Scoping candidate minerals for stabilization of arsenic-bearing solid residuals

Madhumitha Raghav, Jilei Shan, Avelino E Saez, Wendell P Ela

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Arsenic Crystallization Technology (ACT) is a potentially eco-friendly, effective technology for stabilization of arsenic-bearing solid residuals (ABSRs). The strategy is to convert ABSRs generated by water treatment facilities into minerals with a high arsenic capacity and long-term stability in mature, municipal solid waste landfills. Candidate minerals considered in this study include scorodite, arsenate hydroxyapatites, ferrous arsenates (symplesite-type minerals), tooeleite, and arsenated-schwertmannite. These minerals were evaluated as to ease of synthesis, applicability to use of iron-based ABSRs as a starting material, and arsenic leachability. The Toxicity Characteristic Leaching Procedure (TCLP) was used for preliminary assessment of candidate mineral leaching. Minerals that passed the TCLP and whose synthesis route was promising were subjected to a more aggressive leaching test using a simulated landfill leachate (SLL) solution. Scorodite and arsenate hydroxyapatites were not considered further because their synthesis conditions were not found to be favorable for general application. Tooeleite and silica-amended tooeleite showed high TCLP arsenic leaching and were also not investigated further. The synthesis process and leaching of ferrous arsenate and arsenated-schwertmannite were promising and of these, arsenated-schwertmannite was most stable during SLL testing. The latter two candidate minerals warrant synthesis optimization and more extensive testing.

Original languageEnglish (US)
Pages (from-to)525-532
Number of pages8
JournalJournal of Hazardous Materials
Volume263
DOIs
StatePublished - Dec 15 2013

Fingerprint

Bearings (structural)
Arsenic
Leaching
Minerals
arsenic
stabilization
Stabilization
leaching
arsenate
schwertmannite
mineral
Hydroxyapatites
Chemical Water Pollutants
Land fill
scorodite
Toxicity
toxicity
Hydroxyapatite
Arsenates
mineral synthesis

Keywords

  • Arsenic residuals
  • Ferrous arsenate
  • Landfills
  • Schwertmannite
  • Tooeleite

ASJC Scopus subject areas

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

Cite this

Scoping candidate minerals for stabilization of arsenic-bearing solid residuals. / Raghav, Madhumitha; Shan, Jilei; Saez, Avelino E; Ela, Wendell P.

In: Journal of Hazardous Materials, Vol. 263, 15.12.2013, p. 525-532.

Research output: Contribution to journalArticle

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