<?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>S0188-49992024000100103</article-id>
<article-id pub-id-type="doi">10.20937/rica.54566</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of hydraulic retention time on sulfide production with sludge from hydrothermal vent sediments and its utilization on the removal of Cu, Zn, and Al]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto del tiempo de retención hidráulico sobre la producción de sulfuro con lodo generado de sedimentos de ventilas hidrotermales y su uso en la remoción de Cu, Zn y Al]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Gutiérrez]]></surname>
<given-names><![CDATA[Emir]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guerrero-Barajas]]></surname>
<given-names><![CDATA[Claudia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Unidad Profesional Interdisciplinaria de Biotecnología ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>40</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992024000100103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992024000100103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992024000100103&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The present work aimed to evaluate the production of sulfide through the application of different hydraulic retention times (HRT) and different sulfate loading rates in an up-flow anaerobic sludge blanket (UASB) reactor utilizing acetate-butyrate as electron donors and the coupling of the reactor to a crystallizer to remove metals. The sulfidogenic sludge for the UASB was generated from hydrothermal vent sediments and this was operated at room temperature (18-22 ºC). The sulfate reduction process was linked to the precipitation of Cu2+, Zn2+ and Al3+ in a crystallizer coupled to the UASB reactor (two-stage system) to avoid the toxicity of the metals to the sludge. The concentration of dissolved sulfide increased with the HRT up to 312.9 mg HS-/L at 3 d of HRT. As the sulfate loading rate was increasing, the maximum sulfide concentration obtained was of 376.8 mg HS-/L at 500 mg SO4 -2/L/d (1500 mg/L), whereas the concentration of Cu2+, Zn2+ and Al3+ was up to 150, 100, and 100 mg/L, respectively. The removal efficiencies of Cu2+, Zn2+, and Al3+ were higher than 98% when they were fed separately. When a mixture of metals was added, the removal efficiency was close to 80%. Recovery of metals was lower than 57% in all cases. The sulfide production was supported with acetate-butyrate, being the former commonly accumulated because of the oxidation of higher organic compounds; in this case, its utilization sustained sulfate reduction. This process could be controlled by parameters such as HRT and sulfate loading rate to improve the performance of the bioreactor in the treatment of the effluents contaminated with metals in a two-stage system.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El objetivo del presente trabajo fue evaluar la producción de sulfuro mediante la aplicación de diferentes tiempos de retención hidráulica (TRH) y diferentes cargas de sulfato en un reactor de lecho de lodos de flujo ascendente (UASB, por su sigla en inglés) y estudiar su posible aplicación en la precipitación de Cu2+, Zn2+ y Al3+ en un cristalizador acoplado al reactor UASB (proceso de dos etapas). La concentración de sulfuro disuelto aumentó hasta 312.9 mg HS-/L al aumentar el TRH a 3 d. Al aumentar la carga de sulfato, la concentración máxima de sulfuro que se obtuvo fue de 376.8 mg HS-/L a una carga de 500 mg SO4 -2/L/d (1500 mg/L), mientras que la concentración de Cu2+, Zn2+ y Al3+ fue de hasta 150, 100 y 100 mg/L, respectivamente. Las eficiencias de remoción de Cu2+, Zn2+ y Al3+ fueron mayores a 98 % cuando se alimentaron de forma separada. Cuando se alimentó una mezcla de estos elementos, las eficiencias de remoción fueron cercanas al 80 %. La recuperación de todos los metales fue de 57 % en los tres casos. La producción de sulfuro puede ser controlada por parámetros como el TRH y la carga de sulfato para mejorar el desempeño del reactor en el tratamiento de efluentes contaminados con metales.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[acetate/butyrate as electron donor]]></kwd>
<kwd lng="en"><![CDATA[marine sediments]]></kwd>
<kwd lng="en"><![CDATA[metals removal]]></kwd>
<kwd lng="en"><![CDATA[sulfate reduction]]></kwd>
<kwd lng="en"><![CDATA[UASB reactors]]></kwd>
<kwd lng="es"><![CDATA[acetato/butirato como donadores de electrones]]></kwd>
<kwd lng="es"><![CDATA[sedimento marino]]></kwd>
<kwd lng="es"><![CDATA[remoción de metales]]></kwd>
<kwd lng="es"><![CDATA[reactores UASB]]></kwd>
</kwd-group>
</article-meta>
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