Modelling and characterization of primary settlers in view of whole plant and resource recovery modelling

Bachis, Giulia; Maruéjouls, Thibaud; Tik, Sovanna; Amerlinck, Youri; Melcer, Henryk; Lessard, Paul; Vanrolleghem, Peter

doi:10.2166/wst.2015.455

Cited by 23 publications

(20 citation statements)

References 26 publications

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“…For example, in Figure and in Figure , the PSVD fractions are depicted versus the TSS concentrations for the settling velocities of 120 and 3.4 m/h, respectively. In both cases, a linear tendency can be observed similar to the relations observed in previous studies (e.g., Maruéjouls, Lessard, and Vanrolleghem () and Bachis et al ()). This tendency also confirms that at higher TSS concentrations, the fraction of fast settling particles is higher (i.e., lower PSVD curves).…”

Section: Resultssupporting

confidence: 89%

“…Both methods have been extensively used and applied to characterize stormwater, sewage, and wastewater along the WRRFs treatment chain. Moreover, their reliability and reproducibility have been proven (Bachis et al, ; Berrouard, ; Maruéjouls, Lessard, & Vanrolleghem, ). In this case, no sample pretreatment was applied to not modify the raw sample and to not loose any particles.…”

Section: Methodsmentioning

confidence: 99%

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Characterizing the settleability of grit particles

Plana

Pauléat²,

Gadbois³

et al. 2019

Water Environment Research

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Grit chambers are installed at the headworks of a water resource recovery facility (WRRF) to reduce the impact of grit particles to the equipment and processes downstream. This settling process should thus be designed and operated in an efficient way. Despite the importance of knowing settling characteristics for design and operation of grit chambers, previous grit definitions have been based only on particle size characteristics, and not on settling velocities. Thus, this study presents an evaluation of the performance of two promising settling velocity characterization methods, ViCAs and elutriation, to characterize wastewater particles in view of the design and the optimization of the efficiency of the grit removal unit. © 2019 Water Environment Federation • Practitioner points• Settling characteristics are the governing parameter for grit chamber design. Since grit particles are vastly heterogeneous, it is preferred to measure these characteristics directly rather than to estimate them from particle size (and assumptions of density, form factor, …). • More detailed settling information about grit particles can improve grit chamber design and estimation of removal performance. • Adapted ViCAs and elutriation methods for faster settling particles allow studying the particle settling characteristics in a grit chamber. These methods are simple, fast, and cheap and only require small wastewater samples. • A relationship was found between the influent TSS concentration and the location of the PSVD curve, with higher TSS concentrations corresponding to higher settling velocities. • It was demonstrated that the dynamics of the wastewater characteristics under dry, wet, and snowmelt weather conditions influence grit settling characteristics.

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Section: Resultssupporting

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Characterizing the settleability of grit particles

Plana

Pauléat²,

Gadbois³

et al. 2019

Water Environment Research

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“…, Bachis et al . ). Most of the WWTPs are still operated based on practical experience gained by the operating personnel (Gernaey et al .…”

Section: Introductionmentioning

confidence: 97%

“…However, the extreme complexity of the involved biological processes makes it almost impossible to have a complete understanding of all its intrinsic governing mechanisms and related operations (Gonz alez et al 2016). Modelling and simulation are important tools to study various physical, chemical and biological systems (Stokes et al 2000, Bachis et al 2015. Most of the WWTPs are still operated based on practical experience gained by the operating personnel (Gernaey et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Model calibration and feed‐forward control of the wastewater treatment plant – case study for CLUJ‐Napoca WWTP

Nair

Cristea

Agachi

et al. 2017

Water & Environment J

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Although the activated sludge models for waste water treatment plants (WWTPs) offer comprehensive description of their involved biochemical and physical processes, it is a challenging task to calibrate the model for the operational plant. The article first presents a systematic calibrating procedure applied to the Activated Sludge Model No.1 (ASM 1), showing its potential to be extended to other WWTPs. It particularly addresses cases when comprehensive knowledge on the WWTP influent composition does not exist. An optimisation‐based approach is used for the WWTP model calibration and for finding the partially unknown influent composition. Dynamic model validation shows good match between model predicted values and WWTP measured data. Second, a new feed‐forward control strategy is designed for the WWTP and compared with the conventional nitrate‐nitrite nitrogen and dissolved oxygen control. The evaluation based on the effluent quality index, pumping and aeration energy and the number of effluent violations assessment tools, demonstrates incentives for the proposed control approach.

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“…As such it can serve as important information in different application domains. In primary settling tanks, results from ViCAs experiments can be used as input to primary clarifier models (Bachis et al, 2015) or to study the effect of chemical dosage on the settling velocity distribution in order to improve chemically enhanced primary treatment (CEPT) performance. Furthermore, ViCAs experiments can be applied in the design of combined sewer retention tanks where knowledge of the settling velocity distribution can be used to determine an optimal HRT and corresponding load reduction to the treatment plant.…”

Section: Introductionmentioning

confidence: 99%

Experimental Methods in Wastewater Treatment

Loosdrecht¹,

Nielsen²,

López-Vázquez³

et al. 2016

Water Intelligence Online

138

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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...

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Modelling and characterization of primary settlers in view of whole plant and resource recovery modelling

Cited by 23 publications

References 26 publications

Characterizing the settleability of grit particles

Characterizing the settleability of grit particles

Model calibration and feed‐forward control of the wastewater treatment plant – case study for CLUJ‐Napoca WWTP

Experimental Methods in Wastewater Treatment

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