Engineering design and testing of a ground water remediation system using electrolytically generated hydrogen with a palladium catalyst for dehalogenation of chlorinated hydrogen

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Recent studies have shown that dissolved hydrogen causes rapid dehalogenation of chlorinated hydrocarbons in the presence of a palladium catalyst. The speed and completeness of these reactions offer advantages in designing remediation technologies for certain ground water contamination problems. However, a practical design challenge arises in the need to saturate the aqueous phase with hydrogen in an expeditious manner. To address this issue, a two-stage treatment reactor has been developed. The first stage consists of an electrolytic cell that generates hydrogen by applying a voltage potential across the influent water stream. The second stage consists of a catalyst column of ... continued below

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15 pages

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Ruiz, R. December 1, 1997.

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Description

Recent studies have shown that dissolved hydrogen causes rapid dehalogenation of chlorinated hydrocarbons in the presence of a palladium catalyst. The speed and completeness of these reactions offer advantages in designing remediation technologies for certain ground water contamination problems. However, a practical design challenge arises in the need to saturate the aqueous phase with hydrogen in an expeditious manner. To address this issue, a two-stage treatment reactor has been developed. The first stage consists of an electrolytic cell that generates hydrogen by applying a voltage potential across the influent water stream. The second stage consists of a catalyst column of palladium metal supported on alumina beads. A bench-scale reactor has been used to test this design for treating ground water contaminated with trichloroethene and other chlorinated hydrocarbons. In influent streams containing contaminant concentrations up to 4 ppm, initial results confirm that destruction efficiencies greater than 95% may be achieved with residence times short enough to allow practical implementation in specially designed flow-through treatment wells. Results from the bench-scale tests are being used to design a pilot ground water treatment system.

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15 pages

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OSTI as DE00016590

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  • 1998 Mexican American Engineers and Scientists National Symposium and Career Fair, San Diego, CA (US), 01/14/1998--01/17/1998; Other Information: Supercedes report DE98053180; PBD: 01 Dec 1997

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  • Other: DE98053180
  • Report No.: UCRL-JC--128828
  • Report No.: CONF-980169--
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 16590
  • Archival Resource Key: ark:/67531/metadc622693

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  • December 1, 1997

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  • June 16, 2015, 7:43 a.m.

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  • May 6, 2016, 3:17 p.m.

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Ruiz, R. Engineering design and testing of a ground water remediation system using electrolytically generated hydrogen with a palladium catalyst for dehalogenation of chlorinated hydrogen, article, December 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc622693/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.