Distribution and behavior of sludge in upflow reactors for anaerobic treatment of wastewater

Buijs, C.; Heertjes, P.M.; Meer, Robert R. van der

doi:10.1002/bit.260240906

Cited by 19 publications

(5 citation statements)

References 3 publications

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“…Buijs et al (1982) reported that the sludge transport efficiency of up-moving biogas can reach up to 20.2 ± 2.1 m 3 /m 3 (sludge/biogas) in a UASB reactor [16]. Figure 1 suggested that the downward transport of sludge ( ϕ m , n , Kg h −1 ) from Δ V n to Δ V n −1 was caused due to the settling of sludge and by the back mix stream [13].…”

Section: Characteristics Of Anaerobic Bioreactormentioning

confidence: 99%

Characteristics, Process Parameters, and Inner Components of Anaerobic Bioreactors

Abdelgadir

Chen

Liu

et al. 2014

BioMed Research International

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The anaerobic bioreactor applies the principles of biotechnology and microbiology, and nowadays it has been used widely in the wastewater treatment plants due to their high efficiency, low energy use, and green energy generation. Advantages and disadvantages of anaerobic process were shown, and three main characteristics of anaerobic bioreactor (AB), namely, inhomogeneous system, time instability, and space instability were also discussed in this work. For high efficiency of wastewater treatment, the process parameters of anaerobic digestion, such as temperature, pH, Hydraulic retention time (HRT), Organic Loading Rate (OLR), and sludge retention time (SRT) were introduced to take into account the optimum conditions for living, growth, and multiplication of bacteria. The inner components, which can improve SRT, and even enhance mass transfer, were also explained and have been divided into transverse inner components, longitudinal inner components, and biofilm-packing material. At last, the newly developed special inner components were discussed and found more efficient and productive.

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Section: Characteristics Of Anaerobic Bioreactormentioning

confidence: 99%

Characteristics, Process Parameters, and Inner Components of Anaerobic Bioreactors

Abdelgadir

Chen

Liu

et al. 2014

BioMed Research International

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“…Consequently, in the description of the fluid flow pattern, two ideal mixers were taken for these two areas (Bernard et al, 2001;Bolle et al, 1986;Buijs et al, 1982;Ojha and Singh, 2002;Singhal et al, 1998;Van der Meer and Heertjes, 1983). The recirculation tank was considered as the third ideal mixer (Fig.…”

Section: Hydrodynamics Of the Fermentermentioning

confidence: 99%

Effect of ferrous ion on the biological activity in a UASB reactor: Mathematical modeling and verification

Vlyssides

Barampouti²,

Mai³

2006

Biotech & Bioengineering

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The effect of ferrous ion on the biological activity in a upflow anaerobic sludge blanket (UASB) reactor was studied. A mathematical model was developed and validated in order to simulate the dynamic behavior of a UASB reactor. This model took into consideration of all the biological and physicochemical reactions. The model was able to simulate the accumulation of iron in the sludge bed and its effect on the biological activity of the anaerobic sludge. A significant increase in the maximum uptake rate of methanogens and acidogens was revealed when iron was supplemented to the UASB reactor. The addition of ferrous iron induced a stable and excellent COD conversion rate. The model can be a useful tool for the prediction of process performance in the future and can be used to assist in the operation of biogas plants. The ferrous ion addition proved to enhance the biological activity of UASB sludge. Thus, the model can be used for the design of treatment plants that will take advantage of the benefits of iron addition.

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“…Consequently, in the description of the fluid flow pattern, two ideal mixers were taken for these two areas. 15,[35][36][37][38][39] The recirculation tank was considered as the third ideal mixer (Figure 3).…”

Section: Hydrodynamics Of the Fermentermentioning

confidence: 99%

An alternative approach of UASB dynamic modeling

2007

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in Wiley InterScience (www.interscience.wiley.com).A mathematical model was developed and validated to simulate the dynamic behavior of a UASB reactor. This model took into consideration all the biological and physicochemical reactions. Seven microbial populations were selected using Monod kinetics where inhibition terms were added. The overall biological reactions were determined by first evaluating the reactions for energy and synthesis separately and then adding them together. For each differential time interval, the biomass produced was estimated from the stoichiometry of these reactions. The feasibility of each reaction was determined by thermodynamic calculations. A thermodynamic solution was suggested for the microorganisms that are able to follow more than one catabolic routes and produce several products in spite of the fact that they consume just one substrate. All the reactions that may be performed were realized according to the relative percentage of their free energies. The validation of the model was based on a set of dynamical experiments designed to cover a wide spectrum of operating conditions that are likely to take place in the practical operation of a UASB plant. The model can be a useful tool for the prediction of process performance in transient conditions, even in failure, and can be used to assist in the operation of biogas plants.

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Distribution and behavior of sludge in upflow reactors for anaerobic treatment of wastewater

Cited by 19 publications

References 3 publications

Characteristics, Process Parameters, and Inner Components of Anaerobic Bioreactors

Characteristics, Process Parameters, and Inner Components of Anaerobic Bioreactors

Effect of ferrous ion on the biological activity in a UASB reactor: Mathematical modeling and verification

An alternative approach of UASB dynamic modeling

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