Efficient Decomposition of Trichloroethylene (TCE) in Groundwater by Ozone-Hydrogen Peroxide Treatment

Yasunaga, N.; Hirotsuji, Junji

doi:10.1080/01919510701861284

Cited by 8 publications

(1 citation statement)

References 7 publications

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“…Although it can treat a wide variety of pollutants, it has proven ineffective on BTEX, diesel fuel, and gasoline (Amarante, 2000). Ozone (O 3 ) is also capable of oxidizing pollutants by either direct oxidation or hydroxyl radical generation, but mainly under acidic conditions (Brunet et al , 1984; Masten and Hoigne, 1992; Yasunaga and Hirotsuji, 2008). It is very unstable in the subsurface and requires expensive on-site generation (Amarante, 2000).…”

Section: Introductionmentioning

confidence: 99%

Chelate-Modified Fenton Reaction for the Degradation of Trichloroethylene in Aqueous and Two-Phase Systems

Lewis

Lynch

Bachas

et al. 2009

Environmental Engineering Science

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The primary objective of this research was to model and understand the chelate-modified Fenton reaction for the destruction of trichloroethylene (TCE) present in both the aqueous and organic (in the form of droplets) phases. The addition of a nontoxic chelate (L), such as citrate or gluconic acid, allows for operation at near-neutral pH and controlled release of Fe(II)/Fe(III). For the standard Fenton reaction at low pH in two-phase systems, an optimum H2O2:Fe(II) molar ratio was found to be between 1:1 and 2:1. Experimentation proved the chelate-modified Fenton reaction effectively dechlorinated TCE in both the aqueous and organic phases at pH 6–7 using low H2O2:Fe(II) molar ratios (4:1 to 8:1). Increasing the L:Fe ratio was found to decrease the rate of H2O2 degradation in both Fe(II) and Fe(III) systems at near-neutral pH. Generalized models were developed to predict the concentration of TCE in the aqueous phase and TCE droplet radius as a function of time using literature-reported hydroxyl radical reaction kinetics and mass transfer relationships. Additional aspects of this work include the reusability of the Fe–citrate complex under repeated H2O2 injections in real water systems as well as packed column studies for simulated groundwater injection.

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Section: Introductionmentioning

confidence: 99%