Hydrogen peroxide-enhanced iron-mediated aeration for the treatment of mature landfill leachate

Yang Deng, James D. Englehardt

Research output: Contribution to journalArticleResearchpeer-review

26 Citations (Scopus)

Abstract

Municipal landfill leachate is being disallowed for biological treatment by some sewer authorities due to its recalcitrance and corrosiveness, and therefore physicochemical treatment may be needed. In this paper, hydrogen peroxide-enhanced iron (Fe0)-mediated aeration (IMA) was studied as an alternative for the treatment of mature landfill leachate. Bench-scale Taguchi array screening tests and full factorial tests were conducted. Iron grade, initial pH, H2O2 addition rate, and aeration rate significantly influenced both overall chemical oxygen demand (COD) removal and iron consumption. In the enhanced IMA-treated leachate at an initial pH of 8.2, COD was reduced by 50% due to oxidation and coagulation, a level almost equivalent to those obtained by Fenton treatment. Meanwhile, the 5-day biochemical oxygen demand (BOD5)/COD ratio was increased from 0.02 to 0.17. In particular, the effect of initial pH became minor at H2O2 addition rate greater than the theoretical demand for complete oxidation of organics by H2O2. In addition, 83% of 300 mg/L ammonia nitrogen and 38% of 8.30 mS/cm electrical conductivity were removed when the initial pH was not adjusted. Based on these results, the process appears suitable for treatment of mature leachate.

Original languageEnglish
Pages (from-to)293-299
Number of pages7
JournalJournal of Hazardous Materials
Volume153
Issue number1-2
DOIs
StatePublished - 1 May 2008

Fingerprint

Chemical Water Pollutants
Chemical oxygen demand
Land fill
Hydrogen peroxide
Hydrogen Peroxide
Iron
Oxidation
Biochemical oxygen demand
Sewers
Coagulation
Ammonia
Screening
Nitrogen

Keywords

  • Coagulation
  • Iron
  • Landfill leachate
  • Oxidation
  • Recalcitrant organics

Cite this

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title = "Hydrogen peroxide-enhanced iron-mediated aeration for the treatment of mature landfill leachate",
abstract = "Municipal landfill leachate is being disallowed for biological treatment by some sewer authorities due to its recalcitrance and corrosiveness, and therefore physicochemical treatment may be needed. In this paper, hydrogen peroxide-enhanced iron (Fe0)-mediated aeration (IMA) was studied as an alternative for the treatment of mature landfill leachate. Bench-scale Taguchi array screening tests and full factorial tests were conducted. Iron grade, initial pH, H2O2 addition rate, and aeration rate significantly influenced both overall chemical oxygen demand (COD) removal and iron consumption. In the enhanced IMA-treated leachate at an initial pH of 8.2, COD was reduced by 50{\%} due to oxidation and coagulation, a level almost equivalent to those obtained by Fenton treatment. Meanwhile, the 5-day biochemical oxygen demand (BOD5)/COD ratio was increased from 0.02 to 0.17. In particular, the effect of initial pH became minor at H2O2 addition rate greater than the theoretical demand for complete oxidation of organics by H2O2. In addition, 83{\%} of 300 mg/L ammonia nitrogen and 38{\%} of 8.30 mS/cm electrical conductivity were removed when the initial pH was not adjusted. Based on these results, the process appears suitable for treatment of mature leachate.",
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Hydrogen peroxide-enhanced iron-mediated aeration for the treatment of mature landfill leachate. / Deng, Yang; Englehardt, James D.

In: Journal of Hazardous Materials, Vol. 153, No. 1-2, 01.05.2008, p. 293-299.

Research output: Contribution to journalArticleResearchpeer-review

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