Combined steam distillation and electrochemical peroxidation (ECP) treatment of river sediment contaminated by PCBs

Electro-Fenton Process and Related Electrochemical Technologies Based on Fenton’s Reaction Chemistry

“…It is here worth reminding that less significant degradation was reported for BSA using Fered-Fenton and photoassisted Fered-Fenton 266 (see Figure 32b), as described in sections 6.1 and 6.4, respectively. In contrast, the efficient destruction of PCBs 276,277 and hexachlorobenzene 282 by ECP has been reported.…”

Influence of the operating conditions on highly oxidative radicals generation in Fenton's systems

“…The chemistry of the Fenton's process is based upon the reaction of hydrogen peroxide (E 0 = 1.80 and 0.87 V at pH 0 and 14 respectively) with a proper catalyst, leading to the generation of a pool of radicals [1], capable of non-selectively oxidizing a wide range of biorefractory organic pollutants such as chlorinated aliphatics, halogenated phenols, PAHs and PCBs. The radical produced in the Fenton's initiation Reaction (I) is the hydroxyl radical, whose formation can be achieved by adding an homogeneous catalyst, such as a transition metal salt [3,4], by generating the metal catalyst electrochemically by means of sacrificial steel electrodes or by using the metals naturally occurring in the environment as heterogeneous catalyst [5][6][7][8][9][10][11][12] The hydroxyl radicals generated through Reaction (I) react with hydrogen peroxide and begin a series of propagation reactions [2] …”

SCFA lead lab technical assistance at Oak Ridge Y-12 nationalsecurity complex: Evaluation of treatment and characterizationalternatives of mixed waste soil and debris at disposal area remedialaction DARA solids storage facility (SSF)

“…There are references on the Internet to a patented (circa 1998) supercritical water oxidation process developed by SRI International, although further searches did not indicate commercial availability of this process. Chiarenzelli et al (2001) describe a combined treatment process utilizing steam distillation followed by electrochemical peroxidation that removed > 90% of the polychlorinated biphenyls (PCBs) in river sediment and destroyed 95% of the PCBs recovered in the condensate. Oxidation is primarily mediated by hydroxyl radicals produced by the reaction of hydrogen peroxide with electrochemically generated ferrous iron (Fenton's reaction).…”