Electrodialytic Remediation of Soil Polluted with Copper from Wood Preservation Industry

h i g h l i g h t sElectrodialytic remediation could be used to remove Cd from biomass fly ash suspensions. Cd limiting concentrations in the fly ash were met for reuse as fertilizer. pH below 2 in the fly ash suspension was determining the effectiveness for Cd removal. a r t i c l e i n f o a b s t r a c tDue to relatively high concentrations of Cd, biomass combustion fly ashes often fail to meet Danish legislative requirements for recycling as fertilizer. In this study, the potential of using electrodialytic remediation for removal of Cd from four different biomass combustion fly ashes was investigated with the aim of enabling reuse of the ashes. The ashes originated from combustion of straw (two ashes), wood chips, and co-firing of wood pellets and fuel oil, respectively. A series of laboratory scale electrodialytic remediation experiments were conducted with each ash. The initial Cd concentration in the ashes varied between 8.8 mg Cd/kg (co-firing ash) and 64 mg Cd/kg (pre-washed straw ash), and pH varied from 3.7 (co-firing ash) to 13.3 (wood ash). In spite of such large variations between the ashes, the electrodialytic method showed to be sufficiently robust to treat the ashes so the final Cd concentration was below 2.0 mg Cd/kg DM in at least one experiment done with each ash. This was obtained within 2 weeks of remediation and at liquid to solid (L/S) ratios of L/S 16 for the pre-washed straw ash and L/S 8 for the straw, co-firing and wood ash.

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“…The method was first developed for removal of heavy metals from soils [14]. The principle is illustrated in Fig.…”

Section: Electrodialytic Remediationmentioning

confidence: 99%

“…1) as stationary and water saturated [14]. Later it was shown that for treatment of fine-grained materials as fly ashes and harbour sediment it is beneficial to treat a stirred suspension instead [3,15].…”

Section: Electrodialytic Remediationmentioning

confidence: 99%

Electrodialytic removal of Cd from biomass combustion fly ash suspensions

Kirkelund

Damoe

Ottosen

2013

Journal of Hazardous Materials

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“…In connection with remediation of soil, fly ash and wood, anion and cation exchange membranes have been used to separate the material to be remediated and the electrodes, to avoid entering the pH changes into the material and thereby also to optimize the remediation process (Ottosen et al [6]). Due to the special geometry of church vaults and the need to reduce maintenance new electrode units were developed especially for the use of salt extraction from church vaults.…”

Section: The Historical Origin Of the Murals And Their Foundationmentioning

confidence: 99%

Preservation of murals on salt loaded masonry vaults by electromigration

Rörig-Dalgaard¹,

Ottosen²

2007

WIT Transactions on the Built Environment, Vol 95

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Salt induced deterioration of murals in churches has increased within the last decades in Denmark. However, no lasting preservation method has been found. Either murals are repainted by conservators or placed in climate chambers which give the deterioration a break. Ion migration in a solution in an applied electric DC field is termed electromigration and is a well known and accepted transport process. In wet porous clay brick masonry, which most Danish church vaults consist of electro migration is expected to be an efficient transport mechanism for ion extraction out of the vaults. This idea was tested in the present work.Electromigration experiments in bricks with low NaCl concentration (spiked into the brick by soaking) showed that it is possible to clean a brick to its initial ion content new from the factory. An experimental setup which is applicable under real conditions and with ion contents corresponding to heavily polluted church vaults (1.4 weight% chloride) showed significantly decreasing ion contents as a function of time. Experiments are ongoing to reach a harmless ion content which is thought to be a matter of duration and optimization of experimental conditions.Simultaneously with the electromigration process varying extends of acid and base is produced due to electrode reactions. Clarifying experiments showed extreme pH changes and pointed out the need for developments of electrode setups to avoid these changes. New experiments with the developed electrode units reduced the pH changes remarkably, which make the method usable in connection with cultural heritage.On the basis of successful laboratory results electrokinetics for extraction of ions from masonry vaults might be the missing lasting method to extract the damaging salts and thereby preserve the murals.

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“…La remediación electroquímica es una técnica innovadora que puede utilizarse como tratamiento efectivo para la separación de metales contenidos en el estéril de carbón, mediante la aplicación de un campo eléctrico. De la misma manera como los contaminantes metálicos se han eliminado, con buenos resultados, de suelos, cenizas de carbón y sedimentos [4][5][6][7][8][9]. La remediación electrocinética esencialmente involucra la instalación de electrodos y la aplicación de una corriente directa continua, o de un gradiente de potencial a través de éstos, durante cierto tiempo [1].…”

Section: Introductionunclassified

Electrochemical Remediation at Laboratory Scale of the Coal Dump in Paz de Rio (Colombia)

Cuellar¹,

Vázquez²

2009

Port. Electrochim. Acta

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Paz de Rio, municipality of the North of the department of Boyacá (Colombia), has a coal waste dump for the residues of washing of the coal produced by the preparation of this commodity and locates them without any treatment, action that originates the sterilization of the soil. The big volume produced of the waste causes environmental problems and a health risk for the nearby populations because the toxic metals contained, which flow and polluted the waters of the rivers Soapagua and Chicamocha, and decreases the suitable land for the agricultural uses. In consequence, it is necessary to apply a treatment that decreases the negative effects over the water and soil resources of the region. By this reason, it is required a treatment of the waste, such as the electrokinetic remediation, for applying a voltage gradient for a time (Zhou, 2004). The electric current acts as an agent that moves the contaminants to the anode or the cathode, in agreement with their charges and direction of flux (Acar y Alshawabkeh, 1993). This way, the research found the ability of the electrochemical remediation to handle 6 Kg of the waste, with a humidity of 30 %, applying a voltage of 30-40V.Keywords: coal waste, electro-remediation, toxic metals, polarography. IntroducciónPaz de Río es un municipio de Colombia ubicado al noreste del departamento de Boyacá. En éste se encuentra la Planta Lavadora de Carbón Santa Teresa, donde se realizan la limpieza del carbón que se extrae en este municipio y en sectores aledaños como Samacá, Socha, Socotá y Tasco. En la planta se realiza una serie de procesos de separación del carbón de las impurezas que lo acompañan, con generación de una corriente de agua residual cargada de minerales metálicos (magnetita) y partículas finas en suspensión (arcillas del carbón). Se vierte ésta a

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Electrodialytic Remediation of Soil Polluted with Copper from Wood Preservation Industry

Cited by 155 publications

References 8 publications

Electrodialytic removal of Cd from biomass combustion fly ash suspensions

Electrodialytic removal of Cd from biomass combustion fly ash suspensions

Preservation of murals on salt loaded masonry vaults by electromigration

Electrochemical Remediation at Laboratory Scale of the Coal Dump in Paz de Rio (Colombia)

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