Electrokinetic Separation of Heavy Metals from Wastewater Treatment Sludge

Park, Seon-Young; Park, Geun-Yong; Kim, Do-Hyung; Yang, Jung‐Seok; Baek, Kitae

doi:10.1080/01496395.2010.493836

Cited by 20 publications

(4 citation statements)

References 13 publications

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“…Electrokinetic (EK) technology is a technique that employs a low direct current to facilitate the ionic metal transport through porous media [5]. EK technology has been applied to control or remediate various inorganic and organic pollutants in soils and sediments [6][7][8][9][10][11][12][13][14][15][16][17]. A Danish research group reported that heavy metals such as Cu, Zn, Pb, and Cd were removed effectively by electrodialytic experiments in the laboratory from harbor sediments [17].…”

Section: Introductionmentioning

confidence: 99%

Electrokinetic extraction of heavy metals from dredged marine sediment

Kim

Yoo

et al. 2011

Separation and Purification Technology

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108

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Section: Introductionmentioning

confidence: 99%

Electrokinetic extraction of heavy metals from dredged marine sediment

Kim

Yoo

et al. 2011

Separation and Purification Technology

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108

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“…Electrokinetic technology (ET) makes us of electrodes whose current attracts migrating heavy metal ions. To prevent the precipitation of the insoluble metal salts, it is necessary to keep them in a dissolved form, e.g., by using chelating compounds (Park et al 2010 ) or biosurfactants. The effectiveness of heavy metal ions removal using biosurfactants (rhamnolipid, saponin and sophorolipid) resulted in the elimination of 55–74% of heavy metals ions (Tang et al 2018 ).…”

Section: Problem Of Micropollutantsmentioning

confidence: 99%

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Izydorczyk

Mikula

Skrzypczak

et al. 2021

Environ Sci Pollut Res

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This literature review outlines the most important—agricultural and non-agricultural—types of sewage sludge management. The potential of waste sludge protein hydrolysates obtained by chemical sludge conditioning was reported. The discussed areas include acidic and alkaline hydrolysis, lime conditioning, polyelectrolyte dewatering and other supporting techniques such as ultrasounds, microwave or thermal methods. The legislative aspects related to the indication of the development method and admission to various applications based on specified criteria were discussed. Particular attention was devoted to the legally regulated content of toxic elements: cadmium, lead, nickel, mercury, chromium and microelements that may be toxic: copper and zinc. Various methods of extracting valuable proteins from sewage sludge have been proposed: chemical, physical and enzymatic. While developing the process concept, you need to consider extraction efficiency (time, temperature, humidity, pH), drainage efficiency of post-extraction residues and directions of their management. The final process optimization is crucial. Despite the development of assumptions for various technologies, excess sewage sludge remains a big problem for sewage treatment plants. The high costs of enzymatic hydrolysis, thermal hydrolysis and ultrasonic methods and the need for a neutralizing agent in acid solubilization limit the rapid implementation of these processes in industrial practice. Graphical abstract

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“…However, these are only temporary solutions. Recently, electrokinetic (EK) treatment has been used as a method to remediate or control various contaminated media such as soils (Kim et al 2009a(Kim et al , 2009bOttosen et al 2006;Reddy and Chinthamreddy 2004;Reddy et al 2001;Ryu et al 2010;Zhou et al 2004), mine tailings Hansen et al 2005;Kim et al 2002a;Ryu et al 2009), and sludge (Kim et al 2002b;Park et al 2010). The major mechanisms responsible for the removal of contaminants in the EK treatment process are electromigration and electroosmosis (Acar and Alshawabkeh 1993;Acar et al 1995).…”

Section: Introductionmentioning

confidence: 98%

Pilot-scale ex situ electrokinetic restoration of saline greenhouse soil

2011

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Purpose This study was conducted to investigate the feasibility of using an ex situ electrokinetic system for the restoration of saline greenhouse soil. Materials and methods An experiment was conducted in a pilot-scale reactor (1×1×0.25 m) during 14 days. Results and discussion Chloride accumulated in the top layer through pore-water evaporation. There was no removal of the nitrate in the top layer because of the continuous upward transport of nitrate accompanying the evaporation of soil moisture. However, the removal of sulfate was uniform across all the layers. In the case of cations, a significant amount (64.4%) of potassium was removed, and there was no removal of the magnesium in the top layer. The electrokinetic treatment changed the speciation of calcium in the soil, resulting in an increase in the amount of exchangeable calcium. Furthermore, nitrate was transported toward the anode and reduced to nitrogen gas as the result of an electrochemical reaction at the surface of the anode. Sulfate formed a very stable and insoluble precipitate with calcium-calcium sulfate (gypsum). Conclusions Ex situ electrokinetic system removed salts from nitrate and sulfate-accumulated saline soil. However, the overall removal efficiency was not high enough because of relatively short operation time.

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Electrokinetic Separation of Heavy Metals from Wastewater Treatment Sludge

Cited by 20 publications

References 13 publications

Electrokinetic extraction of heavy metals from dredged marine sediment

Electrokinetic extraction of heavy metals from dredged marine sediment

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Pilot-scale ex situ electrokinetic restoration of saline greenhouse soil

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