Page 231 - Materials Chemistry, Second Edition

214 Practical Design Calculations for Groundwater and Soil Remediation

1 + 0.3τ = 30
So, τ = 97 min = 1.61 h

(b) Assuming the bulk density of soil in the reactor is 1.8 g/cm , the
3
volumetric feeding rate of the soil can be found as:

Q soil = (500 kg/h) ÷ 1.8 kg/L = 278 L/h

The minimum reactor size can be found from the definition of
the retention time as:

τ = V/Q = 1.61 h = V/(278 L/h)

So, V = 447 L
With the soil occupying less than 30% of the total reactor volume,
the required reactor volume (V reactor ) can be found as

V reactor = (447) ÷ 30% = 1,490 L = 394 gal

References

1. Johnson, P.C., and R.A. Ettinger. 1994. Considerations for the design of in
situ vapor extraction systems: Radius of influence vs. zone of remediation.
Groundwater Monitoring and Remediation 14 (3): 123–28.
2. Johnson, P.C., M.W. Kemblowski, and J.D. Colthart. 1990. Qualitative analy-
sis for the cleanup of hydrocarbon-contaminated soils by in situ soil venting.
Groundwater 28 (3): 413–29.
3. Johnson, P.C., C.C. Stanley, M.W. Kemblowski, D.L. Byers, and J.D. Colthart.
1990. A practical approach to the design, operation, and monitoring of in situ
soil-venting systems. Groundwater Monitoring and Remediation 10 (2): 159–78.
4. Kuo, J.F., E.M. Aieta, and P.H. Yang. 1991. Three-dimensional soil venting
model and its applications. In Emerging technologies in hazardous waste manage-
ment II, ed. D.W. Tedder and F.G. Pohland, 382–400. American Chemical Society
Symposium Series 468. Washington, DC: ACS.
5. Peters, M.S., and K.D. Timmerhaus. 1991. Plant design and economics for chemical
engineers. 4th ed. New York: McGraw-Hill.
6. USEPA. 1991. Site characterization for subsurface remediation.
EPA/625/R-91/026. Washington, DC: Office of Research and Development, US
EPA.