<?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>S0188-49992025000100101</article-id>
<article-id pub-id-type="doi">10.20937/rica.55026</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Eficiencia de rizobacterias de Scirpus californicus y Typha dominguensis en la reducción de DQO de aguas residuales bajo condiciones de laboratorio]]></article-title>
<article-title xml:lang="en"><![CDATA[Efficiency of rhizobacteria of Scirpus californicus and Typha dominguensis in the reduction of wastewater COD under laboratory conditions]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Masias-Flores]]></surname>
<given-names><![CDATA[Sandra Maite]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Granada-Cruz]]></surname>
<given-names><![CDATA[Gabriela Olenka]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vera-Marmanillo]]></surname>
<given-names><![CDATA[Verónika Isela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Andina del Cusco Facultad de Ingeniería y Arquitectura ]]></institution>
<addr-line><![CDATA[Cusco ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de San Antonio Abad del Cusco Facultad de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[Cusco ]]></addr-line>
<country>Peru</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>41</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992025000100101&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992025000100101&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992025000100101&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Las aguas residuales constituyen uno de los principales problemas ambientales en Cusco, Perú, alterando considerablemente la calidad de los recursos hídricos, especialmente debido a la presencia de materia orgánica como principal contaminante. El tratamiento insuficiente de estos efluentes, debido a la incapacidad de las empresas prestadoras de servicios de saneamiento para alcanzar a toda la población, subraya la necesidad de adoptar tecnologías limpias y eficientes que empleen bioagentes, conocidos por su capacidad altamente efectiva para degradar contaminantes. Este estudio se enfoca en evaluar la reducción de la demanda química de oxígeno (DQO) mediante la acción de rizobacterias provenientes de Scirpus californicus y Typha dominguensis en aguas residuales urbanas. Dichas bacterias fueron extraídas de la rizósfera de ambas especies de totora, procedentes del humedal Lucre-Huacarpay y se cultivaron por separado en agua residual proveniente de la Planta de Tratamiento de Aguas Residuales (PTAR) San Jerónimo - Cusco, obtenida después del proceso de cribado. El estudio evaluó tres variables: la dosis (1 % v/v y 2 % v/v), el tiempo de incubación (3 y 5 días) y la temperatura (20 ºC y 30 ºC). Los resultados revelaron una reducción de la DQO entre el 15 % y el 51 % con las rizobacterias de Typha dominguensis, y entre el 18 % y el 49.58 % con las de Scirpus californicus. Los valores más significativos de reducción de la DQO se observaron con una dosis del 1 % (v/v), durante cinco días de incubación a 20 ºC. En conclusión, las rizobacterias aisladas demostraron una remoción considerable de la DQO y se recomienda su integración en un sistema de tratamiento de aguas residuales como componente clave.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Wastewater constitutes one of the main environmental problems in Cusco, Peru, considerably altering the quality of water resources, primarily due to organic matter being the primary contaminant. Due to the inability of companies providing sanitation services to reach the entire population, the insufficient treatment of these effluents highlights the need to adopt clean and efficient technologies that use bioagents, known for their highly effective capacity to degrade pollutants. This study evaluates the reduction of chemical oxygen demand (COD) through the action of rhizobacteria from Scirpus californicus and Typha dominguensis in urban wastewater. These bacteria were extracted from the rhizosphere of both reed species from the Lucre-Huacarpay wetland and were grown separately in wastewater from the San Jerónimo - Cusco Wastewater Treatment Plant (WWTP), obtained after the screening. The study evaluated three variables: dose (1% v/v and 2% v/v), incubation time (3 and 5 days) and temperature (20 ºC and 30 ºC). The results revealed a COD reduction between 15% and 51% with Typha dominguensis rhizobacteria and 18% and 49.58% with Scirpus californicus. The most significant COD reduction values were observed with a dose of 1% (v/v) during five days of incubation at 20 ºC. In conclusion, the isolated rhizobacteria demonstrated considerable COD removal, and their integration into a wastewater treatment system is recommended as a key component.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[materia orgánica]]></kwd>
<kwd lng="es"><![CDATA[efluentes urbanos]]></kwd>
<kwd lng="es"><![CDATA[biorremediación]]></kwd>
<kwd lng="es"><![CDATA[rizósfera de macrófitas]]></kwd>
<kwd lng="en"><![CDATA[Organic matter]]></kwd>
<kwd lng="en"><![CDATA[urban effluents]]></kwd>
<kwd lng="en"><![CDATA[bioremediation]]></kwd>
<kwd lng="en"><![CDATA[macrophyte rhizosphere]]></kwd>
</kwd-group>
</article-meta>
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