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Reduction Processes

Reduction Processes. Another process which involves electron transfer (except in the opposite direction as AOP) is reductive dechlorination. An example is the reduction of halogenated hydrocarbons. . Reductive dehalogenation with zero valent iron:.

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Reduction Processes

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  1. Reduction Processes Another process which involves electron transfer (except in the opposite direction as AOP) is reductive dechlorination. An example is the reduction of halogenated hydrocarbons.

  2. Reductive dehalogenation with zero valent iron:

  3. Hydrogen gasis usually inert but in the presence of Pd, Ni, Pt and possibly Feo hydrodehalogenation is possible. It is also possible that Feo can react with H+ to form H2.

  4. Other chemical species can be reduced by the iron. For example nitrate can be reduced to nitrogen gas:

  5. Potential long term problem: As the dehalogenation process proceeds pH will rise as H+ is used. This could result in precipitation of CaCO3 or FeCO3 which will ultimately reduce porosity of the permeable barrier.

  6. Typical Design Results: First order decay rate approx. 0.03 per hour ( half life = 20 hours) With a Feo barrier of 1.2 m thickness and a flow rate through the barrier equal to 0.4 m/day get approx. 90% reduction in RX.

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