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Title (Primary) Mobilization of arsenic and heavy metals from contaminated sediments by changing the environmental conditions
Author Seidel, H.; Mattusch, J.; Wennrich, R.; Morgenstern, P.; Ondruschka, J.;
Journal Acta Biotechnologica
Year 2002
Department UBT; ANA; SANA;
Volume 22
Issue 1-2
Language englisch;
Abstract The solubility of arsenic (As) and heavy metals (Me) from two sediments with differing chemical characteristics and degrees of contamination was quantified by suspension leaching under both aerobic and anoxic conditions. Elemental sulphur (S°) was added as a substrate for the indigenous Thiobacillus spp. The objective of this study was to examine the effects of measures, which attempted to stimulateor to prevent the mobilization of the pollutants in the source material. By stimulating aerobic bioleaching with S°, up to 80% (660 mg/kg) of the As became soluble in a highly polluted lake sediment (Suesser See) in the form of arsenite and arsenate. Without the addition of S°, the As solubility ranged between 0.6 and 3.5 mg/kg. No toxic effects of As (III) on bacterial growth and microbial activity of the indige nous Thiobacillus spp. were observed. By comparison, the As solubility in an oxic sediment from the river Weisse Elster was low (max. 0.5 mg/kg), while the total Me solubility reached 60% (3.7 g/kg). The anaerobic leaching tests were performed under the conditions of a nitrogen atmosphere in a special vessel allowing the redox potential and the pH of the solution to be continuously recorded. In the lake sediment without adding S°, the As solubility increased temporarily; up to 9% of the total As became soluble, and As (III) was the dominant As soluble species (20 mg/kg). In the late leaching phase ( - 300 mV), the total soluble As decreased, and As (V) became the major soluble species (3.9 mg/kg). In the presence of S°, soluble As and Me were immobilized. The inhibition of As and Me release can be explained by fixation as insoluble sulphides, suggesting that immobilization was driven by dissimilatory sulphur reduction. The data indicatethat the availability of oxidizable sulphur and the oxidation state of the polluted material play an important role in assessing the release of arsenic and heavy metals, including anaerobic conditions. Attention has to be paid to the maintaining of strong anaerobic conditions in sulphur-rich materials in order to prevent the mobilization of pollutants.
ID 6019
Persistent UFZ Identifier
Seidel, H., Mattusch, J., Wennrich, R., Morgenstern, P., Ondruschka, J. (2002):
Mobilization of arsenic and heavy metals from contaminated sediments by changing the environmental conditions
Acta Biotechnol. 22 (1-2), 153 - 160