On‐farm remediation and fertility enhancement of cadmium‐contaminated silt loam by electrokinetic treatment process in Taiwan

Chang, Phei‐Lang; Tan, Yih–Chi; Wang, I-Sen

doi:10.1002/ird.348

Cited by 5 publications

(1 citation statement)

References 19 publications

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“…It is also reported that sodium citrate can be a stronger ligand former than ammonia (Ortuño-López et al 2004). Surfactants have proved successful in removing both inorganic and organic contaminants as observed in several studies (Chang et al 2008;Reddy et al 2010). In the present study, non-ionic surfactant, Tween-20 is also used as a flushing agent.…”

Section: Introductionmentioning

confidence: 92%

Electrokinetic removal of mixed heavy metals from a contaminated low permeable soil by surfactant and chelants

2014

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This paper presents the experimental findings of electrokinetic (EK) studies conducted to remove cadmium (Cd ?? ) and copper (Cu ?? ) present together as contaminants in clayey soil. Competitive sorption between cadmium and copper has been studied, which provides an insight into selection of Cd ?? and Cu ?? concentrations for maximum contamination of soil in the EK study. To explore the effect of pH on the desorption of both Cd ?? and Cu ?? and to compare the efficacy of different agents in enhancing the removal of these ions during the EK remediation process, the desorption studies have also been conducted using ammonium citrate (1 M), sodium citrate (1 M) and non-ionic surfactant Tween-20 (0.2 % v/v) at pH 2, pH 7, and pH 12. It was found that maximal sorption capacity of the soil for Cd ?? and Cu ?? was 8.34 and 12.1 mg g -1 , respectively. The desorption of both Cd ?? and Cu ?? influenced by pH for all desorbing agents is considered in the study. Overall desorption values for both Cd ?? and Cu ?? have been observed to be higher when ammonium citrate (1 M) was used as desorbing agent in the study. The results indicate the possibility of competition of complexation of Cd ?? and Cu ?? leading to desorption mechanism in the presence of desorbing agents. The EK tests on the Cd ?? and Cu ?? contaminated soil are carried out at a voltage of 35 V (1.0 V/cm) DC for 5 days. Sequential extraction experiments were conducted to determine fractionation of Cd ?? and Cu ?? in the EKtreated soil using deionized water at pH values of 2, 7 and 12. It is observed that current, electroosmotic flow and mobilization of Cd ?? and Cu ?? depend on pH, zeta potential (1) and specific conductance. Removal of these heavy metals was observed to be higher when ammonium citrate was used both for saturation as well as flushing solution during EK process.

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Section: Introductionmentioning

confidence: 92%

Electrokinetic removal of mixed heavy metals from a contaminated low permeable soil by surfactant and chelants

2014

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Elektrokinetische Bodensanierung

Weigand

2004

Bodengefährdende Stoffe: Bewertung ‐ Stoffdaten ‐ Ökotoxikologie ‐ Sanierung

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Seit Beginn der 1990er‐Jahre gilt die elektrokinetische Bodenbehandlung als Erfolg versprechendes und kostengünstiges Verfahren für die in‐situ‐Sanierung kontaminierter Böden. Hinzu kamen v. a. in jüngerer Zeit Ansätze zur Rückgewinnung von Wertstoffen aus Abfällen, wie Aschen, Schlämmen und ähnlichen Materialien. Als wesentlicher Vorteil gegenüber konventionellen Verfahren wird neben der vergleichsweise schonenden Eingriffsweise die vielseitige Anwendbarkeit in fein‐körnigen porösen Medien gesehen. Die Grundlagen (Elektrodenmaterialien, Stoffumsatz, Elektroosmose) der Methode werden dargestellt, sowie einzelne Anwendungen auf der Feldebene beschrieben.

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Electrokinetic Remediation Technique: An Integrated Approach to Finding New Strategies for Restoration of Saline Soil and to Control Seawater Intrusion

2014

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Many applications of electrokinetic remediation have focused on the removal of heavy metals. However, the application of electrokinetic technology in salt removal from contaminated soils and groundwater has not been extensively explored. Given the current global challenge and the impact of soil and groundwater salinity, it is tempting to suggest that the research community should apply this technology to generate in‐depth knowledge for determining the feasibility and efficiency of electrokinetic remediation in salt removal, particularly in addressing seawater intrusion in coastal aquifers, which is creating growing challenges in the freshwater supply, mainly in coastal and arid regions, in view of growing populations, economic and industrial growth, and climate change. This Review shows that there is a need to begin formulating a knowledge base about categories of materials, efficiencies, and limitations. Furthermore, the viability of this technology in the real field suggests a need to gain more insight into electrokinetic applications in this area. The versatility of electrokinetic remediation in different settings is demonstrated in this Review, as is its capability to address diverse remediation challenges. The available literature is critically assessed; novel and improved electrokinetic remediation and the important trends in this field are outlined. The Review aims to summarize the evolution and current status of electrokinetic remediation research with a view of starting a debate around the possibility of applying it as a pretreatment mechanism to control seawater intrusion.

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On‐farm remediation and fertility enhancement of cadmium‐contaminated silt loam by electrokinetic treatment process in Taiwan

Cited by 5 publications

References 19 publications

Electrokinetic removal of mixed heavy metals from a contaminated low permeable soil by surfactant and chelants

Electrokinetic removal of mixed heavy metals from a contaminated low permeable soil by surfactant and chelants

Elektrokinetische Bodensanierung

Electrokinetic Remediation Technique: An Integrated Approach to Finding New Strategies for Restoration of Saline Soil and to Control Seawater Intrusion

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