Advances and challenges of electrokinetic dewatering of
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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Advances and Challenges of Electrokinetic Dewatering of
The development of electrokinetic dewatering technologies for clay and soil materials has steadily advanced for over 100 years. A review of the origins, important contributions, and recent work on ...Web
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Relative relevance of factors affecting the electrokinetic dewatering
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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Electrokinetic geosynthetics: from research to hype to practice
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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Electrokinetic dewatering of mine tailings from …
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 geosynthetic dewatering of nuclear contaminated …
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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Fundamental of Electrokinetic Processes | SpringerLink
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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DEWATERING SLUDGE USING ELECTROKINETIC …
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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Migration of ions and organic matter during electro-dewatering of
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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Electrokinetic dewatering of mine tailing: influence of
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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The Role of pH, Electrodes, Surfactants, and Electrolytes in
The Fundamental Theory of the Electrokinetic Phenomenon. As shown in Figure 1, the electrokinetic phenomenon is made up of five fundamental processes: electrolysis ... Yang et al. reported that an increase in voltage from 10 V to 20 V led to an increase in the dewatering of sludge, but a further increase to 30 V did not have any …Web
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Microstructure of clay fabric in electrokinetic dewatering of
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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Soil Structure Influence on Electrokinetic Dewatering Process
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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Treatment of sewage sludge using electrokinetic geosynthetics
Typically electroosmotic dewatering of clay soils is of the order of 1–4 orders of magnitude faster than hydraulic dewatering, with a typical value of electro-osmotic permeability (k e) for a clay soil being 10 −5 cm 2 /V s, as opposed to hydraulic permeability which ranges from 10 −9 to 10 −5 m/s for silts and clays.Actual values of k e and k h for a …Web
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Electrical field: A historical review of its application and
During the electrokinetic treatment, the concentrations in the system are changing and thus the conductivity changes also. ... between the amount of water removed by pressure only dewatering and the amount of water removed by the electro-dewatering process. As shown in Fig. 8, it was found that high voltage/or electric field resulted in the ...Web
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Critical review on the efficacy of electrokinetic techniques in
Dewatering. Electrokinetic remediation treatment can be used for dewatering, especially in low-permeable soils such as clayey soils where conventional techniques are not found to be effective. ... in removing a high volume of water and the variation of cumulative water volume observed before and during the electrokinetic …Web
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Effect of Various Parameters on Electrokinetic Dewatering of …
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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Impacts of operating conditions on efficiency of
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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Electrofiltration
The energy consumption of electrokinetic dewatering is typically an order of magnitude lower than for thermal dewatering. Values are quoted in the range of 0.06 kWh dm −3 to 0.18 kWh dm −3 dewatered feed for applied voltages to 10 to 30 V. This compares with approximately 2 kWh dm −3 for dewatering by evaporation. The application of ...Web
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(PDF) Review of the potential role of electrokinetics technology in
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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A Study on Electrokinetic Dewatering of Saturated Soil
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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Electroosmotic Dewatering of Iron Ore Tailings: A Laboratory
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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Mathematical model and optimization of continuous electro …
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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Efficient continuous electrokinetic dewatering of phosphatic clay
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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Electrokinetic sedimentation of mature oil sand mine tailings
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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Full scale electrokinetic dewatering of waste sludge
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 …Web
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Electrochemically Assisted Dewatering | SpringerLink
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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Relative relevance of factors affecting the electrokinetic …
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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Study on Electroosmotic Consolidation of Sludge Using EKG
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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Efficient continuous electrokinetic dewatering of phosphatic clay
Two prototypes are developed for continuous electrokinetic dewatering of phosphatic clay suspensions. A two-stage design comprised an electrophoretic thickening unit followed by a unit that used electro-osmosis to complete the dewatering. ... [16], observed in scanning electron microscope images of phosphatic clay, such as is shown …Web
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