Dynamic grit chamber modelling: dealing with particle settling velocity distributions

Plana, Queralt; Lessard, Paul; Vanrolleghem, Peter

doi:10.2166/wst.2020.108

Cited by 5 publications

(1 citation statement)

References 15 publications

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“…The Overflow Rate (OFR) of a settler has the dimensions of velocity and can be used to analyze the particle size that will be removed in the tank by equating it to the particle's settling velocity using Newton's Law, thus providing the basis for the design of grit separators [8,9]. In this study, the overflow rates were 0.078 m/s for the MTS and 0.366 m/s for the FVS, which translate to the settling velocities of particles with a SES of 95 and 206 μm, respectively.…”

Section: Discussionmentioning

confidence: 99%

Side-by-Side Testing of Grit Separation Units

2024

Int J Water Wastewater Treat

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Two grit removal systems were tested side-by-side for the treatment of wastewater from a combined-sewer system. The two units were operated at constant flows and variable grit loads ranging from 1.2 to 745 Kg/m3 /h that covered the typical range of dry and wet weather conditions experienced at the treatment facility. The average mass grit removal for the multi-tray free vortex unit was 92.6% and it was 85.4% for the forced vortex system. Both units consistently failed to remove particles with sand equivalent sizes, which their respective overflow rates would otherwise predict. This observation can be explained by uneven force distributions over non-spherical grit particles with lumpy grease deposits and variable curvature that effect motion traverse to flow, increase buoyancy and cause particle lift.

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Section: Discussionmentioning

confidence: 99%

Side-by-Side Testing of Grit Separation Units

2024

Int J Water Wastewater Treat

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Recent Advancement and Efficiency Hindering Factors in the Wastewater Treatment Plant: A Review

Awasthi

Moten

2022

Recent Trends in Wastewater Treatment

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Analysis of the Hydrodynamic Characteristics in a Rectangular Clarifier under Earthquake-Induced Sloshing

Aksel¹

2023

Turkish Journal of Civil Engineering

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Wastewater treatment plants, which play a crucial role in protecting the hydrosphere, are earthquake-prone infrastructures with large tanks and sensitive equipment. Damage to the structures in such facilities during seismic activity on the lithosphere can cause environmental pollution and threaten public health. Since the units/tanks in the treatment plants are not of different geometries and sizes, they may exceed the freeboard of the wave height due to the sloshing event. In this study, the sloshing dynamics of a rectangular type of clarifier were investigated. First, numerical parameters, boundaries, and initial conditions were validated using the results of an experimental campaign. Secondly, model conditions were kept constant, and geometry was enlarged (i.e., scaled-up) to investigate the variation of hydrodynamic forces near vulnerable equipment (such as scrapers and weirs) in clarifier. The numerical model was run for characteristics of two different earthquakes (i.e., Chi Chi-1999 and Kocaeli-1999). The results showed that dynamic pressure values near vulnerable equipment increased up to 120 times higher than the operating conditions. The maximum sloshing wave heights were calculated as 1.2 m and 1.45 m for Chi Chi (1999) and Kocaeli (1999) earthquakes, respectively.

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Dynamic grit chamber modelling: dealing with particle settling velocity distributions

Cited by 5 publications

References 15 publications

Side-by-Side Testing of Grit Separation Units

Side-by-Side Testing of Grit Separation Units

Recent Advancement and Efficiency Hindering Factors in the Wastewater Treatment Plant: A Review

Analysis of the Hydrodynamic Characteristics in a Rectangular Clarifier under Earthquake-Induced Sloshing

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