Field trials to assess the use of iron-bearing industrial by-products for stabilisation of chromated copper arsenate-contaminated soil.
Two industrial by-products with high iron contents were tested for their effectiveness in the stabilisation of arsenic and trace metals in chromated copper arsenate (CCA)-contaminated soil. Steel abrasive (SA; 97% Fe(0)) and oxygen scarfing granulate (OSG; 69% Fe(3)O(4)) were applied at levels of 1% and 8% (w/w) respectively to two soils with different organic matter contents. Field lysimeter measurements indicated that SA and OSG treatments decreased the arsenic concentration in pore water by 68% and 92%, respectively, for the soil with low organic matter content, and by about 30% in pore water of soil with high organic matter content. At pH < or =6, the amended soil with low organic content contained elevated levels of manganese and nickel in their pore water, which were sufficient to induce cytotoxic effects in L-929 mouse fibroblast cells. The industrial by-products have significant potential for soil amendment at field-scale, but caution is required because of the potential release of their chemical contaminants and their reduced capacity for sorption of arsenic in organic-rich soils.
Lidelöw
Sofia
S
Division of Waste Science and Technology, Luleå University of Technology, SE-97187, Luleå, Sweden. soli@ltu.se
Ragnvaldsson
Daniel
D
Leffler
Per
P
Tesfalidet
Solomon
S
Maurice
Christian
C
D000818:Animals; D001149:Arsenates / Q000032:analysis / Q000737:chemistry* / Q000633:toxicity; D001151:Arsenic / Q000032:analysis; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis; D051379:Mice; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry* / Q000633:toxicity; D013232:Steel; D018505:Waste Management / Q000379:methods