Fenton oxidation to remediate PAHs in contaminated soils: A critical review of major limitations and counter-strategies

M. Usman*, K. Hanna, S. Haderlein

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

114 Citations (Scopus)

Abstract

Fenton oxidation constitutes a viable remediation strategy to remove polycyclic aromatic hydrocarbons (PAHs) in contaminated soils. This review is intended to illustrate major limitations associated with this process like acidification, PAH unavailability, and deterioration of soil quality along with associated factors, followed by a critical description of various developments to overcome these constraints. Considering the limitation that its optimal pH is around 3, traditional Fenton treatment could be costly, impractical in soil due to the high buffering capacity of soils and associated hazardous effects. Use of various chelating agents (organic or inorganic) allowed oxidation at circumneutral pH but factors like higher oxidant demand, cost and toxicity should be considered. Another alternative is the use of iron minerals that can catalyze Fenton-like oxidation over a wide range of pH, but mobility of these particles in soils (i.e. saturated and unsaturated zones) should be investigated prior to in-situ applications. The PAH-unavailability is the crucial limitation hindering their effective degradation. Research data is compiled describing various strategies to address this issue like the use of availability enhancement agents, extraction or thermal pretreatment. Last section of this review is devoted to describe the effects of various developments in Fenton treatment onto soil quality and native microbiota. Finally, research gaps are discussed to suggest future directions in context of applying Fenton oxidation to remediate contaminated soils.

Original languageEnglish
Pages (from-to)179-190
Number of pages12
JournalScience of the Total Environment
Volume569-570
DOIs
Publication statusPublished - Nov 1 2016
Externally publishedYes

Keywords

  • Fenton oxidation
  • PAH remediation
  • PAH unavailability
  • pH
  • Soil quality

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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