Mechanisms and models for anaerobic granulation in upflow anaerobic sludge blanket reactor

Liu, Yu; Xu, Haipeng; Yang, Shu-Fang; Tay, Joo‐Hwa

doi:10.1016/s0043-1354(02)00351-2

Cited by 264 publications

(160 citation statements)

References 63 publications

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“…These values are consistent with those reported in other studies for conventional UASB reactors (Yoda and Nishimura, 1997;Bhunia and Ghangrekar, 2007). Considering that most of the zeolites used in the investigation had a diameter less than 1/24 th that of the larger granules generated in the reactor bed ( Figure 6 shows granules up to 6 mm), it is possible to believe that the formation of these granules corresponds to those described by the inner-core model (Liu et al, 2003). This model states that, in the presence of inert particles, the anaerobic microorganisms present in a UASB reactor could adhere to the surface of the particles to form bio-layer-driven initialization of the granules, wherein the first step of granulation would be the surface fixation of microorganisms, thus forming the core to establish the biolayers model.…”

Section: Granulation Processsupporting

confidence: 91%

Anaerobic Digestion of Wastewater With High Sulfate Concentration Using Micro-Aeration and Natural Zeolites

Montalvo

Prades

González

et al. 2016

Braz. J. Chem. Eng.

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-The behavior of anaerobic digestion in batch and UASB reactors using a microaerobic process and natural zeolites was studied. Laboratory assays were carried out across 4 sets of variables: different COD/SO 4 2-ratios, different airflow levels, with and without natural zeolites and room and mesophilic controlled temperatures. The microaerobic process demonstrated hydrogen sulfide removal levels exceeding 90% in most cases, while maintaining the flammable condition of the generated biogas. The level of COD removal exceeded 75% in UASB reactors despite their operation under very low hydraulic retention times (2.8-4.8 hours). The effectiveness of natural zeolites in accelerating UASB reactor startup was demonstrated.Results showing the positive influence of zeolites on the granulation process in UASB reactors were also achieved.

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Section: Granulation Processsupporting

confidence: 91%

Anaerobic Digestion of Wastewater With High Sulfate Concentration Using Micro-Aeration and Natural Zeolites

Montalvo

Prades

González

et al. 2016

Braz. J. Chem. Eng.

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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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“…Granular sludge can be developed using non-granular material for inoculation. Although, there are reports of wastewaters containing high-suspended solids being successfully treated in UASB reactors without primary sedimentation, the separation of suspended solids is still suggested, especially for reactors having non-granular configuration (Habeeb, 2011;Tiwari, et al, 2005;Liu et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Studies on Efficiency of UASB Reactor during Sludge Granulation

2017

Nov. 20-22, 2017 Kuala Lumpur (Malaysia) SETH-17, CAENS-17, BDMCE-17, FEWCMB-17, ANPMS-17, ELBIS-17 &Amp; LHSRS-17

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Mechanisms and models for anaerobic granulation in upflow anaerobic sludge blanket reactor

Cited by 264 publications

References 63 publications

Anaerobic Digestion of Wastewater With High Sulfate Concentration Using Micro-Aeration and Natural Zeolites

Anaerobic Digestion of Wastewater With High Sulfate Concentration Using Micro-Aeration and Natural Zeolites

Comparison of Uasb and Fluidized-Bed Reactors for Sulfate Reduction

Studies on Efficiency of UASB Reactor during Sludge Granulation

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