Biester, H.; Schuhmacher, P.; Müller, G.
Author Affiliation :
Institute of Environmental Geochemistry, INF 236, D-69120 Heidelberg, Germany.
Water Research (Oxford)
Reduction of bivalent mercury (Hg(II)) by mossy Sn combined with Hg(0) air stripping has been recently proposed as a method to remove Hg from groundwater. The effectiveness of mossy tin to remove Hg(II) from aqueous solution was assessed at different flow rates and determined the retention of Hg through the formation of HgSn amalgams. Results show that mossy Sn layers of only 2 cm thickness can reduce 100% of 800 µg Hg(II)/litre at a flow rate of ∼1 volume of drainable porosity/min (Vol/min), and even 100% of 5000 µg/litre at 0.125 Vol/min, 89 and 97% of the Hg(0) were retained in the filter through amalgamation. No Hg was remobilized from the loaded Sn filters by chloride (10-50 mg Cl-/litre) or dissolved organic carbon (DOC) (0.5-6 mg DOC/litre). The capacity of mossy Sn to adsorb Hg was at least 5-6% of the weight of the filter. The study shows that mossy Sn has a high capacity to remove Hg effectively from aqueous solution. Disadvantages arise from the release of Sn from the filters exceeding legal limits of 20 µg/litre in most cases but occurred as mostly insoluble Sn particles or Sn hydroxide.
Record Number :
Language of text :
Language of summary :
Indexing terms for this abstract:
chemical composition, contaminants, contamination, groundwater, groundwater pollution, mercury, organic carbon, pollution control, porosity, remediation, retention, tin, water quality, water resources
dissolved organic carbon, water composition and quality