Electrokinetic (EK) treatment is becoming increasingly important in the geotechnical field, especially for treating fine-grained soils. Above all, dredged sediments (slurries) need to be treated in order to be reutilised. Applying an electric potential difference within the soil, three phenomena take place: electrophoresis, electro-osmosis and …Web
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The electrokinetic cell shown in Fig. 3 has been developed to measure the electro-osmotic ... Menu Relative relevance of factors affecting the electrokinetic dewatering of soft clayey soils Sara ...Web
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2.1 Electrokinetic Processes in Soils. Electrokinetics refers to the relationship between electrical potential and the movement of water and charged particles. Under a DC voltage water flows by electroosmosis from the anode (+) to the cathode (−) as long as the voltage gradient is kept constant (Fig. 2.1 ).Web
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The use of electrokinetic geosynthetic (EKG) technology has been shown to be an effective alternative method of treatment which is rapid, inexpensive and has the major advantage of reducing the volume of waste which needs to be stored. ... The method of application of electrokinetic dewatering depends upon the nature of the material to …Web
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During electrokinetic dewatering of kaolinite dispersions, Aziz et al. (Aziz et al., 2006) suggested that the pH gradient could potentially change the particle aggregation state. ... The main characteristics of clay sample obtained from the Four Corners mining plant in central Florida is shown in Table 1. Fig. 3 displays the sample X-ray ...Web
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Electrokinetic dewatering or consolidation is based on the imposition of an electric potential difference inside soil or tailings, through electrodes inserted within their …Web
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Researchers have shown that many factors such as soil content, pH and zeta potential, electrode type, applied electric field, and conductivity of the medium affect electrokinetic processes [34 ... Trials of on-site application of the electrokinetic waste dewatering technique should be started. At the same time, studies should be started in …Web
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The purpose of this study is to assess the feasibility of electroosmosis method using EKG electrode on sludge dewatering and consolidation. Previous studies have shown that EKG (electrokinetic geosynthetics) electrode can be used to replace metal electrode in electroosmosis of soil. Laboratory tests were carried out with …Web
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Electrokinetic dewatering (EKD) is also referred to in the literature as electro-dewatering (EDW) or electro-osmotic dewatering (EOD). Mahmoud et al. ... The dewatering unit, shown in Fig. 5, was designed with two conveyors for clay transport. The conveyor belts encompassed expanded metal mesh electrodes with dimensions of 63.5 …Web
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Several researchers have shown that electrokinetic dewatering of sludge is more efficient than conventional hydraulically driven methods. This involves the application of a dc voltage across the ...Web
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The dewatering and consolidation of MFT for sustainable management is an important task for the mining industry. ... A study on electrokinetic dewatering of oil sands tailings ... It is shown that ...Web
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Researchers have shown the technique to be efficient means of driving off water from the sludge, thus improving strength and reducing volume. This paper …Web
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A series of studies performed by Shang on mine tailings [37, ∗52, ∗53, ∗54] demonstrated combined mechanical and electrokinetic dewatering of various clay materials, mechanistic investigations into the rate of dewatering as a function of …Web
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The energy requirement for this operation was shown to be consistent with previously published results for batch operation. The results provide guidance for the on-going development of a device for fully-continuous electrokinetic dewatering of phosphatic clay suspensions. ... [21]. Electrokinetic dewatering relies on the negative surface …Web
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Conclusions. Electrokinetic dewatering is a useful addition to dewatering with a conventional filter belt press, as shown in full-scale tests on a 1 m wide belt press. The final dry solids content is raised from 17 to 21 and even 24% (m/m) by applying an electric potential difference of 30 V across the sludge bed, resulting in an additional ...Web
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The economic analysis identified operational minima, shown in Table 2, can serve as a design considerations for the development of pilot-scale continuous electrokinetic dewatering processes. As shown in Fig. 10, the total cost at low dry-clay production rates was dominated by the capital cost. As the production rate increased, the …Web
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Electrokinetic geosynthetic (EKG) strengthening of slopes is a multi-component treatment method which includes dewatering by electro-osmosis; reinforcement; drainage and soil modification.Web
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Abstract. Electrochemically assisted dewatering, also called electro-dewatering (EDW), electrokinetic dewatering (EKD), and field-assisted dewatering is a technology widely used in soil engineering. The control of water movement in porous matrices under the application of an electrical field is the basis of the electrochemically …Web
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The main objective of this study is to study the effectiveness of electrokinetic dewatering technique for saturated soil. In this paper, the influence of …Web
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Several researchers have shown that electrokinetic dewatering of sludge is more effective than conventional hydraulically driven methods. Electrokinetic dewatering involves the application of a D.C Voltage across the sludge, driving water under an electrical gradient from positive (anode) electrode to negative (cathode) electrode.Web
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The observation that the electric field controls both the maximum solids content achievable and the time required to reach that value is shown to severely constrain the application of electrokinetic dewatering strategies to an entire clay settling area. The approach, however, may be feasible for implementation as part of a continuous plant …Web
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Treatment of deep deposits by electrokinetic geosynthetics has been shown to be more economic and effective than vacuum preloading (Zhuang, 2015; Zhuang et al., 2014). Recent developments are applying this technique to consolidation of soft highly saline marine margin soils. ... Laboratory trials of the electrokinetic dewatering potential of ...Web
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Different dewatering methods has been investigated including densification by flocculation (Ettoumi et al. 2020), a combination of flocculation and filtration or flotation, electrokinetic (Shang and Lo 1997; Dizon and Orazem 2019) including electrophoresis, dielectrophoresis and electro-osmosis, dewatering and wet oxidation at temperatures ...Web
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the anode while the lower is the cathode through which the water is filtered away as shown in Figure 5. The ... are the two main parameters used to determine whether electrokinetic dewatering is .Web
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potential benefit of electrokinetic dewatering. As shown by. Nicholls and Herbst (1967) and Lockhart (1983 a), electrokinetic de watering is much more ener gy eff icient at. lower voltage gradients.Web
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This paper summarises the results collected from several case studies to understand the influence of some parameters on the efficiency of EK treatment, …Web
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Several researchers have shown that electrokinetic dewatering of sludge is more effective than conventional hydraulically driven methods. Electrokinetic dewatering involves the application of a D.C Voltage across the sludge, driving water under an electrical gradient from positive (anode) electrode to negative (cathode) electrode. However,Web
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The mechanism of electrokinetic dewatering (EKD) exploits the charge of the suspended particles, where the surface charge of the particle yields charge …Web
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Abstract. Electrokinetic (EK) dewatering involves the application of a (direct current) voltage across sewage sludge, driving water under an electrical gradient from the …Web
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As shown in the electrokinetic cell tests, the velocity of electrokinetic sedimentation of the phosphate clay suspensions was dominated by the applied current density. On the other hand, applications of intermittent current at proper intervals improved the efficiency of electrokinetic dewatering significantly. 3.5.Web
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The electrokinetic phenomena work on the assumption that by using a small electrical gradient between the electrodes positioned in the soil to be improved, counterions travel to anode and cathode. ... as …Web
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Electrokinetics (EK) has been applied on dewatering and consolidation of geo-materials, such as contaminated river sediment and soft clays. EK treatment has been successfully applied and shown promising potentials in dewatering of fine tailings in previous research and field applications (e.g. Lockhart 1986; ShangWeb
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Electrokinetic (EK) dewatering of malt extract and orange juice is investigated. ... For the two food products tested, application of EK technology to enable dewatering was shown to be effective under a range of conditions; and achieved net dewatering efficiencies up to 7.4% and 4.9% after 5.5hrs for OJ and 10.7% and 6.3% for …Web
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This electrokinetic process is known as electromigration. To fully understand, ... (as shown in Fig. 7). Thus, transport processes can be in the same or in opposite directions and in addition colloids can be trapped in the soil structure. ... K.R. Reddy, A. Urbanek, A.P. Khodadoust, Electroosmotic dewatering of dredged sediments: …Web
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The main characteristics of sludge are shown in Table 1. The samples were pre-treated by settling to increase the sludge dry solid (DS) content from 3 to 5% and then stored in cold ... Sludge dewatering by electrokinetic technique: effect of processing time and potential gradient. Adv. Environ. Res. (2003) Y.B. Acar et al.Web
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A semi-continuous electrokinetic dewatering process, representing an intermediate step in development of a technology for continuous electrokinetic dewatering of phosphatic clay suspensions, was designed and evaluated through measurement of supernatant turbidity, pH, and changes in solids content. ... As shown in Fig. 13, the …Web
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The principles of electrokinetic dewatering are: (1) electrophoresis, the movement of colloidal particles in a direct current electric field; (2) dielectrophoresis, the …Web
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Tests carried out on a field scale with electrokinetic belt filter press in the dewatering of mining tailing showed promising results, as shown by the works by Fourie et al. (2007a; b) and Lamont-Black et al. . The tailing is introduced into the press, or electrokinetic belt, with the excess water extracted by pressing and electroosmosis.Web
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The United of States of Bureau of Mines conducted research on electrokinetic dewatering of coal mine tailings in the 1960s [14]. The CSIRO of Australia performed research in the 1970s on electrokinetic dewatering of tailings [15]. ... As shown the voltage efficiency increases with the increasing applied voltage gradient (up to 219 V/m), …Web
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