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      Evaluación de un reactor de manto de lodo con flujo ascendente (UASB) con cambios de velocidad de alimentación Translated title: Evaluation of an Upflow Anaerobic Sludge Blanket Reactor (UASB) with Changes in the Upflow Velocity

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          Abstract

          En este estudio se trataron, en un reactor tipo "manto de lodo anaerobio de flujo ascendente" (UASB) de 2,500 m³, aguas residuales de una empresa de bebidas fermentadas. Se investigó principalmente el efecto por el cambio de la velocidad ascendente de alimentación de 1 a 0.5 m/h sobre la pérdida de biomasa (SSV) a la salida del reactor, así como la eficiencia de remoción de la demanda química de oxígeno (DQO) y la producción de biogás. La pérdida de biomasa en el efluente varió de 1,342 a 436 mg/L, la eficiencia de remoción de la DQOsoluble cambió de 78.6 a 95.4% y la tasa de conversión de la DQO removida a biogás fue entre 0.439 y 0.491 m³ de biogás/kg de DQOsoluble,. En todas las etapas de estudio, se mantuvo un sistema estable dado la baja concentración de ácidos grasos volátiles (AGV) y un pH (7.1) sin cambios. A una velocidad ascendente de alimentación de 0.5 m/h se presentó la menor pérdida de biomasa, una eficiencia de remoción de DQOsoluble de 94% y una producción de biogás de 0.467 m³/kg de DQOsoluble removido.

          Translated abstract

          In this study wastewaters of a fermented beverages industry were treated in an up-flow anaerobic sludge blanket reactor (UASB) with a volume of2,500 m³. The work investigated primarily the effect of the upflow velocity from 1 to 0.5 m/h in the biomass washout in the reactor outlet, as well as the chemical oxygen demand (COD) removal efficiencies and the biogas production. The biomass washout in the reactor outlet ranging between 1342 and 436 mg/L, the removal efficiencies of soluble COD varied from 78.6 to 95.4% and the conversion rate of removed COD to biogas was between 0.439 and 0.491 m³ of biogas/kg of soluble COD. During the study a stable anaerobic system was maintained as indicated by a low volatile fatty acids (VFA) concentration and a stable pH. The reactor performance at an upflow velocity of 0.5 m/h resulted in the smaller loss of biomass, a soluble COD removal efficiency of 94% and a biogas production of 0.467 m³/kg of soluble DQO removal.

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          Design and analysis of experiments

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            Advanced anaerobic wastewater treatment in the near future

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              Evaluation of a upflow anaerobic sludge blanket reactor with partial recirculation of effluent used to treat wastewaters from pulp and paper plants.

              The main purpose of this study was to evaluate the performance of a UASB reactor treating diluted black liquor from a Kraft pulp mill, which simulates an unbleached Kraft plant wastewater, under different operational conditions, including partial recycling of the effluent. The reactor's performance was evaluated from the standpoint of COD, pH, volatile acid concentration, alkalinity, concentration of methane in the biogas, and microbiological examinations of the sludge. Without recirculation the reduction of the HRT from 36 to 30h did not significantly affect the average COD removal efficiency. The parameter displaying the greatest variation was the average concentration of effluent volatile acids, which increased by 16%. With recirculation the reduction of the HRT from 30 to 24h increased the average COD removal efficiency from 75% to 78%. In this case, the average effluent alkalinity also showed an increase. The use of partial recirculation of the effluent did not improve significantly the COD removal under the operational conditions tested in this work, but it was possible to operate the reactor with lower hydraulic retention time without disintegration of the granules.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                iit
                Ingeniería, investigación y tecnología
                Ing. invest. y tecnol.
                Facultad de Ingeniería, UNAM (México )
                1405-7743
                June 2011
                : 12
                : 2
                : 199-208
                Affiliations
                [1 ] Universidad de Guadalajara Mexico
                [2 ] Universidad de Guadalajara Mexico
                Article
                S1405-77432011000200009
                c951f9bf-ff05-4785-947a-0d188d7930bf

                http://creativecommons.org/licenses/by/4.0/

                History
                Categories
                Engineering, Multidisciplinary

                General engineering
                anaerobic process,UASB reactor,wastewater,procesos anaerobios,reactor UASB,aguas residuales

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