Numerical modeling of baffle location effects on the flow pattern of primary sedimentation tanks

Shahrokhi, Mahdi; Rostami, Fatemeh; Said, Azlin Md; Syafalni,

doi:10.1016/j.apm.2012.09.060

Cited by 29 publications

(17 citation statements)

References 22 publications

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“…A certain amount of work has been undertaken to study the dynamic behavior [10][11][12][13][14][15][16] and hydraulic characteristics of reservoirs and PSTs. In recent years, in order to consider the fluid dynamics of the tank, models based on computational fluid dynamics (CFD) [6,[17][18][19][20][21][22][23][24] have been used to predict flow patterns and suspended solid distributions within sedimentation tanks.…”

Section: Introductionmentioning

confidence: 99%

Model of Suspended Solids Removal in the Primary Sedimentation Tanks for the Treatment of Urban Wastewater

Jover-Smet

Martín-Pascual

Trapote

2017

Water

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Primary settling tanks are used to remove solids at wastewater treatment plants and are considered a fundamental part in their joint operation with the biological and sludge treatment processes. The aim of this study was to obtain a greater understanding of the influence of operational parameters, such as surface overflow rate, hydraulic retention time, and temperature, on the removal efficiency of suspended solids and organic matter by the measurement of chemical oxygen demand and biochemical oxygen demand in the primary sedimentation process. The research was carried out in a semi-technical primary settling tank which was fed with real wastewater from a wastewater treatment plant. The physical process was strictly controlled and without the intervention of chemical additives. Three cycles of operation were tested in relation to the surface overflow rate, in order to check their influence on the different final concentrations. The results obtained show that the elimination efficiency can be increased by 11% for SS and 9% for chemical oxygen demand and biochemical oxygen demand, for variations in the surface overflow rate of around ±0.6 m 3 /m 2 •h and variations in hydraulic retention time of around ±2 h. The results also show that current design criteria are quite conservative. An empirical mathematical model was developed in this paper relating SS removal efficiency to q, influent SS concentration, and sewage temperature.

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Section: Introductionmentioning

confidence: 99%

Model of Suspended Solids Removal in the Primary Sedimentation Tanks for the Treatment of Urban Wastewater

Jover-Smet

Martín-Pascual

Trapote

2017

Water

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“…The flow patterns are considerably influenced by the inlet design [7]. A uniform flow field is necessary to the efficient performance of a sedimentation tank [10]. The hydrodynamic processes in SST depend on the inner density currents as well [11].…”

Section: Discussion and Resultsmentioning

confidence: 99%

Measurement of flow velocity in different secondary settling tanks for analysis of the flow

2017

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Settling tanks are essential parts of wastewater treatment process and their correct design is therefore crucial for its operation. Modeling of flow in these tanks is difficult, therefore it is necessary to find right tool to perform as precise work as possible. In this article flow velocity measurement in two different secondary settling tanks in Slovakia is presented. Rectangular settling tank in Dolný Kubín and radial settling tank with horizontal flow in Nižná nad Oravou were chosen for this purpose. Data gained from these measurement events will be used for building a model and followed by simulation. Additional data from operation of wastewater treatment plants are also used during the work.

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“…Biswal and Bhattacharyya [6] considered the dynamic interaction of liquid-structure-baffle system by using the finite element method and studied the influences of baffle size and position on the liquid sloshing and structural response. Shahrokhi et al [7] studied the influences of baffle position on the liquid flow pattern of liquid-storage structure by using computational fluid dynamics (CFD). Wang et al [8] got the potential functions of each subdomain liquid by using the separation variable method and superposition principle and studied the fluid-solid coupling characteristics of the liquidstorage structure with elastic baffle.…”

Section: Introductionmentioning

confidence: 99%

Study of Baffle Boundary and System Parameters on Liquid-Solid Coupling Vibration of Rectangular Liquid-Storage Structure

Wei¹,

Cheng²,

Shi³

et al. 2016

Shock and Vibration

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In order to study the vibration problem of liquid-solid coupling of rectangular liquid-storage structure with horizontal elastic baffle, ignoring the influence of surface gravity wave, two different velocity potential functions corresponding to the liquid above and below the elastic baffle are assumed; based on the theory of mathematical equation and energy method, the formulas of basic frequency of liquid-solid coupling vibration system are derived, the baffle joined to the tank wall with 3 kinds of boundary conditions, namely, four edges simply supported, two opposite edges clamped and two opposite edges simply supported, and four edges clamped; the influence rules of baffle length-width ratio, the ratio of baffle height to liquid level, baffle elastic modulus, baffle density, baffle thickness, and liquid density on the coupling vibration performance are studied. The results show that the frequency of the clamped boundary is minimum; the influences of baffle length-width ratio and relative height on the basic frequency are much greater than that of the other system parameters; the relation between baffle length-width ratio and the frequency is exponential, while baffle relative height has a parabola relation with the frequency; the larger the baffle length-width ratio, the closer the baffle to the liquid level; the coupling frequency will be reduced more obviously.

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Numerical modeling of baffle location effects on the flow pattern of primary sedimentation tanks

Cited by 29 publications

References 22 publications

Model of Suspended Solids Removal in the Primary Sedimentation Tanks for the Treatment of Urban Wastewater

Model of Suspended Solids Removal in the Primary Sedimentation Tanks for the Treatment of Urban Wastewater

Measurement of flow velocity in different secondary settling tanks for analysis of the flow

Study of Baffle Boundary and System Parameters on Liquid-Solid Coupling Vibration of Rectangular Liquid-Storage Structure

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