Limit of stokesian settling concentration characterizes sludge settling velocity

Mancell-Egala, William A.S.K.; Kinnear, David J.; Jones, Kimberly L.; Clippeleir, Haydée De; Takács, Imre; Murthy, Sudhir

doi:10.1016/j.watres.2015.12.007

Cited by 20 publications

(16 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latter correlated well with the ISV values of these activated sludge types. LOSS was shown to be a more accurate tool when compared to ISV and sSVI 30 when characterizing hindered settling rates (Mancell-Egala, 2016). The seed had the best settling characteristics with superior sSVI 30 , ISV, and LOSS when compared to the other 5 sludge types.…”

Section: Resultsmentioning

confidence: 94%

“…TOF and LOSS measurements take into consideration the solids concentration, and measure the transitional concentration. Transitional concentrations were first used successfully as a hindered settling metric and have proven to be more accurate than ISV (Mancell-Egala et al, 2016). By accounting for the differences in stokesian and non-stokesian dynamics, hindered settling measurements were less skewed.…”

Section: Resultsmentioning

confidence: 99%

“…Both sSVI 30 tests and Total Suspended Solids (TSS) determination followed protocols listed in standard methods (APHA et al, 2005). The Limit of Stokesian Settling (LOSS) methodology followed the protocol described in Mancell-Egala et al, (2016). LOSS characterizes hindered settling velocity by identifying the transitional solids concentration whereby flocculant (stokesian) settling transitions to hindered (non-stokesian) settling).…”

Section: Methodsmentioning

confidence: 99%

“…In reality, the effluent solids can vary over a range of solids concentrations due to changes in floc characteristics and operation of the activated sludge system. In particular, there are situations where the mixed liquor fed to the clarifier does not form a blanket due to either the characteristics of the solids or a feed concentration below that needed to form a blanket and clarifier performance is dominated by stokesian settling behavior (Mancell-Egala et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Novel Stokesian Metrics that Quantify Collision Efficiency, Floc Strength, and Discrete Settling Behavior

Mancell-Egala

Clippeleir

et al. 2017

Water Environment Research

Self Cite

View full text Add to dashboard Cite

Novel parameters were developed to predict the effluent quality and settling behavior in clarifiers that cannot conventionally be achieved using either the conventional flux theory or overflow rates. Simple batch experiments based on the critical settling velocity (CSV) selection were used as the basis for the development of three novel parameters: intrinsic settling classes (ISC), threshold of flocculation/flocculation limitation (TOF/α), and floc strength. ISC was proven to accurately (±2%) determine the granule fraction and discrete particle distribution. TOF quantified the minimum solids concentration needed to form large flocs and was directly linked to collision efficiency. In hybrid systems, an exponential fitting on a CSV matrix was proposed to quantify the collision efficiency of flocs (α). Shear studies were conducted to quantify floc strength. The methods were applied to a wide spectrum of sludge types to show the broad applicability and sensitivity of the novel methods.

show abstract

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel Stokesian Metrics that Quantify Collision Efficiency, Floc Strength, and Discrete Settling Behavior

Mancell-Egala

Clippeleir

et al. 2017

Water Environment Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…As can be seen from Figure 6.1, this threshold concentration depends on the flocculation state of the sludge. For secondary sludge the transition typically occurs at concentrations of 600 -700 mg TSS L -1 whereas for granular sludge the threshold concentration can go up to 1,600-5,500 mg TSS L -1 (depending on the granulation state) (Mancell-Egala et al, 2016). Above this threshold, each particle is hindered by the other particles and the inter-particle forces are sufficiently strong to drag each particle along at the same velocity, irrespective of size and density.…”

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

Highly Permeable Bucky Paper for the Gas Diffusion Layer of Fuel Cell Prepared by a Whole‐Process Solid Template Method

Wen

Ning

et al. 2023

Energy Tech

View full text Add to dashboard Cite

Due to the control of porosity and pore size on mass transfer, the structure of the gas diffusion layer (GDL) has a critical impact on the performance of fuel cells. The bucky paper has high conductivity and abundant pores, which has potential to be used as GDL in fuel cells. Herein, a whole‐process solid template method is used to prepare the bucky paper with microcrystalline cellulose (MCC), whose porosity and pore size can be regulated quantitatively. The bucky paper with MCC as a pore‐forming agent has more larger pores, and these pores are mostly connected, which meet the needs of fuel cell application. The result of gas flux shows that the permeability of the bucky paper increases from the initial 12 to 240 mL min−1 kPa−1 cm−2 with MCC. The pore structure of bucky paper are significantly improved, so that the bucky paper with MCC leads to a higher fuel cell power density. Furthermore, the impedance result presents that with the addition of MCC, the mass transfer resistance of the fuel cells decreases significantly. It is fully supported in these results that MCC can modify the pores of the bucky paper and applied in proton exchange membrane fuel cells well.

show abstract

Limit of stokesian settling concentration characterizes sludge settling velocity

Cited by 20 publications

References 15 publications

Novel Stokesian Metrics that Quantify Collision Efficiency, Floc Strength, and Discrete Settling Behavior

Novel Stokesian Metrics that Quantify Collision Efficiency, Floc Strength, and Discrete Settling Behavior

Experimental Methods in Wastewater Treatment

Highly Permeable Bucky Paper for the Gas Diffusion Layer of Fuel Cell Prepared by a Whole‐Process Solid Template Method

Contact Info

Product

Resources

About