Effects of inorganic anions on Fenton oxidation of organic species in landfill leachate

Yang Deng, Edualberto Rosario-Muniz, Xingmao Ma

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Fenton oxidation typically achieves only a moderate removal efficiency of chemical oxidation demand (COD) in treatment of a landfill leachate, incomparable to some other chemical oxidation processes (e.g. electrochemical oxidation). A traditional viewpoint is that the remaining highly oxidized organic species become recalcitrant to hydroxyl radical (OH·)-induced oxidation at a higher degree of Fenton oxidation. Although this may, at least partially, be true, the effects of inorganic anions, which are abundant in leachate, on Fenton oxidation have been largely ignored. The objective of this study is to assess the roles of three inorganic anions (nitrate, sulfate, and chloride) originally present in or externally added to leachate during Fenton oxidation of refractory organic species in leachate. Nitrate (NO 3 -) did not significantly affect the COD removal rate. In contrast, sulfate (SO 4- 2) and chloride (Cl -), particularly the latter, inhibited Fenton oxidation. Their inhibiting effect may be ascribed to: (1) scavenging of OH·; and (2) competition with H 2O 2 to form Fe(III) complexes, thus preventing the Fe(II) regeneration from Fe(III) reduction. At 2.125H 2O 2:initial COD(COD 0) = 9.0, [H 2O 2]:[Fe 2+] = 3, and pH = 3.0, 96, 62, 49, and 37% of COD 0 (1254mgL -1) were removed in the presence of 0, 1270, 5000, and 10000mgL -1 Cl -, respectively.

Original languageEnglish
Pages (from-to)12-19
Number of pages8
JournalWaste Management and Research
Volume30
Issue number1
DOIs
StatePublished - 1 Jan 2012

Fingerprint

Land fill
Negative ions
Oxidation
Nitrates
Electrochemical oxidation
Scavenging
Refractory materials

Keywords

  • Chloride
  • Fenton oxidation
  • Hydroxyl radicals
  • Landfill leachate
  • Nitrate
  • Sulfate

Cite this

Deng, Yang ; Rosario-Muniz, Edualberto ; Ma, Xingmao. / Effects of inorganic anions on Fenton oxidation of organic species in landfill leachate. In: Waste Management and Research. 2012 ; Vol. 30, No. 1. pp. 12-19.
@article{f16e40c4680840a69a0382c09487f95f,
title = "Effects of inorganic anions on Fenton oxidation of organic species in landfill leachate",
abstract = "Fenton oxidation typically achieves only a moderate removal efficiency of chemical oxidation demand (COD) in treatment of a landfill leachate, incomparable to some other chemical oxidation processes (e.g. electrochemical oxidation). A traditional viewpoint is that the remaining highly oxidized organic species become recalcitrant to hydroxyl radical (OH·)-induced oxidation at a higher degree of Fenton oxidation. Although this may, at least partially, be true, the effects of inorganic anions, which are abundant in leachate, on Fenton oxidation have been largely ignored. The objective of this study is to assess the roles of three inorganic anions (nitrate, sulfate, and chloride) originally present in or externally added to leachate during Fenton oxidation of refractory organic species in leachate. Nitrate (NO 3 -) did not significantly affect the COD removal rate. In contrast, sulfate (SO 4- 2) and chloride (Cl -), particularly the latter, inhibited Fenton oxidation. Their inhibiting effect may be ascribed to: (1) scavenging of OH·; and (2) competition with H 2O 2 to form Fe(III) complexes, thus preventing the Fe(II) regeneration from Fe(III) reduction. At 2.125H 2O 2:initial COD(COD 0) = 9.0, [H 2O 2]:[Fe 2+] = 3, and pH = 3.0, 96, 62, 49, and 37{\%} of COD 0 (1254mgL -1) were removed in the presence of 0, 1270, 5000, and 10000mgL -1 Cl -, respectively.",
keywords = "Chloride, Fenton oxidation, Hydroxyl radicals, Landfill leachate, Nitrate, Sulfate",
author = "Yang Deng and Edualberto Rosario-Muniz and Xingmao Ma",
year = "2012",
month = "1",
day = "1",
doi = "10.1177/0734242X10378185",
language = "English",
volume = "30",
pages = "12--19",
journal = "Waste Management and Research",
issn = "0734-242X",
publisher = "SAGE Publications Ltd",
number = "1",

}

Effects of inorganic anions on Fenton oxidation of organic species in landfill leachate. / Deng, Yang; Rosario-Muniz, Edualberto; Ma, Xingmao.

In: Waste Management and Research, Vol. 30, No. 1, 01.01.2012, p. 12-19.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of inorganic anions on Fenton oxidation of organic species in landfill leachate

AU - Deng, Yang

AU - Rosario-Muniz, Edualberto

AU - Ma, Xingmao

PY - 2012/1/1

Y1 - 2012/1/1

N2 - Fenton oxidation typically achieves only a moderate removal efficiency of chemical oxidation demand (COD) in treatment of a landfill leachate, incomparable to some other chemical oxidation processes (e.g. electrochemical oxidation). A traditional viewpoint is that the remaining highly oxidized organic species become recalcitrant to hydroxyl radical (OH·)-induced oxidation at a higher degree of Fenton oxidation. Although this may, at least partially, be true, the effects of inorganic anions, which are abundant in leachate, on Fenton oxidation have been largely ignored. The objective of this study is to assess the roles of three inorganic anions (nitrate, sulfate, and chloride) originally present in or externally added to leachate during Fenton oxidation of refractory organic species in leachate. Nitrate (NO 3 -) did not significantly affect the COD removal rate. In contrast, sulfate (SO 4- 2) and chloride (Cl -), particularly the latter, inhibited Fenton oxidation. Their inhibiting effect may be ascribed to: (1) scavenging of OH·; and (2) competition with H 2O 2 to form Fe(III) complexes, thus preventing the Fe(II) regeneration from Fe(III) reduction. At 2.125H 2O 2:initial COD(COD 0) = 9.0, [H 2O 2]:[Fe 2+] = 3, and pH = 3.0, 96, 62, 49, and 37% of COD 0 (1254mgL -1) were removed in the presence of 0, 1270, 5000, and 10000mgL -1 Cl -, respectively.

AB - Fenton oxidation typically achieves only a moderate removal efficiency of chemical oxidation demand (COD) in treatment of a landfill leachate, incomparable to some other chemical oxidation processes (e.g. electrochemical oxidation). A traditional viewpoint is that the remaining highly oxidized organic species become recalcitrant to hydroxyl radical (OH·)-induced oxidation at a higher degree of Fenton oxidation. Although this may, at least partially, be true, the effects of inorganic anions, which are abundant in leachate, on Fenton oxidation have been largely ignored. The objective of this study is to assess the roles of three inorganic anions (nitrate, sulfate, and chloride) originally present in or externally added to leachate during Fenton oxidation of refractory organic species in leachate. Nitrate (NO 3 -) did not significantly affect the COD removal rate. In contrast, sulfate (SO 4- 2) and chloride (Cl -), particularly the latter, inhibited Fenton oxidation. Their inhibiting effect may be ascribed to: (1) scavenging of OH·; and (2) competition with H 2O 2 to form Fe(III) complexes, thus preventing the Fe(II) regeneration from Fe(III) reduction. At 2.125H 2O 2:initial COD(COD 0) = 9.0, [H 2O 2]:[Fe 2+] = 3, and pH = 3.0, 96, 62, 49, and 37% of COD 0 (1254mgL -1) were removed in the presence of 0, 1270, 5000, and 10000mgL -1 Cl -, respectively.

KW - Chloride

KW - Fenton oxidation

KW - Hydroxyl radicals

KW - Landfill leachate

KW - Nitrate

KW - Sulfate

UR - http://www.scopus.com/inward/record.url?scp=84856428676&partnerID=8YFLogxK

U2 - 10.1177/0734242X10378185

DO - 10.1177/0734242X10378185

M3 - Article

C2 - 20627993

AN - SCOPUS:84856428676

VL - 30

SP - 12

EP - 19

JO - Waste Management and Research

JF - Waste Management and Research

SN - 0734-242X

IS - 1

ER -