Field-scale remediation of a metolachlor-contaminated spill site using zerovalent iron

S. D. Comfort, P. J. Shea, T. A. Machacek, H. Gaber, B. T. Oh

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Pesticide spills are common occurrences at agricultural cooperatives and farmsteads. When inadvertent spills occur, chemicals normally beneficial can become point sources of ground and surface water contamination. We report results from a field trial where approximately 765 m3 of soil from a metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl) acetamide] spill site was treated with zerovalent iron (Fe0). Preliminary laboratory experiments confirmed metolachlor dechlorination by Fe0 in aqueous solution and that this process could be accelerated by adding appropriate proportions of Al2(SO4)3 or acetic acid (CH3COOH). The field project was initiated by moving the stockpiled, contaminated soil into windrows using common earth-moving equipment. The soil was then mixed with water (0.35-0.40 kg H2O kg-1) and various combinations of 5% Fe0 (w/w), 2% Al2(SO4)3 (w/w), and 0.5% acetic acid (v/w). Windrows were covered with clear plastic and incubated without additional mixing for 90 d. Approximately every 14 d, the plastic sheeting was removed for soil sampling and the surface of the windrows rewetted. Metolachlor concentrations were significantly reduced and varied among treatments. The addition of Fe0 alone decreased metolachlor concentration from 1789 to 504 mg kg-1 within 90 d, whereas adding Fe0 with Al2(SO4)3 and CH3COOH decreased the concentration from 1402 to 13 mg kg-1. These results provide evidence that zerovalent iron can be used for on-site, field-scale treatment of pesticide-contaminated soil.

Original languageEnglish (US)
Pages (from-to)1636-1643
Number of pages8
JournalJournal of Environmental Quality
Volume30
Issue number5
StatePublished - Sep 29 2001

Fingerprint

metolachlor
Hazardous materials spills
Remediation
remediation
Iron
Soils
iron
acetic acid
Pesticides
Acetic acid
Acetic Acid
pesticide
plastic
agricultural cooperative
soil
Plastics
dechlorination
Dechlorination
point source
Surface waters

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Management, Monitoring, Policy and Law

Cite this

Field-scale remediation of a metolachlor-contaminated spill site using zerovalent iron. / Comfort, S. D.; Shea, P. J.; Machacek, T. A.; Gaber, H.; Oh, B. T.

In: Journal of Environmental Quality, Vol. 30, No. 5, 29.09.2001, p. 1636-1643.

Research output: Contribution to journalArticle

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