You are the lead engineer at a bioremediation field site that is contaminated with 330 mg/L...

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Chemistry

You are the lead engineer at a bioremediation field site that iscontaminated with 330 mg/L PCE, which has a molecular formula ofC2Cl4. The other available electron acceptors are: oxygen at 8mg/L, nitrate (NO3-) at 600 mg/L, Fe(OH)3 at 600 mmol/L, andsulfate (SO42-) at 250 mg/L. When these are reduced they become:water, NH4+, Fe2+, and S2-, respectively. PCE must be reducedcompletely to ethene (C2H4) or the local community group willprotest. However, all of the other electron acceptors must becompletely reduced for this to happen (i.e. everything needs to becompletely reduced.) You are going to use ethanol (C2H6O) as theelectron donor for all of these reactions, and it is oxidized tobicarbonate (HCO3-). What is the minimum concentration of ethanolyou need to get the job done in mg/L ethanol?

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4.4 Ratings (754 Votes)

Redox reactions involved Oxidationhalf rxn C2H6O 5H2O2HCO3 14H 12e REDUCTION RXNS 1C2Cl4 2H2 4eC2H4 4Cl 2NO3 10H 8eNH4 3H2O 3O2 4H 4e2H2O 4Fe3 eFe2 5SO42 10H 8eH2S4H2O See Answer

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