Extending and calibrating a mechanistic hindered and compression settling model for activated sludge using in-depth batch experiments

Clercq, Jeriffa De; Nopens, Ingmar; Defrancq, Jacques; Vanrolleghem, Peter A.

doi:10.1016/j.watres.2007.08.040

Cited by 70 publications

(48 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Importantly, the actual verification of concentration profiles in settling suspensions is non-trivial. The ability to monitor settling rates, sediment bed evolution and concentration changes (which are essential knowledge for optimizing process design [5,6]) is typically impeded due to the lack of convenient non-invasive measurement techniques [7].…”

Section: Introductionmentioning

confidence: 99%

In situ characterisation of a concentrated colloidal titanium dioxide settling suspension and associated bed development: Application of an acoustic backscatter system

et al. 2015

View full text Add to dashboard Cite

ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. eait.dean@uq.edu.au (S.Biggs). T.N.Hunter@leeds.ac.uk (T.N. Hunter).1 Present address: University of Queensland, Brisbane, Qld 4072, Australia 2 AbstractThe ability to accurately characterise the settling of particulate suspensions is imperative in numerous industries for improved processing, optimisation and control. Characterisation is typically a non-trivial process, and in situ measurements that remove the restriction of requiring particular sample sizes are preferred. Here for the first time, we explore the use of an acoustic backscatter system (ABS) to characterise key settling dynamics within a common colloidal mineral suspension, where backscatter attenuation is heightened due to the associated low scattering cross sections of the particles. Settling titanium dioxide dispersions with concentrations ranging 0.05 -3.00 vol% were successfully profiled using ABS transducers of 1, 2 and 4 MHz frequencies. This approach enabled the simultaneous visualisation of both the settling interface and sediment bed formation, generating sedimentation curves and eluding settling velocities. Furthermore, backscatter attenuation was empirically correlated with the attenuation-concentration relationship established for homogenous dispersions, to obtain concentration profiles of the settling suspensions. The data depicted concentration changes as a function of time in a hindered settling suspension, and allowed observation of the segregation of a size polydisperse suspension. Data were compared with sedimentation data obtained via two common ex situ bench-scale techniques. Critically, the acoustic backscatter method was validated as a powerful in situ characterisation tool for opaque concentrated heterogeneous dispersions, with the ability to provide concentration density information in conjunction with settling kinetics that is not easily attainable via other methods.

show abstract

Section: Introductionmentioning

confidence: 99%

In situ characterisation of a concentrated colloidal titanium dioxide settling suspension and associated bed development: Application of an acoustic backscatter system

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Mass balances allow the following partial differential equation and boundary conditions to be derived (more details on the derivation of the model PDE and boundary conditions can be found in several studies, including [5,7,8,16,18]:…”

Section: Modeling Of Batch Sedimentationmentioning

confidence: 99%

“…On this basis, a numerical solution procedure based on the MOL is developed in Section 3. In Section 4, model parameters are inferred from experimental data collected on a pilot plant [5][6][7]. A continuous settling model is then coupled to an activated sludge model, including anoxic and aerobic tanks, and simulation results are discussed in Section 5.…”

Section: Introductionmentioning

confidence: 99%

Settler dynamic modeling and MATLAB simulation of the activated sludge process

Damien

Vasel

Wouwer

2009

Chemical Engineering Journal

View full text Add to dashboard Cite

“…When the solids concentration further increases above a critical concentration (5-10 g L -1 ), the settling behaviour changes to compressive settling (Class IV). The exact transition concentration depends once more on the flocculation state of the particles (De Clercq et al, 2008). At these elevated concentrations, the solids come into physical contact with one another and are subjected to compaction due to the weight of overlying particles.…”

Section: Introductionmentioning

confidence: 99%

Experimental Methods in Wastewater Treatment

Loosdrecht¹,

Nielsen²,

López-Vázquez³

et al. 2016

Water Intelligence Online

143

View full text Add to dashboard Cite

PrefaceWastewater treatment is a core technology for water resources protection and reuse, as is clearly demonstrated by the great success of its consequent implementation in many countries worldwide. During the last decennia scientific research has made vast progress in understanding the complex and interdisciplinary aspects of the biological, biochemical, chemical and mechanical processes involved. It can be concluded that the global application of existing knowledge and experience in wastewater treatment technology will represent a cornerstone in future water management, as expressed in the Strategic Development Goals accepted by the UN in September 2015.Only about one fifth of the wastewater produced globally is currently being adequately treated. To achieve the goal for sustainable water management by 2030 would require extra wastewater treatment facilities for about 600,000 people each day. I am convinced that this book will make its own significant contribution to meeting this ambitious goal.In the near future, most of the global population will live in cities and in low and middle-income countries, where most wastewater is not adequately treated. Probably the most limiting factor in achieving the goals for sustainable water management is the lack of qualified, well-trained professionals, able to comprehend the scientific research results and transfer them into practice. It is therefore of prime importance to make currently available scientific advances and proven experiences in wastewater treatment technology applications easily accessible worldwide. This was one of the drivers for the development of this book, which represents an innovative contribution to help overcome such a capacity development challenge. The book is most definitely expected to contribute to bridging the gaps between the science and technology, and their practical applications.The great collection of authors and reviewers represents an interdisciplinary team of globally acknowledged experts. The book will therefore make a major contribution to establishing a common professional language, enhancing global communication between wastewater professionals. In addition, the authors have linked the description of the scientific basis for wastewater treatment processes with a video-based online course for the training of students, researchers, engineers, laboratory technicians and treatment plant operators, demonstrating commonly accepted experimentation procedures and their application for lab-, pilot-, and full-scale treatment plant operation.From the perspective of the IWA this book also has the great potential to enhance the development of a new generation of researchers and enable them to communicate on a global scale and beyond their specific field of expertise. Both aspects are urgently needed to develop adapted solutions for specific local conditions and to make them globally available for implementation.There has been a trend for some time that scientific research and practice have been growing apart from each other. Part of the rea...

show abstract

Extending and calibrating a mechanistic hindered and compression settling model for activated sludge using in-depth batch experiments

Cited by 70 publications

References 29 publications

In situ characterisation of a concentrated colloidal titanium dioxide settling suspension and associated bed development: Application of an acoustic backscatter system

In situ characterisation of a concentrated colloidal titanium dioxide settling suspension and associated bed development: Application of an acoustic backscatter system

Settler dynamic modeling and MATLAB simulation of the activated sludge process

Experimental Methods in Wastewater Treatment

Contact Info

Product

Resources

About