Coal fly ash and synthetic coal fly ash aggregates as reactive media to remove zinc from aqueous solutions

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Coal fly ash (CF) and synthetic coal fly ash aggregates (SCFAs) were evaluated as low-cost reactive media for the remediation of groundwater contaminated with Zn. The SCFAs were prepared by mixing CF, sodium silicate, and deionized (DI) water. Serial batch kinetic and static tests were conducted on both CF and SCFAs, under various conditions (i.e., pH, initial Zn concentration, reaction time, and solid dosage), using Zn(NO3)2·6H2O solutions. Serial column tests were also conducted on both CF and SCFAs. The final rather than the initial pH of the solution had a greater effect on the removal of Zn. At pH > 7.0, the removal of Zn was due to precipitation, whereas at <7.0, the removal of Zn was due to adsorption onto the reactive media. The removal of Zn increased with increasing dosage of the reactive medium and decreasing initial Zn concentration. The results of the column and batch tests were comparable. Preferential flow paths were observed with CF, but not SCFA. The hydraulic conductivity of CF was more significantly decreased than that of SCFA with increasing dry density of the specimen.

Original languageEnglish
Pages (from-to)235-246
Number of pages12
JournalJournal of Hazardous Materials
Volume164
Issue number1
DOIs
Publication statusPublished - 2009 May 15

Fingerprint

Coal Ash
Coal
Fly ash
fly ash
Zinc
aqueous solution
zinc
coal
Deionized water
dry density
preferential flow
Hydraulic conductivity
Remediation
Silicates
hydraulic conductivity
Groundwater

Keywords

  • Coal fly ash
  • Contaminated groundwater
  • Reactive media
  • Synthetic coal fly ash aggregate
  • Zinc

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Environmental Chemistry
  • Environmental Engineering

Cite this

Coal fly ash and synthetic coal fly ash aggregates as reactive media to remove zinc from aqueous solutions. / Hong, Jung Ki; Jo, Ho Young; Yun, Seong Taek.

In: Journal of Hazardous Materials, Vol. 164, No. 1, 15.05.2009, p. 235-246.

Research output: Contribution to journalArticle

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