<?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>1390-6542</journal-id>
<journal-title><![CDATA[Enfoque UTE]]></journal-title>
<abbrev-journal-title><![CDATA[Enfoque UTE]]></abbrev-journal-title>
<issn>1390-6542</issn>
<publisher>
<publisher-name><![CDATA[Universidad UTE]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1390-65422025000300037</article-id>
<article-id pub-id-type="doi">10.29019/enfoqueute.1144</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Use of carbon activated impregnated with Fe to enhance methane production of wastewater from nixtamalization process]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Burboa Charis]]></surname>
<given-names><![CDATA[Vianey A]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Escalante Torres]]></surname>
<given-names><![CDATA[Margarita S]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Armenta Gutiérrez]]></surname>
<given-names><![CDATA[Miguel A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tenorio Diaz]]></surname>
<given-names><![CDATA[Lourdes M]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leyva Soto]]></surname>
<given-names><![CDATA[Luis A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meza]]></surname>
<given-names><![CDATA[Angel R]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez Valencia]]></surname>
<given-names><![CDATA[Luis H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Dpto. Biotecnología y Ciencias Alimentarias, Instituto Tecnológico de Sonora, Ciudad Obregon, Sonora  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Dpto. Ciencias del Agua y Medio Ambiente, Instituto Tecnológico de Sonora, Ciudad Obregon, Sonora  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Dpto. Biotecnología y Ciencias Alimentarias, Instituto Tecnológico de Sonora, Ciudad Obregon, Sonora  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Dpto. Biotecnología y Ciencias Alimentarias, Instituto Tecnológico de Sonora, Ciudad Obregon, Sonora  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Dpto. Biotecnología y Ciencias Alimentarias, Instituto Tecnológico de Sonora, Ciudad Obregon, Sonora  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Dpto. Biotecnología y Ciencias Alimentarias, Instituto Tecnológico de Sonora, Ciudad Obregon, Sonora  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,Dpto. Biotecnología y Ciencias Alimentarias, Instituto Tecnológico de Sonora, Ciudad Obregon, Sonora  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2025</year>
</pub-date>
<volume>16</volume>
<numero>3</numero>
<fpage>37</fpage>
<lpage>43</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_arttext&amp;pid=S1390-65422025000300037&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_abstract&amp;pid=S1390-65422025000300037&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.senescyt.gob.ec/scielo.php?script=sci_pdf&amp;pid=S1390-65422025000300037&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Wastewater from the nixtamalization process represents a challenge due to its complex and highly alkaline composition. The present work aims to enhance methane production by anaerobic digestion of nejayote with conductive materials based on carbon modified with iron. Through two experimental phases, the most significant results show that the metal load in granular activated carbon (GAC) does not stimulate electron transfer in a medium such as nejayote. On the other hand, when the pH is kept at neutral values, an 88 % reduction in COD and high values &#8203;&#8203;of accumulated methane are obtained. The study describes the relationship between using GAC and nejayote as a methane promoter in anaerobic digestion, which can be a sustainable alternative.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Las aguas residuales provenientes del proceso de nixtamalización representan un reto por su composición compleja y altamente alcalina. El presente trabajo tiene como objetivo potenciar la producción de metano mediante la digestión anaeróbica de nejayote con materiales conductores a base de carbón modificado con hierro. A través de dos fases experimentales, los resultados más significativos muestran que la carga metálica en el carbón activado granular (CAG) no estimula la transferencia de electrones en un medio como el nejayote. Por otro lado, cuando el pH se mantiene en valores neutros, se obtiene una reducción del 88 % en la DQO y altos valores de metano acumulado. El estudio describe la relación entre el uso del CAG y el nejayote como promotor de metano en la digestión anaeróbica, lo que puede ser una alternativa sustentable.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Anaerobic digestion]]></kwd>
<kwd lng="en"><![CDATA[wastewater]]></kwd>
<kwd lng="en"><![CDATA[nejayote]]></kwd>
<kwd lng="en"><![CDATA[methane production]]></kwd>
<kwd lng="en"><![CDATA[conductive materials]]></kwd>
<kwd lng="en"><![CDATA[direct interspecies electron transfer (DIET)]]></kwd>
<kwd lng="es"><![CDATA[Digestión anaerobia]]></kwd>
<kwd lng="es"><![CDATA[agua residual]]></kwd>
<kwd lng="es"><![CDATA[nejayote]]></kwd>
<kwd lng="es"><![CDATA[producción de metano,]]></kwd>
<kwd lng="es"><![CDATA[materiales conductores]]></kwd>
<kwd lng="es"><![CDATA[transferencia directa de electrones entre especies (DIET)]]></kwd>
</kwd-group>
</article-meta>
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