Soil vapor extraction is a chosen remedy remove volatile organic compounds. The

Question

Soil vapor extraction is a chosen remedy remove volatile organic compounds. The extracted gas stream contains trichloroethylene (TCE) at 0.0016 kg/m^3 and the extraction gas flow rate is 30 m^3/s. the extracted gas need to be treated using granular activated carbon (GAC). From experimental data it was determined that the TCE adsorption capacity to GAC is 550 mg/g. A commercially available single unit of GAC have the following characteristics: Gas flow capacity through the GAC unit = 4 m^3/s Diameter of the GAC unit = 3.5 m Amount of carbon available in each unit = 5000kg How many GAC units are required to treat the gas stream? What is the daily mass of TCE being removed? What is the daily mass of GAC required to remove TCE from the gas stream? How frequency will the GAC units require regeneration?

Explanation / Answer

1. No. of GAC units needed - total flow rate/ flow rate from 1 GAS                               - 30 m3s- / 4m3s-

`                                                                - 7.5 ------ 8 units.

2. Amount of GAC available - 5000 kg = 5000,000g

TCE absorption capacity 550mg/g

So total TCE absorbed   - 550 mg/g * 5000,000g

TCE amount per second                 - 0.0016kg/m3 * 30m3s-

                                                         -0.048kgs-

Daily TCE amount                         - 0.048kgs- * 60*60*24

(60s ---- 1 min, 60min ----1hr, 24 hr---1dy)

          `                                               -4147.2 kg per dy

Toal GAC needed                           -4147.2 *1000*1000/550mgg-

-7540363.6g

-7540363.6g/ 1000

- 7540.3kg

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