Electro-dewatering of dredged sediments by combined effects of mechanical and electrical processes: Influence of operating conditions

Ammami, Mohamed Tahar; Song, Yue; Benamar, Ahmed; Portet‐Koltalo, Florence; Wang, H.

doi:10.1016/j.electacta.2020.136462

Cited by 19 publications

(3 citation statements)

References 32 publications

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“…Several factors, such as voltage, pressure, temperature, electrode materials, and dewatering time, play a crucial role in the efficiency of combined mechanical and electrokinetic dewatering processes [180]. Ensuring a sufficiently high zeta potential of the sludge particles is also crucial for the effectiveness of electrodewatering.…”

Section: Electrical Mechanical Dewateringmentioning

confidence: 99%

Towards a Circular Economy in the Mining Industry: Possible Solutions for Water Recovery through Advanced Mineral Tailings Dewatering

Hamraoui,

Bergani,

Ettoumi

et al. 2024

Minerals

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The mining industry is confronted with substantial challenges in achieving environmental sustainability, particularly regarding water usage, waste management, and dam safety. The increasing global demand for minerals has led to increased mining activities, resulting in significant environmental consequences. By 2025, an estimated 19 billion tons of solid tailings are projected to accumulate worldwide, exacerbating concerns over their management. Tailings storage facilities represent the largest water sinks within mining operations. The mismanagement of water content in tailings can compromise their stability, leading to potential dam failures and environmental catastrophes. In response to these pressing challenges, the mining industry is increasingly turning to innovative solutions such as tailings dewatering and water reuse/recycling strategies to promote sustainable development. This review paper aims to (I) redefine the role of mine tailings and explore their physical, chemical, and mineralogical characteristics; (II) discuss environmental concerns associated with conventional disposal methods; (III) explore recent advancements in dewatering techniques, assessing their potential for water recovery, technical and economic constraints, and sustainability considerations; (IV) and present challenges encountered in water treatment and recycling within the mining industry, highlighting areas for future research and potential obstacles in maximizing the value of mine tailings while minimizing their environmental impact.

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Section: Electrical Mechanical Dewateringmentioning

confidence: 99%

Towards a Circular Economy in the Mining Industry: Possible Solutions for Water Recovery through Advanced Mineral Tailings Dewatering

Hamraoui,

Bergani,

Ettoumi

et al. 2024

Minerals

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“…When electric potential is applied via electrodes integrated into the porous medium, it induces various complex mechanisms, such as electrolysis, electromigration, electro-osmosis, and electrophoresis [4]. The voltage gradient generates the electro-osmotic flow of water [5,6], and solubilized neutral pollutants can be also transported with the pore fluid [7]. Enhanced EKR is highly dependent on the type of processing solution used.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electroremediation of Metals from Dredged Marine Sediment under Periodic Voltage Using EDDS and Citric Acid

Ammami

Benamar

Portet‐Koltalo

2022

JMSE

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The electrokinetic remediation (EKR) method has been extensively considered for the removal of inorganic pollutants from contaminated dredged sediment. In addition, the use of chelating agents as electrolyte solutions has been beneficial in increasing the mobility of metals. This study investigated the metals’ (Cd, Cr, Cu, Pb, and Zn) mobilities by assessing the effect of two environmentally friendly chelating agents, ethylenediaminedisuccinic acid (EDDS) and citric acid (CA), in enhancing the EKR efficiency under a periodic voltage gradient. The results showed that, for the same concentration (0.1 mol L−1), CA is more suitable for enhancing the removal of Cr (67.83%), Cu (59.77%), and Pb (32.05%) by chelating and desorbing them from the sediment matrix and concentrating them in the electrode compartments. EDDS provided efficiency to improve the Cd extraction percentage (45.87%), whereas CA and EDDS had comparable improvement removal impacts on Zn EKR (39.32% and 41.37%, respectively). From the comparison with previous results obtained with a continuous voltage, applying a periodic voltage gradient associated with a low concentration of chelating agents led to a promising result.

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“…Electro-dewatering (EDW) is performed by exposure to an electric field, which induces an electrokinetic transport of the liquid phase and thus enhances the efficiency of dewatering (Mahmoud et al 2010;Ammami et al 2020). The EDW comprises the stages of a filter cake formation and consolidation, assisted by four electrical field inducedphenomena: electrophoresis, electroosmosis, electrolysis, and ohmic heating (Weber and Stahl 2003;Mahmoud et al 2010;Loginov et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Assessment of non-pressurized electro dewatering of waste activated sludge with graphite electrodes

Pakdil

Balaban

2022

BioRes

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Changes of physical and chemical characteristics of sludge were investigated with respect to the pH, process time, and applied voltage by means of the electric field treatments. A model reactor with the desired speed was used to generate an electric field to separate water from the sludge without applying pressure. All electrodes mounted on the reactor were produced from graphite. Two different distances between anode and cathode (2.3 cm and 4.3 cm) were used to examine the effects on dewatering capacity of sludge. Differentiations of dependent variables inferred from the experimental processes were also surveyed by Box-Behnken experimental design. The water in the sludge was separated effectively when the samples were exposed to an electric field. The total solid increased from 1.07% to 6.60% at pH 6.5 when sludge was exposed to 25 V for 60 min. Furthermore, the optimum distance between electrodes was 2.3 cm for dewatering of sludge samples, where the capillary suction time of influent sludge was observed to decrease by approximately 85.5% at raw sludge pH. Similarly, the viscosity parameters decreased by approximately 99%. There was an increase in the soluble chemical oxygen demand, PO4-P, and NH4-N concentrations of water discharged from the model reactor.

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Electro-dewatering of dredged sediments by combined effects of mechanical and electrical processes: Influence of operating conditions

Cited by 19 publications

References 32 publications

Towards a Circular Economy in the Mining Industry: Possible Solutions for Water Recovery through Advanced Mineral Tailings Dewatering

Towards a Circular Economy in the Mining Industry: Possible Solutions for Water Recovery through Advanced Mineral Tailings Dewatering

Enhanced Electroremediation of Metals from Dredged Marine Sediment under Periodic Voltage Using EDDS and Citric Acid

Assessment of non-pressurized electro dewatering of waste activated sludge with graphite electrodes

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