Dichloroethane C2H4Cl2 is a common industrial solvent. underground behind an abandoned plant a 700m3 volume of soil...

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Dichloroethane C₂H₄Cl₂ is acommon industrial solvent. underground behind an abandoned plant a700m³ volume of soil is found to be contaminated withthis chemical to an average concentration of 50 ppm. a survey ofthe soil indicates that ample bacteria are present to decompose thewaste according to the following equation:
2C₂H₄Cl₂ + 5O₂---> 4CO₂ + 4HCl + 2H₂O
Presently, however, there is insufficient oxygen available tothe microorganisms, and therefore you decide to pump watercontaining 8 ppm O₂ into the site at a rate of 50L/min.Assume that both the bacteria and dichloroethane are adsorbedirreversibly to the soil. Also assume that 10% of the suppliedoxygen is used by bacteria to degrade dichloroethane according tothe above equation, while the remaining 90% wasted to the soil orto the other microbial processes. How much time is required for theaverage concentration of C₂H₄Cl_{2 at thesite to fall to 10 ppm?}

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3.7 Ratings (415 Votes)

Given the concentration of dichloroethane 50 ppm 50 mgL Total volume of contaminated soil 700 m3 700 m3 x 1000L 1m3 700000 L The mass of Dichloroethane need to be decomposed in order to decrease the concentration to 10 ppm 50 10 mg L x 700000 See Answer

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