<?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>S0188-49992018000400621</article-id>
<article-id pub-id-type="doi">10.20937/rica.2018.34.04.06</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[EFFECT OF pH, MINING TAILINGS CONCENTRATION AND CULTURE MEDIUM ON THE PERFORMANCE OF POLYMETALLIC BIOLEACHING AT FLASK LEVEL]]></article-title>
<article-title xml:lang="es"><![CDATA[EFECTO DEL pH, CONCENTRACIÓN DE RESIDUOS SÓLIDOS MINEROS Y MEDIO DE CULTIVO SOBRE EL RENDIMIENTO DE LA BIOLIXIVIACIÓN POLIMETÁLICA A NIVEL MATRAZ]]></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[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 contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Rosales]]></surname>
<given-names><![CDATA[María Dolores Josefina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno-Medina]]></surname>
<given-names><![CDATA[Cuauhtémoc Ulises]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Durango  ]]></institution>
<addr-line><![CDATA[Durango Durango]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>34</volume>
<numero>4</numero>
<fpage>621</fpage>
<lpage>634</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992018000400621&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992018000400621&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992018000400621&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The aim of this research was to evaluate bioleaching of Mn, As, Pb and Zn from mining tailings using two different sets of variable processing conditions. In the first set pH (2.0, 4.0 and 6.0), tailings concentrations (10, 20 y 30 %, w/v [111.11, 250.00 and 428.57 g/L, respectively]), and two types of culture medium (9K [with nitrogen source] and nonN (nitrogen-free medium) were evaluated; in the second set the evaluation focused on continuous supplementation of biogenic H2SO4 oxidized with two types of culture medium (9K and nonN) at different tailings concentrations (10, 20 y 30 %, w/v [111.11, 250.00 and 428.57 g/L, respectively]), with continuous supplementation of the media previously described (9K and nonN) oxidized by the native strains Leptospirillum ferriphilum and Leptospirillum ferrooxidans. In the first set, the highest removal of Mn (93.49 %), As (13.92 %) and Pb (&gt; 99 %) was observed in both media at 10 % of tailings and initial pH of 2.0. In the second experimental set, the highest removal of Mn (99 %), As (&gt; 85 %), Pb (&gt; 99 %) and Zn (67 %) was found with both media at 10 % of tailings and initial pH 6.0. Continuous supplementation of biologically acidified and oxidized culture media enhanced the metals removal from solid waste or tailings. Similar metals removal in media without nitrogen compared to medium with nitrogen was observed in this research.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El presente trabajo evaluó la biolixiviación de Mn, As, Pb y Zn de desechos mineros a pH y concentración de sólidos cercanos al usado en la cianuración. Se realizaron dos experimentos. El primero evaluó pH (2.0, 4.0 y 6.0), concentración de jales (10, 20 y 30 %, p/v [111.11, 250.00 y 428.57 g/L, respectivamente]) y dos tipos de medios de cultivo (9K [con fuente de nitrógeno] y nonN [sin fuente de nitrógeno]). El segundo evaluó la suplementación continua de iones férricos bioxidados en dos tipos de medios de cultivo (9K y nonN) a diferentes concentraciones de jales (10, 20 y 30 %, p/v [111.11, 250.00 y 428.57 g/L, respectivamente]) con la suplementación continua de los medios de cultivo anteriormente descritos (9K y nonN) pero bioxidados con las cepas nativas Leptospirillum ferriphilum y Leptospirillum ferrooxidans. En el primer experimento, las mayores eliminaciones de Mn (93.49 %), As (13.92 %) y Pb (&gt; 99 %) se observaron con ambos medios de cultivo, al 10 % de jales y pH inicial 2.0. En el segundo experimento, las mayores remociones de Mn (99 %), As (&gt; 85 %), Pb (99 %) y Zn (67 %) se observaron en ambos medios de cultivo, al 10 % de jales y pH inicial 6.0. La suplementación continua de medio acidificado y oxidado biológicamente aceleró e incrementó la eliminación de metales del residuo minero sólido o jal. Se observó eliminación de metales en el medio sin nitrógeno.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[biological acidification]]></kwd>
<kwd lng="en"><![CDATA[biological oxidation]]></kwd>
<kwd lng="en"><![CDATA[medium without nitrogen source]]></kwd>
<kwd lng="es"><![CDATA[acidificación biológica]]></kwd>
<kwd lng="es"><![CDATA[oxidación biológica]]></kwd>
<kwd lng="es"><![CDATA[medio sin fuente de nitrógeno]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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