Dispersion and treatment performance analysis of an UASB reactor under different hydraulic loading rates

Peña, Miguel; Mara, D. D.; Avella, G.P.

doi:10.1016/j.watres.2005.11.021

Cited by 72 publications

(42 citation statements)

References 7 publications

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“…La producción de biogás varió desde 0,165 a 0,456 m 3 biogás/kgDQO, con un promedio de 0,280 m 3 biogás/kgDQO, resultado similar a los obtenidos a escala real (Peña et al, 2006) de 0,341 a 0,434 m 3 biogás/kgDQO removida. El porcentaje de metano varió entre 49,4% y 88,92% con un promedio de 72,32%; estos resultados son similares a los encontrados a escala de laboratorio (Bermúdez et al, 2003).…”

Section: Resultados Y Discusiónunclassified

“…Dentro de estos sistemas se encuentran los RAFA conocido como UASB por sus siglas en inglés (Upflow Anaerobic Sludge Blanket) que es un reactor multifase (líquido-sólido-gas) y por consiguiente, el comportamiento global de la dispersión es el resultado de interacciones físicas interdependientes, propiedades del flujo, segregación de partículas y advección (Peña et al, 2006). El comportamiento hidrodinámico de reactores de flujo continuo puede evaluarse siguiendo el método experimental estímulo-respuesta, inyectando un trazador inerte de concentración conocida en el afluente (Rocha et al, 2000).…”

Section: Introductionunclassified

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Modelo de Dispersión Axial para Sistemas de Flujo Continuo Ajustado a las Condiciones de Borde

2016

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ResumenSe desarrolló un modelo matemático a partir de la ecuación general de dispersión y se comparó con tres modelos tradicionales. Para obtener los datos experimentales se realizaron ensayos hidráulicos utilizando litio como trazador agregado de forma puntual en el influente de un Reactor Anaerobio de Flujo Ascendente de 518 litros, alimentado con agua residual de la ciudad de Maracaibo-Venezuela a tiempos de retención hidráulico teórico de 10, 8, 5 y 4 horas. Se tomó muestras en el efluente y al final del lecho y manto de lodo. Los mejores ajustes se lograron con el modelo propuesto con desviación media absoluta entre 5 y 33% y desviación media relativa entre -1,7 y -18%. En todos los casos, el número de dispersión fue mayor a 0.01 indicando que no existió flujo pistón en el reactor. Palabras clave: dispersión axial; modelo; trazador; inyección puntual; reactor de flujo ascendente Axial Dispersion Model for Continuous Flow Systems Adjusted Boundary Conditions AbstractIn this study a mathematical model was developed from a general dispersion equation, which was compared with three traditional models. Tracer tests were carried injected lithium as a pulse at the reactor influent. Several samples were collected in an Upflow Anaerobic Sludge Bed reactor o 518 liters to obtain the experimental data. The reactor was feeding from municipal wastewater of Maracaibo city, Venezuela. Several theoretical retention times were evaluated between 4, 5, 8 and 10 hours. Samples were taken at the final effluent and at the end of the sludge blanket and bed level. Best fits were obtained with the proposed model giving absolute mean deviation between 5.0 and 33% and relative mean deviation between -1.7 and -18%. In most of the studies the dispersion number was lower than 0.01 concluding that plug flow did not exist in the reactor.

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Section: Resultados Y Discusiónunclassified

Section: Introductionunclassified

Modelo de Dispersión Axial para Sistemas de Flujo Continuo Ajustado a las Condiciones de Borde

2016

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“…Therefore, large reactor will result in decreased biogas production and sludge washout due to insufficient mixing within the reactor. In contrast, comparatively more height may promote substrate mixing leading to proper contact of substrate with microorganisms resulting in more organic matter degradation and formation of biogas [81].…”

Section: Effect Of Hydraulic Retention Time (Hrt)mentioning

confidence: 99%

Review of Upflow Anaerobic Sludge Blanket Reactor Technology: Effect of Different Parameters and Developments for Domestic Wastewater Treatment

Daud

Rizvi

Akram

et al. 2018

Journal of Chemistry

110

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The upflow anaerobic sludge blanket (UASB) reactor has been recognized as an important wastewater treatment technology among anaerobic treatment methods. The objective of this study was to perform literature review on the treatment of domestic sewage using the UASB reactor as the core component and identifying future areas of research. The merits of anaerobic and aerobic bioreactors are highlighted and other sewage treatment technologies are compared with UASB on the basis of performance, resource recovery potential, and cost. The comparison supports UASB as a suitable option on the basis of performance, green energy generation, minimal space requirement, and low capital, operation, and maintenance costs. The main process parameters such as temperature, hydraulic retention time (HRT), organic loading rate (OLR), pH, granulation, and mixing and their effects on the performance of UASB reactor and hydrogen production are presented for achieving optimal results. Feasible posttreatment steps are also identified for effective discharge and/or reuse of treated water.

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“…This selection was made because it is a highly water-soluble salt, shows good diffusibility and can be detected in low concentrations; it is rare in nature and widely used for this purpose. Some authors have used the lithium chloride tracer in response to stimulus tests for determining the distribution curves of hydraulic residence time of bioreactors in wastewater treatment (Peña;Mara;Vella, 2006;Lourenço;Campos, 2009;Sarathai;Koottatep;Morel, 2010;Rincón;Galindo;Pérez, 2011;Zheng et al, 2012).…”

Section: Hydrodynamic Testsmentioning

confidence: 99%

Hydrodynamic behavior of a combined anaerobic-aerobic system employed in the treatment of vinasse

Fia

Campos

et al. 2016

Ciênc. agrotec.

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The understanding of reactor hydrodynamics is essential for improving the performance of a reactor and biogas production. This study sought to evaluate the hydrodynamic behavior of a combined anaerobic-aerobic system at a laboratory scale for treating vinasse. The experiment was conducted in a system using two UASB reactors connected in series, followed by an Aerated Submerged Biological Filter (ASBF). The flow rates applied to the system and the corresponded theoretical HRTs in the UASB1, UASB2 and ASBF were respectively: 15.6 L d . The hydrodynamic studies were carried out using pulse type stimulus-response tests, employing LiCl as a tracer. The coefficients of determination for the dispersion models (R 2 ) indicate a close approximation of a continuous stirred tank reactor in series (multi-CSTR) model, with an average of 2.5, 2.3 and 1.2 (first year), and 1.1, 1.4 and 0.9 (second year) multi-CSTR for UASB1, UASB2 and ASBF, respectively. Results of the hydrodynamic tests carried out in UASB1, UASB2 and ASBF indicated strong tendency for flow in the complete mixture hydraulic regime, detecting a wide dispersion in the units, in addition to the presence of short circuits and dead zones.Index terms: Hydrodynamic study; tracers; biological treatment. RESUMOO entendimento sobre a hidrodinâmica dos reatores é essencial para melhorar o desempenho e produção de biogás destas unidades. O objetivo deste estudo foi avaliar o comportamento hidrodinâmico de um sistema combinado anaeróbio-aeróbio em escala laboratorial no tratamento da vinhaça. O experimento foi conduzido em um sistema utilizando dois reatores UASB em série seguidos por um biofiltro biológico aerado submerso (FBAS). As vazões aplicadas no sistema e os correspondentes TRHs teóricos nos reatores UASB1, UASB2 e FBAS foram respectivamente: 15,6 L d . Os perfis hidrodinâmicos foram realizados por meio de testes tipo pulso estímulo-resposta empregando como traçador LiCl. Os coeficientes de determinação (R 2 ) dos modelos de dispersão indicam uma maior aproximação do modelo de tanques de mistura completa em série (multi-CSTR), com uma média de 2,5; 2,3 e 1,2 (primeiro ano) e 1,1; 1,4 e 0,9 (segundo ano) reatores de mistura completa (multi-CSTR) em série para UASB1, UASB2 e FBAS, respectivamente. Os resultados realizados nos reatores UASB1, UASB2 e FBAS indicaram forte tendência do escoamento ao regime hidráulico de mistura completa, sendo detectada grande dispersão nas unidades, além da presença de curtos-circuitos e zonas mortas.Termos para indexação: Estudo hidrodinâmico; traçadores; tratamento biológico.

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Dispersion and treatment performance analysis of an UASB reactor under different hydraulic loading rates

Cited by 72 publications

References 7 publications

Modelo de Dispersión Axial para Sistemas de Flujo Continuo Ajustado a las Condiciones de Borde

Modelo de Dispersión Axial para Sistemas de Flujo Continuo Ajustado a las Condiciones de Borde

Review of Upflow Anaerobic Sludge Blanket Reactor Technology: Effect of Different Parameters and Developments for Domestic Wastewater Treatment

Hydrodynamic behavior of a combined anaerobic-aerobic system employed in the treatment of vinasse

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