Treatment of acid rock drainage using a sulfate-reducing bioreactor with zero-valent iron

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This study assessed the bioremediation of acid rock drainage (ARD) in flow-through columns testing zero-valent iron (ZVI) for the first time as the sole exogenous electron donor to drive sulfate-reducing bacteria in permeable reactive barriers. Columns containing ZVI, limestone or a mixture of both materials were inoculated with an anaerobic mixed culture and fed a synthetic ARD containing sulfuric acid and heavy metals (initially copper, and later also cadmium and lead). ZVI significantly enhanced sulfate reduction and the heavy metals were extensively removed (>99.7%). Solid-phase analyses showed that heavy metals were precipitated with biogenic sulfide in the columns packed with ZVI. Excess sulfide was sequestered by iron, preventing the discharge of dissolved sulfide. In the absence of ZVI, heavy metals were also significantly removed (>99.8%) due to precipitation with hydroxide and carbonate ions released from the limestone. Vertical-profiles of heavy metals in the columns packing, at the end of the experiment, demonstrated that the ZVI columns still had excess capacity to remove heavy metals, while the capacity of the limestone control column was approaching saturation. The ZVI provided conditions that enhanced sulfate reduction and generated alkalinity. Collectively, the results demonstrate an innovative passive ARD remediation process using ZVI as sole electron-donor.

Original languageEnglish (US)
Pages (from-to)97-105
Number of pages9
JournalJournal of Hazardous Materials
Volume308
DOIs
StatePublished - May 5 2016

Fingerprint

Bioreactors
bioreactor
Sulfates
Drainage
Iron
Rocks
drainage
sulfate
Heavy Metals
iron
Heavy metals
Acids
acid
heavy metal
rock
Calcium Carbonate
Sulfides
Limestone
Therapeutics
sulfide

Keywords

  • Anaerobic
  • Bioremediation
  • Copper
  • Heavy metal
  • Permeable reactive barrier

ASJC Scopus subject areas

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

Cite this

Treatment of acid rock drainage using a sulfate-reducing bioreactor with zero-valent iron. / Ayala-Parra, Pedro; Sierra Alvarez, Maria Reye; Field, James A.

In: Journal of Hazardous Materials, Vol. 308, 05.05.2016, p. 97-105.

Research output: Contribution to journalArticle

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