<?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>1659-4266</journal-id>
<journal-title><![CDATA[Cuadernos de Investigación UNED]]></journal-title>
<abbrev-journal-title><![CDATA[Cuadernos de Investigación UNED]]></abbrev-journal-title>
<issn>1659-4266</issn>
<publisher>
<publisher-name><![CDATA[Universidad Estatal a Distancia de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-42662024000100114</article-id>
<article-id pub-id-type="doi">10.22458/urj.v16i1.5334</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Índice biológico de lodos como bioindicador en dos sistemas de tratamiento de agua residual hospitalaria en Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Sludge biological index as operational bioindicator of two hospital wastewater treatments in Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Loría Naranjo]]></surname>
<given-names><![CDATA[Margarita]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Beita Sandí]]></surname>
<given-names><![CDATA[Wilson]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Estatal a Distancia Maestría Académica en Manejo de Recursos Naturales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica Centro de Investigación en Contaminación Ambiental ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>16</volume>
<numero>1</numero>
<fpage>114</fpage>
<lpage>133</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-42662024000100114&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-42662024000100114&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-42662024000100114&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción: El monitoreo biológico en los sistemas de tratamiento de aguas residuales por lodos activados ofrece resultados integrales y es una herramienta complementaria en las decisiones de control operacional. Una herramienta para ello es el Índice Biológico de Lodos (IBL), basado en protozoos, pero en Costa Rica hay pocos datos sobre este tema. Objetivo: Evaluar el IBL como herramienta de bioindicación en agua residual hospitalaria. Métodos: De febrero a abril de 2022 tomamos, en un hospital costarricense, un total 36 muestras de un sistema de tratamiento por lodos activados Convencional y de un Biorreactor de Membrana (MBR). Resultados: La eficiencia de remoción del DBO y DQO fue mayor en el MBR, sin embargo, en ambos casos la eficiencia fue alta (mayor al 85%), y esto se relaciona con los altos valores de IBL. La eficiencia de remoción nitrógeno no superó el 50% (MBR). Ningún parámetro ambiental tuvo correlación con los valores de IBL, pero la edad del lodo afectó el valor de IBL. Conclusión: Tanto en el sistema de tratamiento convencional como en el MBR, los valores promedio de IBL demuestran un buen desempeño y una alta calidad de los lodos activados]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction: Biological monitoring in activated sludge wastewater treatment systems provides comprehensive results and serves as a complementary tool in operational control decisions. One such tool is the Sludge Biological Index (SBI), which is based on protozoa. However, there is limited data on this topic in Costa Rica. Objective: To evaluate the SBI as a bioindication tool in hospital wastewater. Methods: From February to April 2022, we collected a total of 36 samples from a Conventional Activated Sludge Treatment system and a Membrane Bioreactor (MBR) at a Costa Rican hospital. Results: The removal efficiency of BOD and COD was higher in the MBR; however, in both cases, the efficiency was high (greater than 85%), and this is related to the high SBI values. Nitrogen removal efficiency did not exceed 50% (MBR). No environmental parameter correlated with SBI values, but sludge age affected the SBI value. Conclusion: In both the conventional treatment system and the MBR, the average SBI values indicate good performance and high-quality activated sludge]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Protozoa]]></kwd>
<kwd lng="en"><![CDATA[metazoa]]></kwd>
<kwd lng="en"><![CDATA[bioindication]]></kwd>
<kwd lng="en"><![CDATA[activated sludge]]></kwd>
<kwd lng="en"><![CDATA[MBR]]></kwd>
<kwd lng="en"><![CDATA[ciliates]]></kwd>
<kwd lng="en"><![CDATA[flagellates]]></kwd>
<kwd lng="en"><![CDATA[SBI]]></kwd>
<kwd lng="es"><![CDATA[protozoos]]></kwd>
<kwd lng="es"><![CDATA[metazoos]]></kwd>
<kwd lng="es"><![CDATA[bioindicación]]></kwd>
<kwd lng="es"><![CDATA[lodos activados]]></kwd>
<kwd lng="es"><![CDATA[MBR]]></kwd>
<kwd lng="es"><![CDATA[ciliados]]></kwd>
<kwd lng="es"><![CDATA[flagelados]]></kwd>
<kwd lng="es"><![CDATA[IBL]]></kwd>
</kwd-group>
</article-meta>
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