Experimental and numerical analysis of metal leaching from fly ash-amended highway bases

Journal Article · Tue May 15 04:00:00 EDT 2012 · Waste Management

DOI:https://doi.org/10.1016/j.wasman.2011.12.012· OSTI ID:21612975

Cetin, Bora ^[1]; Li, Lin ^[2]

---

1. Department of Civil and Environmental Engineering, University of Maryland, College Park, MD 20742 (United States)
2. Department of Civil and Environmental Engineering, Jackson State University, Jackson, MS 17068 (United States)

Highlights: Black-Right-Pointing-Pointer This study is the evaluation of leaching potential of fly ash-lime mixed soils. Black-Right-Pointing-Pointer This objective is met with experimental and numerical analysis. Black-Right-Pointing-Pointer Zn leaching decreases with increase in fly ash content while Ba, B, Cu increases. Black-Right-Pointing-Pointer Decrease in lime content promoted leaching of Ba, B and Cu while Zn increases. Black-Right-Pointing-Pointer Numerical analysis predicted lower field metal concentrations. - Abstract: A study was conducted to evaluate the leaching potential of unpaved road materials (URM) mixed with lime activated high carbon fly ashes and to evaluate groundwater impacts of barium, boron, copper, and zinc leaching. This objective was met by a combination of batch water leach tests, column leach tests, and computer modeling. The laboratory tests were conducted on soil alone, fly ash alone, and URM-fly ash-lime kiln dust mixtures. The results indicated that an increase in fly ash and lime content has significant effects on leaching behavior of heavy metals from URM-fly ash mixture. An increase in fly ash content and a decrease in lime content promoted leaching of Ba, B and Cu whereas Zn leaching was primarily affected by the fly ash content. Numerically predicted field metal concentrations were significantly lower than the peak metal concentrations obtained in laboratory column leach tests, and field concentrations decreased with time and distance due to dispersion in soil vadose zone.

• OSTI ID: 21612975
• Journal Information: Waste Management, Journal Name: Waste Management Journal Issue: 5 Vol. 32; ISSN WAMAE2; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
AEROSOL WASTES
ALKALINE EARTH METALS
ASHES
BARIUM
BORON
CARBON
COMBUSTION PRODUCTS
COMPUTERIZED SIMULATION
COPPER
DISSOLUTION
ELEMENTS
FLY ASH
GROUND WATER
HEAVY METALS
HYDROGEN COMPOUNDS
KILNS
LEACHING
MATHEMATICS
METALS
NONMETALS
NUMERICAL ANALYSIS
OXYGEN COMPOUNDS
RESIDUES
ROADS
SEMIMETALS
SEPARATION PROCESSES
SIMULATION
SOILS
STABILIZATION
TRANSITION ELEMENTS
WASTES
WATER
ZINC