Experimental and numerical assessment of the hydraulic behavior of a pilot-scale Periodic Anaerobic Baffled Reactor (PABR)

Michalopoulos, Ioannis; Kamperidis, Theofilos; Seintis, G.; Pashos, George; Lytras, C.; Παπαδοπούλου, Κωνσταντίνα; Boudouvis, Andreas G.; Lyberatos, Gérasimos

doi:10.1016/j.compchemeng.2018.01.014

Cited by 10 publications

(12 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It seems that the increase of the HRT/T ratio leads to increase of the CH 4 yield, which comes in agreement with the conclusions of a previous study assessing the hydraulic behavior of the PABR (Michalopoulos et al 2018).…”

Section: Resultssupporting

confidence: 92%

“…A number of studies have examined the performance of the PABR under various organic loading rates (OLRs), HRTs and Ts and by utilizing different types of feedstocks (Liu et al 2009;Michalopoulos et al 2017aMichalopoulos et al , 2019Skiadas et al 2000). A recent work by Michalopoulos et al 2018, described the hydraulic behaviour of a pilotscale PABR concluding in a relation between HRT/T values and the operation of the bioreactor. Specifically, they found that the reactor operates similarly to a plug-flow one at low HRT/T values, and as a continuous stirred-tank reactor (CSTR) at high HRT/T values (Michalopoulos et al 2018).…”

Section: The Periodic Anaerobic Baffled Reactor Pabrmentioning

confidence: 99%

“…A recent work by Michalopoulos et al 2018, described the hydraulic behaviour of a pilotscale PABR concluding in a relation between HRT/T values and the operation of the bioreactor. Specifically, they found that the reactor operates similarly to a plug-flow one at low HRT/T values, and as a continuous stirred-tank reactor (CSTR) at high HRT/T values (Michalopoulos et al 2018).…”

Section: The Periodic Anaerobic Baffled Reactor Pabrmentioning

confidence: 99%

See 2 more Smart Citations

Anaerobic digestion of dried/shredded food waste in a periodic anaerobic baffled reactor

Mathioudakis

Michalopoulos

Kalogeropoulos

et al. 2021

Water Science and Technology

Self Cite

View full text Add to dashboard Cite

The objective of the current work is to study the impact of the operational parameters' variation (HRT, OLR and T) on biomethane productivity in a Periodic Anaerobic Baffled Reactor (PABR). The feedstock used was a biomass product named FORBI (Food Residue Biomass), which is dried and shredded source-separated household food waste. The Periodic Anaerobic Baffled Reactor (PABR) is an innovative, high-rate bioreactor. Apart from the Hydraulic Retention Time (HRT) and the Organic Loading Rate (OLR), an important operational parameter is the Switching Period (T) of the feeding compartment: when T is high, the bioreactor operation is similar to an Anaerobic baffled reactor (ABR), while when it is low, the operation approaches that of an Upflow Anaerobic Sludge Blanket Reactor (UASBR). Nine distinct experimental phases were conducted, during which the operational parameters of the PABR were consecutively modified: the HRT varied from 9 to 2.5 days, T between 2 days and 1 and finally the OLR from 1.24 gCOD/Lbioreactor*d to 8.08 gCOD/Lbioreactor*d. The maximum biomethane yield was 384 LCH4/kgFORBI corresponding to the operation at HRT = 5 d, OLR = 2.14 gCOD/Lbioreactor*d and T = 2 days. Similar efficiency (333 LCH4/kgFORBI) was achieved at higher OLR (4.53 gCOD/Lbioreactor*d).

show abstract

Section: Resultssupporting

confidence: 92%

Section: The Periodic Anaerobic Baffled Reactor Pabrmentioning

confidence: 99%

Section: The Periodic Anaerobic Baffled Reactor Pabrmentioning

confidence: 99%

See 1 more Smart Citation

Anaerobic digestion of dried/shredded food waste in a periodic anaerobic baffled reactor

Mathioudakis

Michalopoulos

Kalogeropoulos

et al. 2021

Water Science and Technology

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, CFD modelling allows deeper hydrodynamic analysis including identification and location of dead zones, tracking of velocity profiles and flow patterns, mixing performance, and determination of the distribution of tracer concentration within the reactor (Climent et al 2018, Dapelo et al 2018, Michalopoulos et al 2018, Plascencia-Jatomea et al 2015, Terashima et al 2009, Trab et al 2015, Wei et al 2019. In addition, this advanced knowledge will be essential for the operational optimization of reactors with complex hydrodynamic behaviour such as AnoxAn in terms of avoiding the presence of dead flow zones or preferred channelling in the design.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of a novel anaerobic-anoxic reactor for biological nutrient removal: Model construction, validation and hydrodynamic analysis based on OpenFOAM®

Blanco-Aguilera

Lara

Barajas

et al. 2020

Chemical Engineering Science

View full text Add to dashboard Cite

AnoxAn is a novel multi-environment reactor for biological nutrient removal (BNR) from wastewater. Although its biological efficacy has been demonstrated on a pilot scale, hydrodynamics is observed to significantly affect the performance of AnoxAn. To study its complex hydraulic behaviour, a model based on Computational Fluid Dynamics 3D (CFD) is constructed using the OpenFOAM® open source toolbox and validated by experimental tests of Residence Time Distribution (RTD). Reactor elements represent a key factor in the modelling process. In this sense, the impeller of the anoxic zone is modelled as a flat disk, and the baffle after the anoxic zone as a porous media. According to CFD model simulations, stagnant, short-circuit zones and mixing quality are established and quantified. Finally, the influence on the hydrodynamics of reactor elements is also evaluated. The results of this detailed hydrodynamic analysis will form the basis for the design and optimization of scalable AnoxAn configurations.

show abstract

“…Several studies have investigated the hydrodynamics of modified septic tanks in the last decade. For instance, Sarathai et al (2010) fitted the experimental data obtained in a conventional anaerobic baffled reactor (ABR) into the axial dispersion and the tank-in-series models, while other authors (Ji et al, 2012;Li et al, 2015Li et al, , 2016Michalopoulos et al, 2018) studied modified versions of ABR; however, none of these analysed treatment units packed with zeolite. This material improves the final effluent quality, helping remove nutrients and organic matter, is cheap and readily available (Montalvo et al, 2012), making it an attractive option in decentralized systems.…”

mentioning

confidence: 99%

Comprehensive analysis of a zeolite‐packed upflow baffled septic tank using tracer tests and mathematical modelling

Santiago-Díaz

Benítez-Olivares

Peláez

et al. 2021

Water & Environment J

View full text Add to dashboard Cite

This work analysed the hydraulic behaviour and treatment efficiency of an upflow baffled septic tank (UBST) through tracer tests and mathematical modelling using the axial dispersion and the tank‐in‐series (TIS) models. The tracer tests were performed under different HRTs (12, 18 and 24 h) and configurations (UBST, UBST with sludge and UBST with sludge and zeolite filter). UBST followed a non‐ideal flow, and configuration modifications, rather than HRT, altered its hydraulic behaviour. Mathematical modelling indicated that the TIS model calculated with mean squared error (φ) described adequately UBST hydraulic behaviour (R2 = 0.9833). Additionally, UBST is recommended to operate under 24 h HRT to reach satisfactory hydraulic and pollutant removal efficiencies. At this HRT, total COD and ammonium removals were 75.1% and 49.3%, respectively, which were better than those obtained without the zeolite (71.2% and 1.8%, respectively). However, it quickly saturated, so it is necessary to deepen the research on this topic.

show abstract

Experimental and numerical assessment of the hydraulic behavior of a pilot-scale Periodic Anaerobic Baffled Reactor (PABR)

Cited by 10 publications

References 47 publications

Anaerobic digestion of dried/shredded food waste in a periodic anaerobic baffled reactor

Anaerobic digestion of dried/shredded food waste in a periodic anaerobic baffled reactor

CFD simulation of a novel anaerobic-anoxic reactor for biological nutrient removal: Model construction, validation and hydrodynamic analysis based on OpenFOAM®

Comprehensive analysis of a zeolite‐packed upflow baffled septic tank using tracer tests and mathematical modelling

Contact Info

Product

Resources

About