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

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

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

Electrokinetic dewatering of kimberlite slime under constant direct currents of 0. 5 to 2 A and dewatering under constant applied potentials of 16. 5 to 46. 5 V are considered.Web

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

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

Abstract. Electrokinetic (EK) dewatering involves the application of a (direct current) voltage across sewage sludge, driving water under an electrical gradient from the …Web

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

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

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

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

The principles of electrokinetic dewatering are: (1) electrophoresis, the movement of colloidal particles in a direct current electric field; (2) dielectrophoresis, the …Web

Electrokinetic geosynthetic (EKG) strengthening of slopes is a multi-component treatment method which includes dewatering by electro-osmosis; reinforcement; drainage and soil modification.Web

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

This paper summarises the results collected from several case studies to understand the influence of some parameters on the efficiency of EK treatment, …Web

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

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

Electrokinetic dewatering or consolidation is based on the imposition of an electric potential difference inside soil or tailings, through electrodes inserted within their …Web

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

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

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

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

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

The mechanism of electrokinetic dewatering (EKD) exploits the charge of the suspended particles, where the surface charge of the particle yields charge …Web

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

A series of bench-scale experiments were conducted in the electro-kinetic dewatering cell shown in Fig. 1a. Dewatering efficiency. The effect of EKD on dewatering efficiency was presented in Table 2. In the context of this paper, dewatering efficiency refers to the ratio of the filtrate weight to the initial weight of water in the sludge, i.e ...Web

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

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