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Dive into the research topics where Zandra Arwidsson is active.

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Featured researches published by Zandra Arwidsson.


Journal of Hazardous Materials | 2009

Laboratory and pilot scale soil washing of PAH and arsenic from a wood preservation site: Changes in concentration and toxicity

Kristin Elgh-Dalgren; Zandra Arwidsson; Aida Camdzija; Ragnar Sjöberg; Veronica Ribé; Sylvia Waara; Bert Allard; Thomas von Kronhelm; Patrick A.W. van Hees

Soil washing of a soil with a mixture of both polycyclic aromatic hydrocarbons (PAH) and As was evaluated in laboratory and pilot scale, utilizing both single and mixtures of different additives. The highest level of decontamination was achieved with a combination of 0.213 M of the chelating agent MGDA and 3.2 x CMC* of a non-ionic, alkyl glucoside surfactant at pH 12 (Ca(OH)(2)). This combination managed to reach Swedish threshold values within 1 0 min of treatment when performed at elevated temperature (50 degrees C), with initial contaminant concentrations of As=105+/-4 mg/kg and US-EPA PAH(16)=46.0+/-2.3mg/kg. The main mechanisms behind the removal were the pH effect for As and a combination of SOM ionization as a result of high pH and micellar solubilization for PAHs. Implementation of the laboratory results utilizing a pilot scale equipment did not improve the performance, which may be due to the shorter contact time between the washing solution and the particles, or changes in physical characteristics of the leaching solution due to the elevated pressure utilized. The ecotoxicological evaluation, Microtox, demonstrated that all soil washing treatments increased the toxicity of soil leachates, possibly due to increased availability of contaminants and toxicity of soil washing solutions to the test organism.


Journal of Hazardous Materials | 2010

Remediation of heavy metal contaminated soil washing residues with amino polycarboxylic acids

Zandra Arwidsson; Kristin Elgh-Dalgren; Thomas von Kronhelm; Ragnar Sjöberg; Bert Allard; Patrick A.W. van Hees

Removal of Cu, Pb, and Zn by the action of the two biodegradable chelating agents [S,S]-ethylenediaminedisuccinic acid (EDDS) and methylglycinediacetic acid (MGDA), as well as citric acid, was tested. Three soil samples, which had previously been treated by conventional soil washing (water), were utilized in the leaching tests. Experiments were performed in batches (0.3 kg-scale) and with a WTC-mixer system (Water Treatment Construction, 10 kg-scale). EDDS and MGDA were most often equally efficient in removing Cu, Pb, and Zn after 10-60 min. Nonetheless, after 10d, there were occasionally significant differences in extraction efficiencies. Extraction with citric acid was generally less efficient, however equal for Zn (mainly) after 10d. Metal removal was similar in batch and WTC-mixer systems, which indicates that a dynamic mixer system could be used in full-scale. Use of biodegradable amino polycarboxylic acids for metal removal, as a second step after soil washing, would release most remaining metals (Cu, Pb and Zn) from the present soils, however only after long leaching time. Thus, a full-scale procedure, based on enhanced metal leaching by amino polycarboxylic acids from soil of the present kind, would require a pre-leaching step lasting several days in order to be efficient.


Waste Management | 2011

Re-cycling of remediated soil – Evaluation of leaching tests as tools for characterization

Kristin Elgh Dalgren; Anders Düker; Zandra Arwidsson; Thomas von Kronhelm; Patrick A.W. van Hees

In Sweden, leaching tests with deionized water (D.W.) are utilized in risk assessment of materials entering landfills, but implementation of these results to evaluate the risk of spreading of pollutants in the environment is difficult. One problem is that most leaching procedures only consider heavy metals release, whereas organic pollutants are left out. The aim of the present study was to assess the possible pollutant mitigation in four remediated soils, three with heavy metals and one with polycyclic aromatic hydrocarbons (PAH) contamination. The mitigation was evaluated by standardized batch and column leaching tests utilizing three different leaching solutions: D.W., a weak ionic solution (0.001 M CaCl(2)) and an artificially made soil water (ASW). In general, batch leaching tests implied larger contaminant removal than column leaching test, possibly due to the more rough treatment of the soil particles, and guidelines would at times be exceeded by the batch leaching test but not by column leaching tests. Utilization of CaCl(2) was found to release less heavy metal than D.W., whereas the metals mobilized by ASW were removed from solution by the filtration of soil leachates. Low molecular weight PAH was most efficiently mobilized by CaCl(2), while D.W. worked better for high molecular weight PAH. Despite very low initial PAH-concentrations, tap- and groundwater criteria were exceeded by all leaching solutions.


Water Air and Soil Pollution | 2010

Remediation of Metal Contaminated Soil by Organic Metabolites from Fungi I—Production of Organic Acids

Zandra Arwidsson; Emma M. Johansson; Thomas von Kronhelm; Bert Allard; Patrick A.W. van Hees


Water Air and Soil Pollution | 2010

Remediation of Metal-Contaminated Soil by Organic Metabolites from Fungi II-Metal Redistribution

Zandra Arwidsson; Bert Allard


Water Air and Soil Pollution | 2011

Bioremediation of a Soil Industrially Contaminated by Wood Preservatives—Degradation of Polycyclic Aromatic Hydrocarbons and Monitoring of Coupled Arsenic Translocation

Kristin Elgh-Dalgren; Zandra Arwidsson; Veronica Ribé; Sylvia Waara; Thomas von Kronhelm; Patrick A.W. van Hees


Archive | 2011

Recycling of amino polycarboxylic acids in soil washing of heavy metal contaminated soil

Zandra Arwidsson; Bert Allard; Kristin Elgh-Dalgren; Patrick A.W. van Hees


Archive | 2011

Leaching of metals from contamined soil with polyhydroxycarboxylic acids of natural origin

Zandra Arwidsson; Marie Ålund; Bert Allard


25th International Applied Geochemistry Symposium, 22-26 August, 2011, Rovaniemi, Finland | 2011

Metal mobilisation from soils and sediments by hydroxycarboxylic acids of natural origin

Zandra Arwidsson; Marie Ålund; Bert Allard; Stefan Karlsson


12th EuCheMS International Conference on Chemistry and the Environment, Stockholm, Sweden, June 14-17, 2009 | 2009

Leaching of metals from contaminated soil with polyhydroxicarboxylic acids of natural origin

Marie Ålund; Zandra Arwidsson; Bert Allard

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Veronica Ribé

Mälardalen University College

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Sylvia Waara

Mälardalen University College

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Emma Nehrenheim

Mälardalen University College

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