Variación temporal y espacial de la calidad de las aguas superficiales en la subcuenca del río Virilla (Costa Rica) entre 2006 y 2010

Herrera, Jorge; Rodríguez, S.; Rojas, J. F.; Herrera, Éricka; Chaves, Maria Manuela

doi:10.15359/rca.45-1.5

Cited by 6 publications

(7 citation statements)

References 8 publications

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“…In the wet season, DO concentration was higher as the river was highly diluted, and the dilution effect decreases the concentration of organic matter while runoff increases nitrate and turbidity. Similar results were reported by Brenes and Mora [45] in the Tárcoles and Reventazón rivers, and by Herrera et al [46] in the Virilla basin in Costa Rica. In the dry season, low river flow and an increase in industrial wastewater discharges-particularly from coffee processing plants near sample point 2-could influence higher concentrations of TS and BOD.…”

Section: Resultssupporting

confidence: 91%

Spatial and Seasonal Surface Water Quality Assessment in a Tropical Urban Catchment: Burío River, Costa Rica

Mena-Rivera

Salgado-Silva

Benavides-Benavides

et al. 2017

Water

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Water quality assessments are essential for providing information regarding integrated water resource management processes. This study presents the results of a spatial and seasonal surface water quality assessment of the Burío river sub-catchment in Costa Rica. Fourteen sample campaigns were conducted at eight sample sites between 2005 and 2010. Seasonal variations were evaluated using linear mixed-effects models where dissolved oxygen, total solids, and nitrate showed significant differences between dry and wet seasons (p < 0.05). Cluster analysis identified three clusters at the top, middle, and bottom of the catchment that were consistent with land use patterns, and principal component analysis identified the main parameters that were affecting 84% of the total variance in water quality (biochemical oxygen demand, dissolved oxygen, total phosphate, and nitrate). The National Sanitation Foundation Water Quality Index (NSF-WQI) results indicated the majority of the river consisted of mainly "medium" water quality, although "bad" and "good" water quality results were identified depending on sample site and season. This methodological approach provides a useful monitoring technique for local governments that can be used for further remediation strategies.

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Section: Resultssupporting

confidence: 91%

Spatial and Seasonal Surface Water Quality Assessment in a Tropical Urban Catchment: Burío River, Costa Rica

Mena-Rivera

Salgado-Silva

Benavides-Benavides

et al. 2017

Water

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“…BOD average concentration was 10.15 mg/L O 2 . This is consistent with the results reported by Herrera et al [48]. However, BOD ranged from <2 mg/L O 2 in sample site V1 to a maximum of 206.8 mg/L O 2 in site V4.…”

Section: Discussionsupporting

confidence: 93%

“…However, alkalinity concentration increased downstream with values up to 264 mg/L CaCO 3 . These levels were previously associated to vertisol soils presented in the catchment [48], which can also increase conductivity. Average DO concentration was 81.8%, but some critical values were obtained.…”

Section: Discussionmentioning

confidence: 52%

Ecosystemic Assessment of Surface Water Quality in the Virilla River: Towards Sanitation Processes in Costa Rica

Mena-Rivera

Vásquez-Bolaños

Gómez-Castro³

et al. 2018

Water

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Water quality information is essential supporting decision making in water management processes. The lack of information restricts, at some point, the implementation of adequate sanitation, which is still scarce in developing countries. In this study, an ecosystemic water quality assessment was conducted in the Virilla river in Costa Rica, in a section of particular interest for future sanitation development. It included the monitoring of physical, chemical, microbiological and benthic macroinvertebrate parameters from 2014 to 2016. Mutivariate statistics and water quality indexes were used for data interpretation. Results indicated that water quality decreased downstream towards more urbanised areas. Particularly, extreme values of phosphorous, nitrogen and E. coli were found. Sample sites were grouped in two clusters, which were consistent with land use. Benthic macroinverterbrates diversity was predominantly represented by Baetidae, Chironomidae, Leptohyphidae, Hydropsychidae, Simuliidae and Physidae. They were mostly influenced by water temperature, nitrite, ammonium, soluble reactive phosphorous, total solids, alkalinity, nitrate and total suspended solids. Three water quality indexes consistently showed the poor condition of the water body. The overall results indicate that the main sources of pollution in the river are likely to be wastewater discharges. Thus, special efforts should be undertaken regarding its regulation in the country.

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“…Dicha acción controla los niveles de contaminación o toxicidad para reducir el impacto en el cuerpo receptor y cumplir con la legislación (Reynolds, 2002). En la elección de un método o sistema apto, se valoran las características fisicoquímicas de las aguas, el pretratamiento requerido para la corriente y finalmente la viabilidad económica y técnica (Reynolds, 2002) Costa Rica sufrió por varios años las consecuencias de un rezago en temas de infraestructura y tecnologías en el tratamiento de aguas residuales y en el control del cumplimiento de la legislación vigente para reducir la contaminación de los cuerpos de agua (Herrera, et al, 2013). A pesar del aumento histórico en la cobertura de saneamiento, este sigue siendo limitado.…”

Section: Introductionunclassified

Aporte ambiental de la planta de tratamiento de aguas residuales Los Tajos en la remoción de contaminantes fisicoquímicos y microbiológicos

et al. 2022

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El objetivo del estudio fue analizar el aporte ambiental hacia la calidad del río Torres considerando la remoción de contaminantes fisicoquímicos y microbiológicos de la planta de tratamiento de aguas residuales (PTAR) Los Tajos. Se realizó el análisis de datos fisicoquímicos y microbiológicos de las aguas de afluente y efluente de la PTAR (DBO, DQO, SST, STT, N-NH4+, P-PO43-, GyA, SAAM y coliformes fecales principalmente) y se analizó la variación en concentración de contaminantes en el río Torres previo y posterior a la construcción de la PTAR, que realiza un tratamiento primario a las aguas, todo asociado a la estacionalidad. Los datos se analizaron en R versión 3.6.1. Según la metodología del índice holandés, el río Torres se clasificó severamente contaminado previo a la construcción de la PTAR, y actualmente aumenta su grado de contaminación después de la descarga de la PTAR, principalmente en época lluviosa. La PTAR presenta remoción significativa para siete de los ocho parámetros analizados, los porcentajes de remoción más representativos son: SST (68.5 %), DBO (49.8 %) y GyA (54.7 %). Se demostró el aporte cuantitativo de la PTAR al río Torres removiendo toneladas de contaminantes de las aguas residuales desde el 2015 hasta el 2020, principalmente DQO (26,791.8 Mg), SST (24,162.6 Mg), DBO (12,290.0 Mg) y STT (30,267.7 Mg). Finalmente se dejó en evidencia la necesidad de construir las siguientes etapas de la PTAR que incluyen tratamiento secundario, que mejoraría la remoción de materia orgánica, surfactantes y nutrientes.

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Variación temporal y espacial de la calidad de las aguas superficiales en la subcuenca del río Virilla (Costa Rica) entre 2006 y 2010

Abstract: Variación temporal y espacial de la calidad de las aguas superficiales en la subcuenca del río Virilla (Costa Rica) entre 2006 y 2010Temporal and spatial variation in quality of surface water in the watershed Virilla ( Costa Rica )

Cited by 6 publications

References 8 publications

Spatial and Seasonal Surface Water Quality Assessment in a Tropical Urban Catchment: Burío River, Costa Rica

Spatial and Seasonal Surface Water Quality Assessment in a Tropical Urban Catchment: Burío River, Costa Rica

Ecosystemic Assessment of Surface Water Quality in the Virilla River: Towards Sanitation Processes in Costa Rica

Aporte ambiental de la planta de tratamiento de aguas residuales Los Tajos en la remoción de contaminantes fisicoquímicos y microbiológicos

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