Improvement in biomass characteristics and degradation efficiency in modified UASB reactor treating municipal sewage: a comparative study with UASB reactor

Das, Soumen

doi:10.1002/apj.298

Cited by 6 publications

(7 citation statements)

References 19 publications

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“…Con el uso de estos reactores se han reportado eficiencias de remoción de demanda química de oxígeno (DQO) y de sólidos suspendidos totales (SST) superiores al 60 % y 50 %, respectivamente (Elmitwalli et al 2003, Halalsheh et al 2005, Das y Chaudhari 2009. Sin embargo, los efluentes suelen requerir postratamiento para mejorar su calidad, lo que puede ser visto como una desventaja del proceso de tratamiento anaerobio.…”

Section: Introductionunclassified

Tratamiento De Agua Residual Doméstica Mediante Un Reactor Rafa Y Una Celda Microbiana De Combustible

Martínez-Santacruz

Herrera-López

Gutiérrez-Hernández

et al. 2016

Rev. Int. Contam. Ambie.

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Palabras clave: digestión anaerobia, remoción de materia orgánica, sistema acoplado, densidad de potencia, eficiencia coulómbica RESUMENSe evaluó el desempeño de un sistema compuesto por un reactor anaerobio de flujo ascendente (RAFA) y una celda microbiana de combustible (CMC) en el tratamiento de agua residual de baja carga, así como la recuperación de energía de este sistema. El reactor RAFA (1 L) se alimentó de manera continua con agua residual domés-tica bajo tiempos de retención hidráulica (TRH) de 12 y 6 h. La CMC (250 mL) fue operada por lotes y alimentada con agua residual cruda (TRH = 12 h) o con el efluente del reactor RAFA (TRH = 6 h). Se encontró que la remoción de materia orgánica en el sistema acoplado RAFA-CMC (88 % en demanda química de oxígeno (DQO), 75 % de carbono orgánico total (COT) y 79 % de sólidos suspendidos totales (SST)) fue superior a los niveles observados en el reactor RAFA (76 % DQO, 66 % COT y 73 % SST) y en la CMC (60 % DQO, 53 % COT y 40 % SST) cuando estos fueron operados de manera individual. La mayor densidad de potencia obtenida con la CMC fue de 176 mW/m 2 , utilizando una resistencia de 1000 Ω, en tanto que la eficiencia coulómbica fue de 8 %. El sistema RAFA-CMC demostró ser una buena alternativa para el tratamiento de agua residual y la generación simultánea de electricidad aún bajo condiciones de limitación de sustrato, es decir, con baja concentración de materia orgánica en el influente.Key words: anaerobic digestion, organic matter removal, coupled system, power density, coulombic efficiency ABSTRACTThe performance of a system consisting of an up-flow anaerobic sludge blanket (UASB) reactor and a microbial fuel cell (MFC) for the treatment of low-strength wastewater and the recovery of energy was evaluated. The UASB reactor (1 L) was continuously fed with raw domestic wastewater under hydraulic retention times (HRT) of 12 and 6 h. The MFC (250 mL) was operated in batch mode and fed with either raw wastewater (HRT = 12 h) or the effluent from the UASB reactor (HRT = 6 h). It was found that the removal of organic matter by the coupled UASB-MFC system (88 % chemical

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Section: Introductionunclassified

Tratamiento De Agua Residual Doméstica Mediante Un Reactor Rafa Y Una Celda Microbiana De Combustible

Martínez-Santacruz

Herrera-López

Gutiérrez-Hernández

et al. 2016

Rev. Int. Contam. Ambie.

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“…On the other hand, substrate transport limitation may occur in UASB and HUASB reactor due to low mixing during the treatment of LSW. Lower performance of UASB due to poor removal of suspended organic matter during the treatment of LSW has been observed by many researchers [29][30][31].…”

Section: Blanket (Muasb) Reactorsmentioning

confidence: 92%

“…Mixing can facilitate the release of produced gas in bioreactor. Therefore, higher turbulence in MUASB may help gas bubble to release from granular surface [27].Researchers have reported lower efficiency of UASB reactor during the treatment of low strength complex wastewaters due to the lower removal of suspended organic matter [28][29][30][31].Therefore, the presence of TSS possibly reduces the efficiency of UASB reactor during the treatment of municipal sewage in this study. Low influent COD results in low gas production, thereby decreasing the collision opportunity of influent solids with sludge biomass.…”

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confidence: 88%

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Effect of reactor configuration on performance during anaerobic treatment of low strength wastewater

Das

2015

Environmental Technology

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The efficiency of the up-flow anaerobic sludge blanket (UASB) reactor is quite low for the treatment of low strength wastewaters (LSWs) due to less biogas production leading to poor mixing. LSW may be treated efficiently by providing adequate mixing in the UASB reactor when gas production is low, and sufficient mixing can be achieved by modifying reactor geometry. Hence, modifying UASB reactor geometry for enhanced mixing and evaluating its performance for the treatment of LSWs would be a worthwhile effort. In the present study, UASB reactor configuration was modified by providing a vertical baffle along the height to promote mixing of reactor contents, and is termed as modified UASB (MUASB). The performance of an on-site pilot-scale MUASB reactor was evaluated for 375 days under ambient condition for the treatment of municipal sewage as LSW and compared with that of the conventional UASB and hybrid UASB (HUASB) reactors. The MUASB reactor showed better performance in terms of chemical oxygen demand (COD) removal efficiency as compared with UASB and HUASB reactors during this study. At 4 h hydraulic retention time, the total COD removal efficiency of UASB and HUASB reactors was 53.7% and 61%, respectively, which were much lower than the total COD removal efficiency of the MUASB reactor (72.7%). The better performance observed in the MUASB reactor is possibly due to improved mixing. Depth-wise analysis of reactor liquid showed that better mixing in the MUASB reactor enhances the contact of wastewater with biomass, which contributes to the improved treatment efficiency. It seems that MUASB holds promise for LSW treatment.

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“…This prevented the washout of biomass, paving the way for better substrate removal. Granule size of the MUASB (1.7 mm) was found to be less compared with the conventional UASB (2.8 mm) (Das & Chaudhari, 2009). But density of the MUASB granule was higher.…”

Section: Factors Affecting the Reactor Performancementioning

confidence: 99%

A review on upflow anaerobic sludge blanket reactor: Factors affecting performance, modification of configuration and its derivatives

Swathi

2022

Water Environment Research

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The upflow anaerobic sludge blanket (UASB) reactor can be considered as one of the promising anaerobic wastewater treatment technologies suitable for the treatment of high-strength wastewater. In the recent period, researchers have focused on the treatment of low-strength wastewater using this technology. This review focuses on the key factors affecting the reactor performance such as hydraulic retention time (HRT), temperature, organic loading rate (OLR), pH and alkalinity, granulation, wastewater characteristics, mixing, and modification to conventional configuration. Start-up and granulation played a major role in the determination of reactor performance, and various theories have been proposed to understand the mechanism of granulation. Correlation between start-up time and OLR was found to be low, as other operating parameters might have been influencing the start-up time. Flowchart depicting the development of UASB reactor over time is included. In the present work, further development and derivatives of the UASB reactor such as static granular bed reactor (SGBR) and expanded granular sludge bed (EGSB) reactor are analyzed. The optimal conditions for UASB for treating various types of substrates was found to be HRT of 3-24 h, OLR of 1-15 kg COD/m 3 /d, and operational temperature in mesophilic range (30-40 C). Analysis of various modifications that pave the way for identification of future areas of research to improve reactor performance is also presented. Practitioner Points• Governing factors for better operating conditions are presented.• Attaining start-up with respect to various substrates is discussed.• Factors responsible for increase in efficiency, further developments and derivatives of UASB are depicted.

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Improvement in biomass characteristics and degradation efficiency in modified UASB reactor treating municipal sewage: a comparative study with UASB reactor

Cited by 6 publications

References 19 publications

Tratamiento De Agua Residual Doméstica Mediante Un Reactor Rafa Y Una Celda Microbiana De Combustible

Tratamiento De Agua Residual Doméstica Mediante Un Reactor Rafa Y Una Celda Microbiana De Combustible

Effect of reactor configuration on performance during anaerobic treatment of low strength wastewater

A review on upflow anaerobic sludge blanket reactor: Factors affecting performance, modification of configuration and its derivatives

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