Sulfate radical-advanced oxidation process (SR-AOP) for simultaneous removal of refractory organic contaminants and ammonia in landfill leachate

Yang Deng, Casey M. Ezyske

Research output: Contribution to journalArticleResearchpeer-review

193 Citations (Scopus)

Abstract

Typically, a mature landfill leachate contains high levels of non-biodegradable organics and ammonia nitrogen. Simultaneous removal of the both persistent leachate pollutants is a significant challenge. This paper reports the first scientific study to apply a sulfate radical (SO4·-) - based advanced oxidation process (SR-AOP) to treat a mature leachate, with an emphasis of concurrent removal of refractory organics and ammonia. In this study, all the experiments were run in a batch reactor with temperature control. In the thermal persulfate oxidation (TPO) process, persulfate (S 2O 8 2-) was activated by heat to produce powerful oxidants, SO4·- (E o = 2.6 V). Three factors affecting the removal efficiencies of chemical oxygen demand (COD) and ammonia nitrogen were investigated, including initial solution pH (3-8.3), temperature (27-50 °C), and chemical dose (S2O82-:12COD 0 = 0.25-2.0). Typically, acidic pH (3-4), higher temperature, and higher dose favored the removal of COD and ammonia. At S2O82-:12COD 0 = 2 and 50 °C, the COD removal rates were 79% and 91% at pH 8.3 (no pH adjustment) and 4, respectively; and the ammonia nitrogen removal reached 100% at pH 8.3 or 4. SR-AOP appears to be more advantageous over hydroxyl radical (OH·)-based advanced oxidation processes (HR-AOPs) because OH· almost does not oxidize ammonia. Furthermore, compared with Fenton treatment of the same batch leachate sample, the TPO could achieve a higher COD removal at an identical chemical dose. For example, COD removal was 40% at H 2O 2:2.125COD 0 = 2 during Fenton treatment (pH 3), but 91% at S2O82-:12COD 0 = 2 during TPO (pH 4). These findings demonstrate that SR-AOP is a promising landfill leachate treatment method.

Original languageEnglish
Pages (from-to)6189-6194
Number of pages6
JournalWater Research
Volume45
Issue number18
DOIs
StatePublished - 15 Nov 2011

Fingerprint

Land fill
Refractory materials
Ammonia
ammonia
Impurities
Chemical oxygen demand
sulfate
oxidation
Oxidation
chemical oxygen demand
pollutant
leachate
hydroxyl radical
nitrogen
Leachate treatment
Nitrogen
Nitrogen removal
Sulfates
removal
landfill leachate

Keywords

  • Ammonia
  • Heat
  • Landfill leachate
  • Persulfate
  • Refractory organics
  • Sulfate radical

Cite this

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title = "Sulfate radical-advanced oxidation process (SR-AOP) for simultaneous removal of refractory organic contaminants and ammonia in landfill leachate",
abstract = "Typically, a mature landfill leachate contains high levels of non-biodegradable organics and ammonia nitrogen. Simultaneous removal of the both persistent leachate pollutants is a significant challenge. This paper reports the first scientific study to apply a sulfate radical (SO4·-) - based advanced oxidation process (SR-AOP) to treat a mature leachate, with an emphasis of concurrent removal of refractory organics and ammonia. In this study, all the experiments were run in a batch reactor with temperature control. In the thermal persulfate oxidation (TPO) process, persulfate (S 2O 8 2-) was activated by heat to produce powerful oxidants, SO4·- (E o = 2.6 V). Three factors affecting the removal efficiencies of chemical oxygen demand (COD) and ammonia nitrogen were investigated, including initial solution pH (3-8.3), temperature (27-50 °C), and chemical dose (S2O82-:12COD 0 = 0.25-2.0). Typically, acidic pH (3-4), higher temperature, and higher dose favored the removal of COD and ammonia. At S2O82-:12COD 0 = 2 and 50 °C, the COD removal rates were 79{\%} and 91{\%} at pH 8.3 (no pH adjustment) and 4, respectively; and the ammonia nitrogen removal reached 100{\%} at pH 8.3 or 4. SR-AOP appears to be more advantageous over hydroxyl radical (OH·)-based advanced oxidation processes (HR-AOPs) because OH· almost does not oxidize ammonia. Furthermore, compared with Fenton treatment of the same batch leachate sample, the TPO could achieve a higher COD removal at an identical chemical dose. For example, COD removal was 40{\%} at H 2O 2:2.125COD 0 = 2 during Fenton treatment (pH 3), but 91{\%} at S2O82-:12COD 0 = 2 during TPO (pH 4). These findings demonstrate that SR-AOP is a promising landfill leachate treatment method.",
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Sulfate radical-advanced oxidation process (SR-AOP) for simultaneous removal of refractory organic contaminants and ammonia in landfill leachate. / Deng, Yang; Ezyske, Casey M.

In: Water Research, Vol. 45, No. 18, 15.11.2011, p. 6189-6194.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

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AU - Deng, Yang

AU - Ezyske, Casey M.

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N2 - Typically, a mature landfill leachate contains high levels of non-biodegradable organics and ammonia nitrogen. Simultaneous removal of the both persistent leachate pollutants is a significant challenge. This paper reports the first scientific study to apply a sulfate radical (SO4·-) - based advanced oxidation process (SR-AOP) to treat a mature leachate, with an emphasis of concurrent removal of refractory organics and ammonia. In this study, all the experiments were run in a batch reactor with temperature control. In the thermal persulfate oxidation (TPO) process, persulfate (S 2O 8 2-) was activated by heat to produce powerful oxidants, SO4·- (E o = 2.6 V). Three factors affecting the removal efficiencies of chemical oxygen demand (COD) and ammonia nitrogen were investigated, including initial solution pH (3-8.3), temperature (27-50 °C), and chemical dose (S2O82-:12COD 0 = 0.25-2.0). Typically, acidic pH (3-4), higher temperature, and higher dose favored the removal of COD and ammonia. At S2O82-:12COD 0 = 2 and 50 °C, the COD removal rates were 79% and 91% at pH 8.3 (no pH adjustment) and 4, respectively; and the ammonia nitrogen removal reached 100% at pH 8.3 or 4. SR-AOP appears to be more advantageous over hydroxyl radical (OH·)-based advanced oxidation processes (HR-AOPs) because OH· almost does not oxidize ammonia. Furthermore, compared with Fenton treatment of the same batch leachate sample, the TPO could achieve a higher COD removal at an identical chemical dose. For example, COD removal was 40% at H 2O 2:2.125COD 0 = 2 during Fenton treatment (pH 3), but 91% at S2O82-:12COD 0 = 2 during TPO (pH 4). These findings demonstrate that SR-AOP is a promising landfill leachate treatment method.

AB - Typically, a mature landfill leachate contains high levels of non-biodegradable organics and ammonia nitrogen. Simultaneous removal of the both persistent leachate pollutants is a significant challenge. This paper reports the first scientific study to apply a sulfate radical (SO4·-) - based advanced oxidation process (SR-AOP) to treat a mature leachate, with an emphasis of concurrent removal of refractory organics and ammonia. In this study, all the experiments were run in a batch reactor with temperature control. In the thermal persulfate oxidation (TPO) process, persulfate (S 2O 8 2-) was activated by heat to produce powerful oxidants, SO4·- (E o = 2.6 V). Three factors affecting the removal efficiencies of chemical oxygen demand (COD) and ammonia nitrogen were investigated, including initial solution pH (3-8.3), temperature (27-50 °C), and chemical dose (S2O82-:12COD 0 = 0.25-2.0). Typically, acidic pH (3-4), higher temperature, and higher dose favored the removal of COD and ammonia. At S2O82-:12COD 0 = 2 and 50 °C, the COD removal rates were 79% and 91% at pH 8.3 (no pH adjustment) and 4, respectively; and the ammonia nitrogen removal reached 100% at pH 8.3 or 4. SR-AOP appears to be more advantageous over hydroxyl radical (OH·)-based advanced oxidation processes (HR-AOPs) because OH· almost does not oxidize ammonia. Furthermore, compared with Fenton treatment of the same batch leachate sample, the TPO could achieve a higher COD removal at an identical chemical dose. For example, COD removal was 40% at H 2O 2:2.125COD 0 = 2 during Fenton treatment (pH 3), but 91% at S2O82-:12COD 0 = 2 during TPO (pH 4). These findings demonstrate that SR-AOP is a promising landfill leachate treatment method.

KW - Ammonia

KW - Heat

KW - Landfill leachate

KW - Persulfate

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KW - Sulfate radical

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