<?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>0120-6230</journal-id>
<journal-title><![CDATA[Revista Facultad de Ingeniería Universidad de Antioquia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.fac.ing.univ. Antioquia]]></abbrev-journal-title>
<issn>0120-6230</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería, Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-62302016000300063</article-id>
<article-id pub-id-type="doi">10.17533/udea.redin.n80a08</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Nitrogen and cod removal from tannery wastewater using biological and physicochemical treatments]]></article-title>
<article-title xml:lang="es"><![CDATA[Remoción de dqo y nitrógeno de aguas residuales de una tenería usando tratamiento biológico y fisicoquímico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pire-Sierra]]></surname>
<given-names><![CDATA[María Carolina]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cegarra-Badell]]></surname>
<given-names><![CDATA[Diana Dielui]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrasquero-Ferrer]]></surname>
<given-names><![CDATA[Sedolfo José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Angulo-Cubillan]]></surname>
<given-names><![CDATA[Nancy Elena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Montiel]]></surname>
<given-names><![CDATA[Altamira Rosa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Centroccidental Lisandro Alvarado Departamento de Ecología y Control de Calidad ]]></institution>
<addr-line><![CDATA[Barquisimeto ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Zulia Facultad de Ingeniería ]]></institution>
<addr-line><![CDATA[Maracaibo ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad del Zulia Facultad de Ingeniería ]]></institution>
<addr-line><![CDATA[Maracaibo ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2016</year>
</pub-date>
<numero>80</numero>
<fpage>63</fpage>
<lpage>73</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-62302016000300063&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-62302016000300063&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-62302016000300063&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT An integrated wastewater treatment was evaluated for nitrogen and COD removal from a tannery effluent. The system was conformed by the combination of a biological treatment using a sequencing batch reactor (SBR) followed by a physicochemical treatment based in a coagulation-flocculation process. The contaminants in the tannery wastewater had average concentrations of 1546 mg COD·L&#8722;1, 200 mg TKN·L&#8722;1 and 121 mg N-NH4 +·L&#8722;1. The duration of a complete SBR operation cycle was 12 h. Dissolved oxygen (DO), pH and oxidation-reduction potential (ORP) were used to monitor biological nutrient removal process in the reactor. In addition, densities of nitrifying and denitrifying microorganisms in the mixed liquor were evaluated during the biological treatment. During physicochemical treatment, the concentrations of FeCl3.6H2O and sour brine (agroindustrial waste used as adjuvant) were 2.7 and 100 g·L-1, respectively (doses were 60 and 5 mL·L-1, respectively). Results show the integrated treatment system was effective to produce an effluent suitable for discharge into water bodies, according to the Venezuelan environmental regulations. Average effluent concentrations were 303 mg COD L&#8722;1, 35.1 mg TN·L&#8722;1 and 0.5 mg N-NH4 +·L-1, giving COD, TN and N-NH4 + removals of 80%, 82% and 99.6%, respectively. Profiles of ORP, DO and pH were efficient ways to monitor the evolution of biological nutrient removal and real-time control can be implemented in order to optimize the SBR operation. Finally, density of nitrifying bacteria was greater than density of denitrifying bacteria during biological treatment.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se evaluó la remoción de DQO y nitrógeno de aguas residuales de una tenería usando un sistema integrado de tratamiento. El sistema estuvo conformado por la combinación de un tratamiento biológico usando un reactor por carga secuencial (SBR) seguido de un tratamiento fisicoquímico basado en un proceso de coagulación-floculación. Las concentraciones promedio de los contaminantes en el agua residual fueron 1546 mg·L-1 de DQO, 200 mg·L-1 de NTK y 121 mg·L-1 de N-NH4 +. La duración del ciclo en el SBR fue de 12 h. La concentración de oxígeno disuelto (OD), pH y potencial de óxido-reducción (POR) se usaron para monitorear el proceso de remoción biológica de nutrientes en el reactor. Adicionalmente, se determinó la densidad de microorganismos nitrificantes y desnitrificantes en el licor mezcla. Para el tratamiento fisicoquímico se emplearon concentraciones de 2,7 y 100 g·L-1 para el FeCl3.6H2O y amargos de salmuera (desecho agroindusrial usado como coadyuvante), las dosis fueron de 60 y 5 mL·L-1, respectivamente. Se obtuvo que el sistema integrado de tratamiento fue efectivo para producir un efluente apto para ser descargado a cuerpos de agua, según la normativa ambiental venezolana. Las concentraciones del efluente al final del tratamiento integrado fueron 303 mg·L-1 de DQO, 35,1 mg·L-1 de NT y 0,5 mg·L-1 de N-NH4 +, representando remociones de 80%, 82% y 99,6%, respectivamente. Los perfiles de POR, OD y pH resultaron ser una forma eficiente de evaluar la evolución de la remoción biológica de nutrientes, por tanto, el control en tiempo real puede ser implementado para optimizar el funcionamiento del SBR. Finalmente, la densidad de los microorganismos nitrificantes resultó ser mayor que la de los desnitrificantes durante el tratamiento biológico.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Tannery wastewater]]></kwd>
<kwd lng="en"><![CDATA[biological treatment]]></kwd>
<kwd lng="en"><![CDATA[physicochemical treatment]]></kwd>
<kwd lng="en"><![CDATA[nutrient removal]]></kwd>
<kwd lng="en"><![CDATA[online monitoring]]></kwd>
<kwd lng="en"><![CDATA[bacterial density]]></kwd>
<kwd lng="es"><![CDATA[Agua residual tenería]]></kwd>
<kwd lng="es"><![CDATA[tratamiento biológico]]></kwd>
<kwd lng="es"><![CDATA[tratamiento fisicoquímico]]></kwd>
<kwd lng="es"><![CDATA[nutrientes]]></kwd>
<kwd lng="es"><![CDATA[monitoreo en línea]]></kwd>
<kwd lng="es"><![CDATA[densidad bacteriana]]></kwd>
</kwd-group>
</article-meta>
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