pulp than the reported at the laboratory scale.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Durante el proceso minero de extracción de plata, los residuos generados, llamados jales, aún contienen aproximadamente 100-140 g/ton de plata debido a la presencia de materiales refractarios que la atrapan e impiden su solubilización por métodos convencionales. Estos residuos pueden tratarse mediante procesos biohidrometalúrgicos que, en conjunto con el proceso de cianuración, permiten incrementar la eficiencia de extracción de plata mediante la eliminación de materiales refractarios como el manganeso, el cual se encuentra en forma de pirolusita (MnO2, 3.78 %). La pirolusita puede pasar de manganeso (IV) a manganeso (II) al solubilizarse mediante biolixiviación. Esta investigación analizó los efectos de la biolixiviación con bacterias nativas sobre la concentración de extracción de plata a partir de la remoción de manganeso en jales mineros. Las bacterias nativas (ITDBC2, ITDBC5 e ITDBC6) fueron identificadas como Leptospirillum ferriphilum por amplificación del gen 16S y corroboradas por análisis bioinformático. La experimentación se realizó mediante un sistema de biolixiviación inundado (9.43 L) para simular la geometría industrial con las siguientes variables: concentración de iones ferrosos: 2, 7 y 14 g/L; pH: 2, 4 y 6, y tiempo de agitación a 100 rpm: 2, 4 y 6 min/día. La experimentación duró 18 días. Las respuestas para la remoción de manganeso y extracción de plata fueron 71.84 y 55.53 %, respectivamente. Implementado a escala, el bioproceso evaluado podría disminuir el consumo energético y procesar mayores cantidades de pulpa respecto de los resultados obtenidos en laboratorio.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Leptospirillum ferriphilum]]></kwd>
<kwd lng="en"><![CDATA[pirolusite removal]]></kwd>
<kwd lng="en"><![CDATA[microaerophilic bioprocess]]></kwd>
<kwd lng="es"><![CDATA[Leptospirillum ferriphilum]]></kwd>
<kwd lng="es"><![CDATA[remoción de pirolusita]]></kwd>
<kwd lng="es"><![CDATA[bioproceso microaerofílico]]></kwd>
</kwd-group>
</article-meta>
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