<?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>S0188-49992019000400905</article-id>
<article-id pub-id-type="doi">10.20937/rica.2019.35.04.10</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[TRATAMIENTO DE UN AGUA RESIDUAL INDUSTRIAL A TEMPERATURA PSICROFÍLICA CON UN REACTOR UASB]]></article-title>
<article-title xml:lang="en"><![CDATA[TREATMENT OF INDUSTRIAL RESIDUAL WATER AT PSYCHROPHILIC TEMPERATURE WITH A UASB REACTOR]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jacobo López]]></surname>
<given-names><![CDATA[Adriana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esparza Soto]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez]]></surname>
<given-names><![CDATA[Mercedes Lucero]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fall]]></surname>
<given-names><![CDATA[Cheikh]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del Estado de México Facultad de Ingeniería ]]></institution>
<addr-line><![CDATA[Toluca Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma del Estado de México Instituto Interamericano de Tecnología y Ciencias del Agua ]]></institution>
<addr-line><![CDATA[Toluca Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>35</volume>
<numero>4</numero>
<fpage>905</fpage>
<lpage>915</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992019000400905&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992019000400905&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992019000400905&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En el presente trabajo se operó un reactor anaerobio de flujo ascendente (UASB, por sus siglas en inglés) a escala de laboratorio con un tiempo de retención hidráulico (6 h) y a temperatura psicrofílica (&lt; 20 ºC). En el reactor UASB se trató agua residual de una industria chocolatera con dos cargas orgánicas volumétricas aplicadas (COVapl). Cada COVapl correspondió a una etapa experimental: la etapa experimental I con 1.8 ± 0.8 kg de demanda química de oxígeno soluble ([DQOs]/m3/d) y la etapa experimental II con 3.5 ± 0.9 kg DQOs/m3/d. El objetivo fue evaluar la eficiencia de remoción de la DQOs (ER), la producción de biogás (PB) y el rendimiento celular experimental (Y  exp ) en un reactor UASB a escala de laboratorio. Los parámetros de control monitoreados fueron pH, temperatura y flujo. La alcalinidad, ácidos grasos volátiles y DQOs se analizaron en el influente y efluente, mientras que los sólidos suspendidos se analizaron dentro del reactor y en el efluente. Durante el estado estacionario de las dos etapas experimentales la ER fue mayor al 90 %. La elevada ER obtenida mostró que en el reactor UASB se trató eficientemente el agua residual industrial a baja temperatura con las COVapl. La PB se incrementó cuando la COVapl aumentó (1.6 ± 0.8 y 3.5 ± 1.3 L/d con la COVapl de 1.8 y 3.5 kg DQOs/m3/d, respetivamente [1 atm, 273º K]). El Y  exp de la etapa experimental II fue alto (0.11 kg SSV/kg DQOrem), lo cual pudo deberse a que la temperatura psicrofílica influyó sobre la tasa de crecimiento de los microorganismos anaerobios.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT In the present work, a laboratory scale anaerobic upflow reactor (UASB) was operated with a hydraulic retention time (6 h) and at psychrophilic temperature (&lt; 20 ºC). The UASB reactor treated wastewater from a chocolate industry with two applied organic volumetric loads (OLRapl). Each OLRapl corresponded to an experimental stage: experimental stage I with 1.8 ± 0.8 kg soluble oxygen chemical demand ([DQOs]/m3/d) and experimental stage II with 3.5 ± 0.9 kg CODs/m3/d. The objective of this research was to evaluate the removal efficiency of CODs (RE), biogas production (BP) and experimental cell yield (Y  exp ) within the laboratory scale UASB reactor. The control parameters monitored were pH, temperature and flow. Alkalinity, volatile fatty acids and CODs were analyzed in the influent and effluent, while suspended solids were analyzed inside the reactor and in the effluent. The RE during the steady state of the two experimental stages was greater than 90 %. The high RE obtained showed that the UASB reactor efficiently treated the industrial wastewater at low temperature with the OLRapl. BP increased when OLRapl increased (1.6 ± 0.8 and 3.5 ± 1.3 L/d of OLRapl of 1.8 and 3.5 kg CODs/m3/d, respectively [1 atm, 273 K]). The Y  exp of experimental stage II was high (0.11 kg SSV/kg CODrem). The high Y  exp of experimental stage II could be due to the influence of psychrophilic temperature in the growth rate of anaerobic microorganisms.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[baja temperatura]]></kwd>
<kwd lng="es"><![CDATA[carga orgánica volumétrica]]></kwd>
<kwd lng="es"><![CDATA[biogás]]></kwd>
<kwd lng="es"><![CDATA[rendimiento celular]]></kwd>
<kwd lng="en"><![CDATA[low temperature]]></kwd>
<kwd lng="en"><![CDATA[organic volumetric load]]></kwd>
<kwd lng="en"><![CDATA[biogas and cell yield]]></kwd>
</kwd-group>
</article-meta>
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