Identification and Localization of Hydrodynamic Anomalies in a Real Wastewater Treatment Plant by an Integrated Approach: RTD-CFD Analysis

Collivignarelli, Maria Cristina; Miino, Marco Carnevale; Manenti, Sauro; Todeschini, Sara; Sperone, Enrico; Cavallo, Gino; Abbà, Alessandro

doi:10.1007/s40710-020-00437-4

Cited by 15 publications

(5 citation statements)

References 42 publications

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“…Although pure oxygen is dosed in the ThMBR, the denitrification phenomenon can be attributed to the concomitant presence of (i) a high quantity of organic substance given the very high COD of the fed matrices and (ii) some areas of the reactor that remain without adequate oxygenation. These results highlight that a study of the hydrodynamic behavior of the reactor by a residence time distribution (RTD) analysis and/or a computational fluid dynamic (CFD) analysis, as already done in conventional WWTP [56,57], is greatly required. The presence of the same denitrification phenomena was also observed in the other full-scale ThMBR in our previous study [35].…”

Section: Performance On Chemical Pollutants and Sludge Productionmentioning

confidence: 97%

Performance of Full-Scale Thermophilic Membrane Bioreactor and Assessment of the Effect of the Aqueous Residue on Mesophilic Biological Activity

Collivignarelli

Miino

Caccamo

et al. 2021

Water

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To date, the management of high-strength wastewater represents a serious problem. This work aims to evaluate the performance on chemical pollutants and on sludge production of one of the two full-scale thermophilic membrane bioreactors (ThMBRs) currently operational in Italy, based on monitoring data of the last two and a half years. Removal yields on COD, N-NOx, non-ionic and anionic surfactants (TAS and MBAS), increased with the input load up to 81.9%, 97.6%, 94.7%, and 98.4%, respectively. In the period of stability, a very low value of sludge production (0.052 kgVS kgCOD−1) was observed. Oxygen uptake rate (OUR) tests allowed us to exclude the possibility that mesophilic biomass generally exhibited any acute inhibition following contact with the aqueous residues (ARs), except for substrates that presented high concentrations of perfluoro alkyl substances (PFAS), cyanides and chlorides. In one case, nitrifying activity was partially inhibited by high chlorides and PFAS concentration, while in another the substrate determined a positive effect, stimulating the phenomenon of nitrification. Nitrogen uptake rate (NUR) tests highlighted the feasibility of reusing the organic carbon contained in the substrate as a source in denitrification, obtaining a value comparable with that obtained using the reference solution with methanol. Therefore, respirometric tests proved to be a valid tool to assess the acute effect of AR of ThMBR on the activity of mesophilic biomass in the case of recirculation.

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Section: Performance On Chemical Pollutants and Sludge Productionmentioning

confidence: 97%

Performance of Full-Scale Thermophilic Membrane Bioreactor and Assessment of the Effect of the Aqueous Residue on Mesophilic Biological Activity

Collivignarelli

Miino

Caccamo

et al. 2021

Water

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“…Finally, deepening our understanding of the rheological behaviour of SeS is a crucial aspect also in the design of new WWTPs and when searching potential hydrodynamic anomalies in the existing ones. In fact, recently, the optimization of the WWTPs gain interest to enhance performances of pollutants removal and reduce the chemical and energy consumption (El-Sheikh 2011;Drewnowski 2019;Borzooei et al 2020;Collivignarelli et al 2020b). However, as suggested by Ratkovich et al (2013), the hydraulic mathematical modelling of the dynamic flow of SeS inside the reactors is highly improved by a proper evaluation of the shear stress that can be assessed studying the apparent viscosity.…”

Section: Discussion About the Importance Of Knowledge Of Ses Rheological Behaviourmentioning

confidence: 99%

Review of rheological behaviour of sewage sludge and its importance in the management of wastewater treatment plants

Collivignarelli

Miino

Bellazzi

et al. 2021

Water Practice and Technology

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The process operation of wastewater treatment plants (WWTPs) is based on the proper set up of several physical, chemical and biological parameters. Often, issues and problems arising in the process are strictly linked to the rheological behaviour of sewage sludge (SeS). Therefore, rheological measurements, which recently have captured a growing interest, represent an important aspect to consider in the design and operation of WWTPs, especially in the sludge-handling processes. The knowledge of rheological behaviour of SeS represents a crucial step to better understands its flow behaviour and therefore optimize the performance of the processes, minimizing the costs. The SeS are non-Newtonian fluids and, to date, Bingham and Ostwald models are the most applied. This work presents an overview of scientific literature about the rheological properties of SeS and discusses the importance of its knowledge for the management of WWTPs.

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“…With continued growth of computational power and advances in CFD techniques, even complex models can be done on commodity hardware. Thus, CFD modeling is routinely applied in several fields of science and engineering such as chemistry, 2,3 materials, 4 fluid flow and heat transfer, 5,6 biology, 7 drug delivery, 8 semiconductors, 9 environmental engineering, 10,11 biomedical engineering, 12 and aeronautics 13…”

Section: Introductionmentioning

confidence: 99%

Iterative symbolic regression for learning transport equations

et al. 2022

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Computational fluid dynamics (CFD) analysis is widely used in chemical engineering. Although CFD calculations are accurate, the computational cost associated with complex systems makes it difficult to obtain empirical equations between system variables. Here, we combine active learning (AL) and symbolic regression (SR) to get a symbolic equation for system variables from CFD simulations. Gaussian process regression‐based AL allows for automated selection of variables by selecting the most instructive points from the available range of possible parameters. The results from these experiments are then passed to SR to find empirical symbolic equations for CFD models. This approach is scalable and applicable for any desired number of CFD design parameters. To demonstrate the effectiveness, we use this method with two model systems. We recover an empirical equation for the pressure drop in a bent pipe and a new equation for predicting backflow in a heart valve under aortic insufficiency.

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Identification and Localization of Hydrodynamic Anomalies in a Real Wastewater Treatment Plant by an Integrated Approach: RTD-CFD Analysis

Cited by 15 publications

References 42 publications

Performance of Full-Scale Thermophilic Membrane Bioreactor and Assessment of the Effect of the Aqueous Residue on Mesophilic Biological Activity

Performance of Full-Scale Thermophilic Membrane Bioreactor and Assessment of the Effect of the Aqueous Residue on Mesophilic Biological Activity

Review of rheological behaviour of sewage sludge and its importance in the management of wastewater treatment plants

Iterative symbolic regression for learning transport equations

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