The Development Of Physico-chemico
Enhanced Washing For Fine-grained Soil
Author(s)
H. Shin & J. Park
Abstract
Soil contamination problems are frequently found in many brownfield
redevelopment sites. Various soil remediation technologies have been considered
for the clean-up of those contaminated urban renewal sites. Soil washing
remediation techniques have been applied, however, granular soils have been
treated with soil washing processes since the removal efficiencies on
fine-grained soil were very low in most cases. Fine-grained soil, which is
considered as waste, has been disposed of at landfills. In this study, novel
soil-washing equipment for fine-grained soil, using highly pressurized water to
apply physical impact on the slurry and using chemical agents to promote
chemical reactions, was developed. Field soil contaminated by heavy metals
from an old refinery site in South Korea was investigated to evaluate the
contaminant removal efficiency. Ethylene-diamine-tetraacetic acid (EDTA), a
chelating agent, was selected to desorb heavy metals from the soil surface.
Physical energy was applied using highly pressurized water. Three different
kinds of soil-washing methods, including physical desorption, chemical
solubilization, and the combined effort, were conducted in this study. The best
removal efficiency was found in the combination of physical and chemical
treatments at 89% of Pb, 87% of Cu and 84% of As. The test results show that
the efficiency in the removal of contaminants in the soil washing system can be
enhanced using a physical forcing system.
Keywords: soil washing, fine-grained soil, physical impact force, surfactant,
EDTA.
Keywords
soil washing, fine-grained soil, physical impact force, surfactant,
EDTA.
Related Book
Other papers in this volume
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