Kinetics and oxidative mechanism for H2O2-enhanced iron-mediated aeration (IMA) treatment of recalcitrant organic compounds in mature landfill leachate

Yang Deng, James D. Englehardt

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13 Citations (Scopus)

Abstract

A hydrogen peroxide (H2O2)-enhanced iron (Fe0)-mediated aeration (IMA) process has been recently demonstrated to effectively remove organic wastes from mature landfill leachate. In this paper, the kinetics and oxidative mechanisms of the enhanced IMA treatment were studied. Bench-scale full factorial tests were conducted in an orbital shaker reactor for treatment of a mature leachate with an initial chemical oxygen demand (COD) of 900-1200 mg/L. At the maximum aeration rate (8.3 mL air/min mL sample), process variables significantly influencing the rates of H2O2 decay and COD removal were pH (3.0-8.0), initial H2O2 doses (0.21-0.84 M), and Fe0 surface area concentrations (0.06-0.30 m2/L). Empirical kinetic models were developed and verified for the degradation of H2O2 and COD. High DO maintained by a high aeration rate slowed the H2O2 self-decomposition, accelerated Fe0 consumption, and enhanced the COD removal. In hydroxyl radical (OH{radical dot}) scavenging tests, the rate of removal of glyoxylic acid (target compound) was not inhibited by the addition of para-chlorobenzoic acid (OH{radical dot} scavenger) at pH 7.0-7.5, ruling out hydroxyl radical as the principal oxidant in neutral-weakly basic solution. These experimental results show that this enhanced IMA technology is a potential alternative for the treatment of high strength recalcitrant organic wastewaters.

Original languageEnglish
Pages (from-to)370-375
Number of pages6
JournalJournal of Hazardous Materials
Volume169
Issue number1-3
DOIs
StatePublished - 30 Sep 2009

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Chemical Water Pollutants
Biological Oxygen Demand Analysis
Chemical oxygen demand
Land fill
Organic compounds
aeration
organic compound
Iron
iron
kinetics
chemical oxygen demand
Kinetics
Hydroxyl Radical
hydroxyl radical
Acids
Scavenging
Waste Water
Oxidants
Hydrogen peroxide
Hydrogen Peroxide

Keywords

  • Dissolved oxygen
  • Hydrogen peroxide
  • Iron
  • Landfill leachate
  • Recalcitrant organics

Cite this

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title = "Kinetics and oxidative mechanism for H2O2-enhanced iron-mediated aeration (IMA) treatment of recalcitrant organic compounds in mature landfill leachate",
abstract = "A hydrogen peroxide (H2O2)-enhanced iron (Fe0)-mediated aeration (IMA) process has been recently demonstrated to effectively remove organic wastes from mature landfill leachate. In this paper, the kinetics and oxidative mechanisms of the enhanced IMA treatment were studied. Bench-scale full factorial tests were conducted in an orbital shaker reactor for treatment of a mature leachate with an initial chemical oxygen demand (COD) of 900-1200 mg/L. At the maximum aeration rate (8.3 mL air/min mL sample), process variables significantly influencing the rates of H2O2 decay and COD removal were pH (3.0-8.0), initial H2O2 doses (0.21-0.84 M), and Fe0 surface area concentrations (0.06-0.30 m2/L). Empirical kinetic models were developed and verified for the degradation of H2O2 and COD. High DO maintained by a high aeration rate slowed the H2O2 self-decomposition, accelerated Fe0 consumption, and enhanced the COD removal. In hydroxyl radical (OH{radical dot}) scavenging tests, the rate of removal of glyoxylic acid (target compound) was not inhibited by the addition of para-chlorobenzoic acid (OH{radical dot} scavenger) at pH 7.0-7.5, ruling out hydroxyl radical as the principal oxidant in neutral-weakly basic solution. These experimental results show that this enhanced IMA technology is a potential alternative for the treatment of high strength recalcitrant organic wastewaters.",
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Kinetics and oxidative mechanism for H2O2-enhanced iron-mediated aeration (IMA) treatment of recalcitrant organic compounds in mature landfill leachate. / Deng, Yang; Englehardt, James D.

In: Journal of Hazardous Materials, Vol. 169, No. 1-3, 30.09.2009, p. 370-375.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Kinetics and oxidative mechanism for H2O2-enhanced iron-mediated aeration (IMA) treatment of recalcitrant organic compounds in mature landfill leachate

AU - Deng, Yang

AU - Englehardt, James D.

PY - 2009/9/30

Y1 - 2009/9/30

N2 - A hydrogen peroxide (H2O2)-enhanced iron (Fe0)-mediated aeration (IMA) process has been recently demonstrated to effectively remove organic wastes from mature landfill leachate. In this paper, the kinetics and oxidative mechanisms of the enhanced IMA treatment were studied. Bench-scale full factorial tests were conducted in an orbital shaker reactor for treatment of a mature leachate with an initial chemical oxygen demand (COD) of 900-1200 mg/L. At the maximum aeration rate (8.3 mL air/min mL sample), process variables significantly influencing the rates of H2O2 decay and COD removal were pH (3.0-8.0), initial H2O2 doses (0.21-0.84 M), and Fe0 surface area concentrations (0.06-0.30 m2/L). Empirical kinetic models were developed and verified for the degradation of H2O2 and COD. High DO maintained by a high aeration rate slowed the H2O2 self-decomposition, accelerated Fe0 consumption, and enhanced the COD removal. In hydroxyl radical (OH{radical dot}) scavenging tests, the rate of removal of glyoxylic acid (target compound) was not inhibited by the addition of para-chlorobenzoic acid (OH{radical dot} scavenger) at pH 7.0-7.5, ruling out hydroxyl radical as the principal oxidant in neutral-weakly basic solution. These experimental results show that this enhanced IMA technology is a potential alternative for the treatment of high strength recalcitrant organic wastewaters.

AB - A hydrogen peroxide (H2O2)-enhanced iron (Fe0)-mediated aeration (IMA) process has been recently demonstrated to effectively remove organic wastes from mature landfill leachate. In this paper, the kinetics and oxidative mechanisms of the enhanced IMA treatment were studied. Bench-scale full factorial tests were conducted in an orbital shaker reactor for treatment of a mature leachate with an initial chemical oxygen demand (COD) of 900-1200 mg/L. At the maximum aeration rate (8.3 mL air/min mL sample), process variables significantly influencing the rates of H2O2 decay and COD removal were pH (3.0-8.0), initial H2O2 doses (0.21-0.84 M), and Fe0 surface area concentrations (0.06-0.30 m2/L). Empirical kinetic models were developed and verified for the degradation of H2O2 and COD. High DO maintained by a high aeration rate slowed the H2O2 self-decomposition, accelerated Fe0 consumption, and enhanced the COD removal. In hydroxyl radical (OH{radical dot}) scavenging tests, the rate of removal of glyoxylic acid (target compound) was not inhibited by the addition of para-chlorobenzoic acid (OH{radical dot} scavenger) at pH 7.0-7.5, ruling out hydroxyl radical as the principal oxidant in neutral-weakly basic solution. These experimental results show that this enhanced IMA technology is a potential alternative for the treatment of high strength recalcitrant organic wastewaters.

KW - Dissolved oxygen

KW - Hydrogen peroxide

KW - Iron

KW - Landfill leachate

KW - Recalcitrant organics

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M3 - Article

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EP - 375

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

SN - 0304-3894

IS - 1-3

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