Potential of using Hydrocyclone and Hydrocyclone equipped with Grit pot as a pre-treatment in run-off water treatment

Puprasert, Chaiyaporn; Hébrard, Gilles; Lopez, L.B.; Aurelle, Y.

doi:10.1016/s0255-2701(02)00154-x

Cited by 25 publications

(14 citation statements)

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“…Oil-water emulsions can hardly be treated, neither can particles which are covered by an oil layer and which are neutrally buoyant. [12,[14][15][16][17][18] Operational variables for the hydrocyclone like pressure drop and percentage of flow in the over flow (oil outlet) have an effect on separation efficiency. Separation of oil A MULTIVARIATE ANALYSIS OF INDIGENOUS CRUDE OIL COMPONENTS droplets is also affected by feed stream quality parameters in the inlet to the hydrocyclone (density difference between oil and water, viscosity of oil and water, oil droplet size distribution, and oil concentration).…”

Section: Introductionmentioning

confidence: 99%

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A Multivariate Analysis on the Influence of Indigenous Crude Oil Components on the Quality of Produced Water. Comparison Between Bench and Rig Scale Experiments

Silset

Flåten²,

Helness

et al. 2010

Journal of Dispersion Science and Technology

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A matrix of 30 crude oils have been analyzed to investigate if there is any correlation between the physiochemical properties of the crude oils and the quality of the produced water. As an approach to study produced water quality, oil. and brine water (3.5 wt%) have been mixed together, and transmission profiles from the separation process have been investigated by means of Turbiscan LAb. The Turbiscan LAb enables the study of stability of colloidal dispersions without any dilution or modification of the sample. The oil-in-water emulsions (30:70) were made by mixing oil and water at low speed to be sure that they separate within a short period of time. Drop size distributions were investigated for all crude oil emulsions by using a Coulter Counter (COULTER Multisizer II). The correlations between transmission profiles and crude oil characteristics were made by using principal component analysis (PCA), a method that helps visualize the most important information contained in a data set and find combinations of variables that describe major trends. A Vortoil K-liner hydrocyclone connected to a mixing rig has been used to separate oil and water in larger scale experiments. The objective with these experiments was to compare the results with separation experiments done at bench scale. Six crude oils have been investigated at the separation rig, and both droplet size distribution and dispersed oil concentration have been performed. The main conclusions from this work are that Turbiscan LAb is a suitable technique to study the separation of oil-in-water with good reproducibility. The results from the multivariate data analysis show that the crude oils group according to if they are light or heavy and according to if they get high or low transmission. From the larger scale experiments it has been shown that the droplet sizes, oil/water density differential, and viscosity have a significant impact on separation efficiency.

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Section: Introductionmentioning

confidence: 99%

“…In real situations, the droplet sizes cannot be controlled directly but measures can be taken to increase the droplet sizes, which is an advantage as larger droplets lead to higher separation efficiency. [16,18] …”

Section: Introductionmentioning

confidence: 99%

A Multivariate Analysis on the Influence of Indigenous Crude Oil Components on the Quality of Produced Water. Comparison Between Bench and Rig Scale Experiments

Silset

Flåten²,

Helness

et al. 2010

Journal of Dispersion Science and Technology

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“…In spite of the differences of design and application, the main intent of these technologies separating settleable solids from the storm water by a swirling flow field was similar (Field & O'Connor 1996;Lee et al 2006). Effectiveness of HDS is highly dependent on their geometrical characteristics such as feed inlet geometry (Tyack & Fenner 1999;Puprasert et al 2004;Drumm & Bart 2006). In recent years, only few research groups have focused on the simulation of flow field and particle tracking within HDS using computational fluid dynamics (CFD) while these technologies have become increasingly applied (Harwood 2002;Chu & Yu 2008).…”

Section: Introductionmentioning

confidence: 99%

CFD modelling of flow field and particle tracking in a hydrodynamic stormwater separator

Lee

Bang

Choi

et al. 2010

Water Science and Technology

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The best management practices (BMPs) for control of urban stormwater pollution are evaluated to remove solid particles containing various pollutants. Currently, most storm runoff treatment devices using primary pollutant removal mechanism are applied to storm water since most pollutants in runoff are associated with the solid particulates. A hydrodynamic separator is a storm water treatment device using centrifugal motion which separates solids pollution from runoff. In this study, the velocity flow field and particle tracking of hydrodynamic separator were investigated using anthracite as a computational fluid dynamics (CFD) model particle. The Fluent 6.3.26 CFD program was used to predict the solid particles removal efficiency for various parameters such as particle size, surface loading rate, and the ratio of underflow to overflow. The velocity flow field in a hydrodynamic stormwater separator (HDS) has been simulated using CFD RNG κ-ε model. Modeling results for the removal efficiency of HDS were similar with the results obtained from experimental measurements of laboratory scale HDS. These results showed that the simulated velocity field was useful to interpret the behavior of flow in the hydrodynamic separator. The results obtained from particle tracking can be applied to predict the separation efficiency.

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“…This diffusion ''force'' is generated by the interaction of particles as they undergo random displacements in a shear flow. Since the rotational flow in the primary vortex (outer region in a hydrocyclone) can be analogized to a free vortex, [12] the velocity profile and shear rate in the h-direction can be expressed, respectively, as:…”

Section: Centrifugal Effectmentioning

confidence: 99%

Mechanism of Particle Separation in Small Hydrocyclone

2008

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The mechanism of particle separation in a small hydrocyclone is analyzed in this study. The separation efficiency of particles is affected by two major effects, the centrifugal and underflow effects. The fundamentals of these effects on the selectivity curve are derived from the theories of hydrodynamics. Three JIS particulate samples are separated in a 10-mm hydrocyclone. The proposed mechanism can be demonstrated by the available data. An increase in split ratio leads to an increase in the separation efficiency only for fine particles; consequently, a decrease in the separation sharpness results in a remarkable fishhook phenomenon. When the feed rate is increased by increasing the pressure drop through the hydrocyclone, the entire partial separation efficiency will be improved, but the separation sharpness and fishhook depth have no substantial varieties. The proposed mechanism can be used for explaining these phenomena, for the selection of optimum operating conditions, and for the hydrocyclone design. INTRODUCTIONA hydrocyclone is an economic centrifugal solid-liquid separator or particle classifier. Since it has many advantages, such as simple design, low capital and maintenance costs, energy savings, low pollutions, high capacity, continuous operation, etc., hydrocyclones have been increasingly used in many mineral and industrial processes. However, to extend the applications of hydrocyclones, there are still many limitations, especially for the cut diameter and the sharpness of separation efficiency. A so-called fishhook phenomenon on separation efficiency frequently occurs when fine particles are separated in a small hydrocyclone. This phenomenon should be well understood in order to improve the separation efficiency of small hydrocyclones.Similar to those operations in air cyclones, the centrifugal effect is one of the most important factors for particle separation. The centrifugal force in a hydrocyclone is

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Potential of using Hydrocyclone and Hydrocyclone equipped with Grit pot as a pre-treatment in run-off water treatment

Cited by 25 publications

References 1 publication

A Multivariate Analysis on the Influence of Indigenous Crude Oil Components on the Quality of Produced Water. Comparison Between Bench and Rig Scale Experiments

A Multivariate Analysis on the Influence of Indigenous Crude Oil Components on the Quality of Produced Water. Comparison Between Bench and Rig Scale Experiments

CFD modelling of flow field and particle tracking in a hydrodynamic stormwater separator

Mechanism of Particle Separation in Small Hydrocyclone

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