Arsenic contaminated site at an abandoned copper smelter plant: waste characterization and solidification/stabilization treatment
Resource
Chemosphere 53 (7): 691-703
Journal
Chemosphere
Journal Volume
53
Journal Issue
7
Pages
691-703
Date Issued
2003
Date
2003
Author(s)
Shih, Chien-Jen
Abstract
A preliminary survey of an arsenic contaminated site from an abandoned copper smelting facility and feasibility study of using solidification/ stabilization (S/S) process to treat the contaminant waste were undertaken. It was found that the waste, located in the three-flue gas discharge tunnels, contained 2-40% arsenic. The pH of the contaminated waste is extremely low (ranging from 1.8 to 3.6). The X-ray diffraction evidence indicates that the arsenic particles present in the flue gas mainly exist as As(III), or As 2O3. The total amount of arsenic contaminated waste is estimated to be 700 ton in the studied area. About 50% of the particle sizes are less than 2 mm. Arsenic is easily extracted from wastes with a variety of leaching solutions. In order to meet the arsenic leaching standard of the toxicity characteristic leaching procedure (TCLP), an extremely high cement dosage is required in the S/S process (cement/waste weight ratio >6). The waste with lower particle size having higher specific surface area exhibits somewhat positive effect on the S/S performance. The use of fly ash from municipal waste incinerators, in conjunction with the reduced amount of cement, is able to meet the TCLP arsenic and lead standards. The use of lime alone could meet the TCLP arsenic standard, but lead leaching concentrations exceeded leaching Pb standard. The results of semi-dynamic leaching tests of some solidified samples indicate higher accumulated arsenic leaching concentrations after only a few leachant renewals. © 2003 Elsevier Ltd. All rights reserved.
Subjects
Arsenic; Copper smelter; Fly ash; Solidification/stabilization; TCLP
Other Subjects
Cements; Contamination; Copper smelting; Particle size analysis; pH effects; Solidification; Toxicity; X ray diffraction analysis; Feasibility; Arsenic; arsenic; cement; copper; calcium derivative; calcium oxide; carbon; copper; oxide; arsenic; contaminated land; fly ash; smelting; solidification; waste management; contamination; extraction; fly ash; incineration; leaching; metal industry; particle size; pH; pollution; review; solid state; waste management; X ray diffraction; article; chemistry; industrial waste; methodology; mining; particulate matter; pollution; Taiwan; Fraxinus; Arsenic; Calcium Compounds; Carbon; Copper; Environmental Pollution; Hydrogen-Ion Concentration; Industrial Waste; Mining; Oxides; Particle Size; Particulate Matter; Taiwan; Waste Management; X-Ray Diffraction
Type
journal article
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