Cleaning up sites with on-site process plants. Part 4

Daley, Peter S

doi:10.1021/es00066a002

Cited by 19 publications

(11 citation statements)

References 5 publications

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“…There is a lack of strategies for dealing with heavy metal contaminated soils (Daley, 1989;Sims, 1990;Sheppard and Thibault, 1992). Excavation of metal polluted soils to landfills is common practice in many European countries but the costs involved and the ever decreasing amount of acreage available for dumping has intensified the search for efficient, cost effective treatment methods for metal-polluted soils.…”

Section: Introductionmentioning

confidence: 99%

“…Excavation of metal polluted soils to landfills is common practice in many European countries but the costs involved and the ever decreasing amount of acreage available for dumping has intensified the search for efficient, cost effective treatment methods for metal-polluted soils. Present technologies include chemical stabilization, physical separation and extraction techniques (Assink, 1988;Daley, 1989;Esposito et al, 1989). Conventional stabilization techniques involve pH increase and/or immobilization through addition of lime or alumo-silicates (DeBoodt, 1991;Powell and Mahalingan, 1992;Mench et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

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Feasibility of a counter-current extraction procedure for the removal of heavy metals from contaminated soils

Masscheleyn

Verloo

1996

Water Air Soil Pollut

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Feasibility of a counter-current extraction procedure for the removal of heavy metals from contaminated soils

Masscheleyn

Verloo

1996

Water Air Soil Pollut

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“…Thermal treatment is already an established technology for soil cleanup and is expected to be the basis for new above-ground and in situ decontamination processes. Thermal technologies are often selected to clean soils at Superfund sites (2) because they can provide high destruction and removal efficiencies (DREs) for diverse organic contaminants (3). Broadly based public acceptance is important to the selection, siting, and sustainable operation of virtually any environmental remediation technology.…”

Section: Introductionmentioning

confidence: 99%

Thermal removal of pyrene contamination from soil: basic studies and environmental health implications.

Saitô

Bucalá

Howard

et al. 1998

Environ Health Perspect

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Effects of temperature (400-1000 degrees C) and rate of heating to 550 degrees C (100, 1000, 5000 degrees C/sec) on reduction of pyrene contamination in a Superfund-related soil and on yields of volatile products (tars, CO, CO2, methane, acetylene, ethylene) have been measured. Fifty (+/- 3)-milligram thin layers (less than or equal to 150 micron) of 63- to 125-micron soil particles, neat (i.e., without exogenous chemicals), or pretreated with 4.75 wt% of pyrene, were heated for about 1 to 6 sec, under 3 psig (pounds per in.(2) gauge) of helium in a 12-liter sealed chamber. Pyrene removal, defined as the difference in weight loss of neat versus contaminated soil, was virtually immune to heating rate but increased strongly with increasing temperature, approaching 100% at about 530 degrees C. However, for pyrenepolluted soil, excess soil weight loss and modified CO yields were observed above about 500 degrees C for a 1000 degrees C/sec heating rate. These observations suggest that soil chemical reactions with pyrene or pyrene decomposition products augment soil volatilization. Consequently at elevated temperatures, the difference in weight loss protocol may overestimate polycyclic aromatic hydrocarbon (PAH) removal from soil. Increasing heating rate caused yields of CO, CO(2), and acetylene from pyrene-polluted soil to pass through maxima. Heating neat or contaminated soil resulted in at least two gaseous products of particular environmental interest:acetylene, a precursor to PAH in thermal synthesis, and CO, a toxin to human hemoglobin. Images Figure 1 Figure 2

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“…Organic contaminants can range from high boiling, semi-volatile compounds such as PCBs to low boiling, volatile compounds [3]. Volatile organic compounds such as acetone, chloroethene, benzene, and toluene; and semi-volatiles such as ethyl benzene and xylene have been shown to be effectively removed from the soil matrices [4].…”

Section: Introductionmentioning

confidence: 99%