Model of Leaching Behavior from Fly Ash Landfills with Different Age Refuses

Huang, Chiajim; Lu, Chungsying; Tzeng, Jau-Hwan

doi:10.1061/(asce)0733-9372(1998)124:8(767)

Cited by 11 publications

(4 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The silicon was allowed to dry at least overnight before running the leaching test. Assembled columns were then allowed to saturate with deionized water from bottom up until the sand at the surface of the specimen appeared saturated (Huang et al, 1998). At that point, the top of the PVC column was covered with a plastic sheet to prevent evaporation and the bottom outlet in the PVC cap was closed so as to allow the specimen to equilibrate for 2 d (Buczko et al, 2004).…”

Section: Flow Through Leaching Testmentioning

confidence: 99%

Recycled Materials as Substitutes for Virgin Aggregates in Road Construction: II. Inorganic Contaminant Leaching

Kang

Gupta

Bloom

et al. 2011

Soil Science Soc of Amer J

View full text Add to dashboard Cite

Construction and maintenance of roads requires large volume of aggregates for use in base or subbase layers.Because of the expense of buying virgin aggregates, federal and state agencies are encouraging the recycling of waste materials in road construction. A study was under taken to evaluate the suitability of fly ash (FA), reclaimed asphalt pavement (RAP), recycled cement material (RCM), and foundry sand (FS) mixed in with virgin aggregates as base and subbase materials. In this paper we report the results on inorganic contaminants leaching from six mixtures of FA-RAP aggregates under batch and flow through conditions. The concentrations of most inorganic chemicals in both batch and flow through modes from all six mixtures were either below the detection limit of the instrument or less than the EPA drinking water standard. The exceptions were Al and Cr. Aluminum concentrations were higher than the EPA secondary drinking water standard in both batch and flow-through tests whereas Cr concentration exceeded the primary EPA drinking water standard in the flow through tests only. Aluminum concentrations in the leachate increased with a decrease in the proportion of FA whereas Cr concentration in the leachate increased with an increase in the proportion of FA in the mixtures. The mixtures had lower pH compared to 100% FA, due to dilution of Ca(H0)2 in the FA, which resulted in higher Al concentrations. Addition of up to 5% FA and 75% RAP to virgin aggregates does not lead to any substantial leaching of various inorganic chemicals. At 15% FA, there is a slight risk for transport of some dissolved inorganic chemicals at a concentration higher than the EPA primary drinking water standards.

show abstract

Section: Flow Through Leaching Testmentioning

confidence: 99%

Recycled Materials as Substitutes for Virgin Aggregates in Road Construction: II. Inorganic Contaminant Leaching

Kang

Gupta

Bloom

et al. 2011

Soil Science Soc of Amer J

View full text Add to dashboard Cite

show abstract

“…Permeation with the DI water began immediately after the hydration period. The permeant (DI water) was exposed to the atmosphere to simulate the natural water in the normal environment [8,31,33].…”

Section: Column Leaching Test (Clt)mentioning

confidence: 99%

Environmental feasibility of using coal ash as a fill material to raise the ground level

Jo¹,

Min²,

Lee³

et al. 2008

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…Given the complicated physical and chemical processes involved in the leaching of metal from fly ash, column studies are more advantageous than batch studies for testing the leaching behavior and contaminant transport in fly ash (Huang et al 1998), with the flexibility in manipulating flow condition, particle size selection, pore structure, and the ease to obtain hydrodynamic and transport kinetics parameters (Khodadoust et al 2011). Furthermore, column leaching experiments offer the convenience to quantify mass transfer as a function of time (Georgakopoulos et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Elemental Transport from Fly Ash: A Column Study

Zhu¹,

He²

2014

Pavement Materials, Structures, and Performance

View full text Add to dashboard Cite

The development of sustainable management practices for coal fly ash requires the understanding of the release of toxic elements from fly ash into the environment. Reactive mass transfer modeling implemented by AQUASIM was able to adequately describe the release and transport of magnesium and cadmium from fly ash. However, the adsorptive interactions between arsenic and carbon residues in fly ash complicated the modeling of the retardation of arsenic transport in fly ash. Selenium was another toxic element exhibited strong retardation in the column leaching study due to adsorptive interactions. The results from this study suggest that processes in addition to reactive mass transfer need to be included to describe the leaching of elements exhibit strong adsorption/desorption characteristics. The modeling approaches reported in this study provide a framework for assessing the release and transport of toxic elements from fly ash during beneficial reuse.

show abstract

Model of Leaching Behavior from Fly Ash Landfills with Different Age Refuses

Cited by 11 publications

References 25 publications

Recycled Materials as Substitutes for Virgin Aggregates in Road Construction: II. Inorganic Contaminant Leaching

Recycled Materials as Substitutes for Virgin Aggregates in Road Construction: II. Inorganic Contaminant Leaching

Environmental feasibility of using coal ash as a fill material to raise the ground level

Characterization of Elemental Transport from Fly Ash: A Column Study

Contact Info

Product

Resources

About