<?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>0120-5609</journal-id>
<journal-title><![CDATA[Ingeniería e Investigación]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. Investig.]]></abbrev-journal-title>
<issn>0120-5609</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería, Universidad Nacional de Colombia.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-56092023000200011</article-id>
<article-id pub-id-type="doi">10.15446/ing.investig.94617</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Influence of Conventional and Hybrid Septic Tank-Anaerobic Filter Configurations on the Hydrodynamics and Performance of Wastewater Treatment]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación de la influencia de las configuraciones convencional e híbrida de tanque séptico-filtro anaerobio sobre la hidrodinámica y desempeño del tratamiento de aguas residuales]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arias-Henao]]></surname>
<given-names><![CDATA[Maricel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paredes-Cuervo]]></surname>
<given-names><![CDATA[Diego]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Lozada]]></surname>
<given-names><![CDATA[Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Tecnológica de Pereira Faculty of Engineering ]]></institution>
<addr-line><![CDATA[Pereira ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Tecnológica de Pereira Faculty of Environmental Sciences ]]></institution>
<addr-line><![CDATA[Pereira ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad del Valle Faculty of Engineering ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2023</year>
</pub-date>
<volume>43</volume>
<numero>2</numero>
<fpage>1</fpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-56092023000200011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-56092023000200011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-56092023000200011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Decentralized treatment is an adequate strategy to more sustainably treat municipal wastewater in rural and peri-urban areas. In light of the above, this study evaluated, on a pilot scale, the performance of an anaerobic configuration consisting of a septic tank (ST) and an anaerobic filter (AF) in two modalities: (i) a conventional system (CS) in separate reactors and (ii) a hybrid system (HS) with a ST and an AF in a single reactor -both with theoretical hydraulic retention times (HRTs) of 36, 30, 24, and 18 hours. The results indicated that the HS had a better performance (less variability) under the different conditions evaluated, achieving, at an HRT of 18 hours, higher reduction efficiencies (52,0±16,8% COD and 73,06±18,5% TSS) compared to the CS (39,8±13,1% COD and 65,8±20,52% TSS). Although hydrodynamic analysis showed dual flow (full mix and plug flow) in both configurations, the HS exhibited a greater predominance of plug flow (62%) than the CS (52%), which allowed the former to reach a real HRT closer to the theoretical value than the latter (23/24 vs. 19/24 hours). This behavior guarantees the lowest occurrence of dead zones and short circuits, as well as a higher Persson hydraulic efficiency (0,62) and lower area requirements for the HS in comparison with the CS (0,5).]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El tratamiento descentralizado es una estrategia adecuada para tratar las aguas residuales municipales en áreas rurales y periurbanas de manera más sostenible. Con base en esto, este estudio evaluó, a escala piloto, el desempeño de una configuración anaerobia conformada por un tanque séptico (TS) y un filtro anaerobio (FA) en dos modalidades: (i) un sistema convencional (SC) en reactores separados y (ii) un sistema híbrido (SH) con TS y FA en un solo reactor -ambos con tiempos teóricos de retención hidráulica (TRH) de 36, 30, 24 y 18 horas. Los resultados indicaron que el SH presentó un mejor desempeño (menor variabilidad) bajo las diferentes condiciones evaluadas, logrando, a un TRH de 18 horas, mayores eficiencias de reducción (52,0±16,8 % DQO y 73,06±18,5 % SST) en comparación con el SC (39,8±13,1 % DQO y 65,8±20,52 % SST). Aunque el análisis hidrodinámico mostró flujo dual (mezcla completa y flujo pistón) en ambas configuraciones, el SH presentó mayor predominio del flujo pistón (62 %) que el SC (52 %), lo que permitió que el primero alcanzara un TRH real más cercano al valor teórico que el segundo (23/24 vs. 19/24 horas). Este comportamiento garantiza la menor ocurrencia de zonas muertas y cortocircuitos, así como una mayor eficiencia hidráulica de Persson (0,62) y menores requerimientos de área para el SH en comparación con el SC (0,5).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[anaerobic digestion]]></kwd>
<kwd lng="en"><![CDATA[anaerobic filter]]></kwd>
<kwd lng="en"><![CDATA[decentralized wastewater treatment]]></kwd>
<kwd lng="en"><![CDATA[hydrodynamic performance]]></kwd>
<kwd lng="en"><![CDATA[septic tank]]></kwd>
<kwd lng="es"><![CDATA[digestión anaerobia]]></kwd>
<kwd lng="es"><![CDATA[filtro anaerobio]]></kwd>
<kwd lng="es"><![CDATA[tratamiento descentralizado de aguas residuales]]></kwd>
<kwd lng="es"><![CDATA[comportamiento hidrodinámico]]></kwd>
<kwd lng="es"><![CDATA[tanque séptico]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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