Granular sludge formation in upflow anaerobic sludge blanket (UASB) reactors

Schmidt, Jens Ejbye; Ahring, Birgitte Kiær

doi:10.1002/(sici)1097-0290(19960205)49:3<229::aid-bit1>3.0.co;2-m

Cited by 458 publications

(238 citation statements)

References 109 publications

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“…Significant SOUR values would be the presence of aerobic heterotrophic or facultative anaerobic microorganisms. The SMA observed in the reactors in period 1 was in the range reported by Schmidt and Ahring (1996), i.e., 0.41-1.75 mmol CH 4 / g VSS·h for anaerobic granular sludges from upflow anaerobic sludge blanket reactors.…”

Section: Effect Of Electron Acceptor Combination In Bioreactor Perforsupporting

confidence: 60%

Transient Performance of Two-Electron Regime Bioreactors That Contained Unacclimated Biocatalysts After Feeding Perchloroethylene

Moreno-Medina

Poggi‐Varaldo

Bretón-Deval

et al. 2017

Rev. Int. Contam. Ambie.

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The objective of this work was to assess the impact of perchloroethylene (PCE) and coupled zero valent iron (ZVI) filters on the transient performance of fluidized bed bioreactors (FBBRs) operated in simultaneous electron acceptors modes. Four lab scale, FBBRs were implemented. Two FBBRs were operated as simultaneous methanogenicdenitrifying (MD) units, whereas the other two were operated in partially-aerated methanogenic (PAM) mode. In the first period all FBBRs received a synthetic wastewater with 1 g COD-methanol/L. In a second period, all the FBBRs received the synthetic wastewater plus 80 mg PCE/L. At the start of period 2, one MD and one PAM FBBRs were coupled to side sand-ZVI filters. All bioreactors anchored microbial consortia unacclimated to PCE. In this work, bioreactor performance in the full period 1 and the first 15 days of period 2 (transient state) is reported and discussed. The chemical oxygen demand and the nitrate removal efficiency of the FBBRs did not decrease between period 1 and period 2, i.e., upon PCE addition, particularly for MD bioreactors. On the contrary, specific oxygen uptake rate of all FBBRs in period 2 decreased by ca. 80 to 96 % or more compared to period 1. In period 2, PCE removals and dehalogenation efficiency were in the range of 81 to 94 % and 73 to 90 %, respectively. The highest values corresponded to PAM bioreactors, particularly for that equipped with ZVI filter. Slight positive effects of ZVI filter on PCE removal and the dehalogenation efficiencies were observed in the PAM ZVI bioreactor configuration. It is concluded that the simultaneous electron acceptor type (PAM vs. MD) had a significant effect on the bioreactor performance, whereas the coupling to ZVI filters only had a slight positive effect on the bioreactor performance in the PAM-ZVI bioreactor.Palabras clave: lecho fluidizado, metanogénico con aereación parcial simultáneo, metanogénico-desnitrificante simultáneo, hierro metálico 84 RESUMENEl objetivo del presente trabajo fue evaluar el impacto del filtro acoplado de hierro cero-valente sobre el desempeño de biorreactores de lecho fluidizado (BLEF) operados con aceptores simultáneos de electrones y sometidos a altas concentraciones de percloroetileno (PCE). Se utilizaron cuatro BLEF a escala laboratorio, dos operados en metanogénesis con aireación parcial (MAP) y dos metanogénicos-desnitrificantes (MD). En el primer periodo todos los BLEF se alimentaron con agua residual sintética y 1 g de COD-metanol/L. En el segundo periodo todos los BLEF recibieron la misma agua residual sintética más 80 mg PCE/L. A un BLEF MAP y un BLEF MD se les acopló un filtro de arena-partículas de hierro metálico. A partir de ese momento se operó lo que denominamos estado transitorio de los primeros 15 días. Todos los biorreactores fueron inoculados originalmente con un consorcio no aclimatado a PCE. En este trabajo se reporta el periodo 1 completo y el efecto inicial (15 días) del PCE y los filtros de arena-hierro metálico acoplados a los biorreactores (periodo 2). La eli...

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Section: Effect Of Electron Acceptor Combination In Bioreactor Perforsupporting

confidence: 60%

Transient Performance of Two-Electron Regime Bioreactors That Contained Unacclimated Biocatalysts After Feeding Perchloroethylene

Moreno-Medina

Poggi‐Varaldo

Bretón-Deval

et al. 2017

Rev. Int. Contam. Ambie.

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“…Several studies have shown that granular sludge formation is related mainly to the presence of methanogens (Liu et al, 2003;Schmidt and Ahring, 1996). However, methanogens are highly sensitive to high sulfide concentrations, whereas propionibacteria, which are nucleation centers of the granules, are outcompeted by SRB in the presence of sulfide (Oyekola et al, 2009).…”

Section: Effect Of the Reactor Configuration On Sulfate Removalmentioning

confidence: 99%

Comparison of Uasb and Fluidized-Bed Reactors for Sulfate Reduction

Bertolino

Silva

Aquino

et al. 2015

Braz. J. Chem. Eng.

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-Reactor hydrodynamics is important for sulfidogenesis because sulfate reduction bacteria (SRB) do not granulate easily. In this work, the sulfate reduction performance of two continuous anaerobic bioreactors was investigated: (i) an upflow anaerobic sludge blanket (UASB) reactor and (ii) a fluidized bed reactor (FBR). Organic loading, sulfate reduction, and COD removal were the main parameters monitored during lactate and glycerol degradation. The UASB reactor with biomass recirculation showed a specific sulfate reduction rate of 0.089±0.014 g.gSSV -1 .d -1 (89% reduction), whereas values twice as high were achieved in the FBR treating either lactate (0.200±0.017 g.gSSV -1 .d -1 ) or glycerol (0.178±0.010 g.gSSV -1 .d -1 ). Sulfate reduction with pure glycerol produced a smaller residual COD (1700 mg.L -1 ) than that produced with lactate (2500 mg.L -1 ) at the same COD.sulfate -1 mass ratio. It was estimated that 50% of glycerol degradation was due to sulfate reduction and 50% to fermentation, which was supported by the presence of butyrate in the FBR effluent. The UASB reactor was unable to produce effluents with sulfate concentrations below 250 mg.L -1 due to poor mixing conditions, whereas the FBR consistently ensured residual sulfate concentrations below such a value.

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“…The expression for W s (z, t) for sludge solids can be derived from the Stokes law under Re<2, the region in which UASB reactors usually operate [33]:…”

Section: Vertical Velocity Of Granular Sludgementioning

confidence: 99%

Dispersed plug flow model for upflow anaerobic sludge bed reactors with focus on granular sludge dynamics

Kalyuzhnyi

Fedorovich

Lens

2005

J IND MICROBIOL BIOTECHNOL

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A new approach to model upflow anaerobic sludge bed (UASB)-reactors, referred to as a onedimensional dispersed plug flow model, was developed. This model focusses on the granular sludge dynamics along the reactor height, based on the balance between dispersion, sedimentation and convection using onedimensional (with regard to reactor height) equations. A universal description of both the fluid hydrodynamics and granular sludge dynamics was elaborated by applying known physical laws and empirical relations derived from experimental observations. In addition, the developed model includes: (1) multiple-reaction stoichiometry, (2) microbial growth kinetics, (3) equilibrium chemistry in the liquid phase, (4) major solid-liquid-gas interactions, and (5) material balances for dissolved and solid components along the reactor height. The integrated model has been validated with a set of experimental data on the start-up, operation performance, sludge dynamics, and solute intermediate concentration profiles of a UASB reactor treating cheese whey [Yan et al. (1989)

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Granular sludge formation in upflow anaerobic sludge blanket (UASB) reactors

Cited by 458 publications

References 109 publications

Transient Performance of Two-Electron Regime Bioreactors That Contained Unacclimated Biocatalysts After Feeding Perchloroethylene

Transient Performance of Two-Electron Regime Bioreactors That Contained Unacclimated Biocatalysts After Feeding Perchloroethylene

Comparison of Uasb and Fluidized-Bed Reactors for Sulfate Reduction

Dispersed plug flow model for upflow anaerobic sludge bed reactors with focus on granular sludge dynamics

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