<?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>2007-0934</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias agrícolas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Cienc. Agríc]]></abbrev-journal-title>
<issn>2007-0934</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-09342022000100029</article-id>
<article-id pub-id-type="doi">10.29312/remexca.v13i1.3096</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Reducción de ácido sulfhídrico mediante recirculación de efluentes en lagunas de estabilización con microalgas]]></article-title>
<article-title xml:lang="en"><![CDATA[Reduction of hydrogen sulfide by recirculation of effluents in stabilization ponds with the presence of microalgae]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Hernández]]></surname>
<given-names><![CDATA[Isaías]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega-Morales]]></surname>
<given-names><![CDATA[Natalia Belén]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-Diaz]]></surname>
<given-names><![CDATA[Sergio Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Flores-Hernandez]]></surname>
<given-names><![CDATA[Eduardo Aron]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-García]]></surname>
<given-names><![CDATA[Laura Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medrano-Santillana]]></surname>
<given-names><![CDATA[Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Agraria Antonio Narro Unidad Región Laguna ]]></institution>
<addr-line><![CDATA[Torreón Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico de Torreón  ]]></institution>
<addr-line><![CDATA[Torreón Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2022</year>
</pub-date>
<volume>13</volume>
<numero>1</numero>
<fpage>29</fpage>
<lpage>40</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-09342022000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-09342022000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-09342022000100029&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las lagunas de estabilización (LE) se utilizan como una alternativa para el tratamiento de aguas residuales; sin embargo, una de sus desventajas es la emisión de malos olores ocasionados por el ácido sulfhídrico (H2S), el cual es altamente tóxico y corrosivo, además de que provoca daños a la salud de la población aledaña y afecta negativamente a las estructuras metálicas y equipos eléctricos expuestos. Esta problemática es una prioridad para resolver y continuar con la operación de las plantas de tratamiento de agua residual. En este estudio se presenta como alternativa de solución un procedimiento basado en la recirculación del efluente de 20%, el cual contiene microalgas nativas. Para determinar el porcentaje óptimo de recirculación del efluente, se implementó una serie de pruebas de recirculación a través del método de jarras y posteriormente fue llevado a escala macro, evaluando el desempeño de la recirculación del efluente comparando los promedios mensuales del año 2019 antes de la implementación del proyecto con 2020 ya operando. Los resultados mostraron cambios significativos en los porcentajes de remoción de contaminantes, en la demanda bioquímica de oxígeno, de 20.8%, solidos suspendidos totales, 22.17%, grasas y aceites, 29.5% y una reducción en los coliformes fecales, 91.4%, además de reducción del H2S con un 48.9%, lo que disminuye los olores desagradables y potencial efecto toxico a la salud. Podemos concluir que la metodología es eficiente en la mejora de los parámetros antes mencionados, cumpliendo así los estándares de las normativas aplicables.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Stabilization ponds (SPs) are used as an alternative for wastewater treatment; however, one of their disadvantages is the emission of bad odors caused by hydrogen sulfide (H2S), which is highly toxic and corrosive, in addition to causing damage to the health of the surrounding population and negatively affecting the metallic structures and electrical equipment exposed. This problem is a priority to be solved in order to continue with the operation of wastewater treatment plants. In this study, a procedure based on the recirculation of 20% of the effluent, which contains native microalgae, is presented as a solution alternative. To determine the optimal percentage of effluent recirculation, a series of recirculation tests were implemented through the jar method and subsequently it was taken to a macro scale, evaluating the performance of the effluent recirculation, comparing the monthly averages of 2019 before the implementation of the project with 2020 already operating. The results showed significant changes in the percentages of pollutant removal, in the biochemical oxygen demand, of 20.8%, total suspended solids, 22.17%, fats and oils, 29.5% and a reduction in fecal coliforms, 91.4%, in addition to reducing H2S with 48.9%, which reduces unpleasant odors and the potential toxic effect on health. We can conclude that the methodology is efficient in improving the parameters, thus complying with the standards of the applicable regulations.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[recirculación del efluente]]></kwd>
<kwd lng="es"><![CDATA[tratamiento de aguas residuales]]></kwd>
<kwd lng="en"><![CDATA[effluent recirculation]]></kwd>
<kwd lng="en"><![CDATA[wastewater treatment.]]></kwd>
</kwd-group>
</article-meta>
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