air_stripper: Design of Packed Column Air Strippers

In iemisc: Irucka Embry's Miscellaneous Functions

Design of Packed Column Air Strippers

Description

Calculates key parameters needed in the design of a packed column air stripper according to the U.S. Army Corps of Engineers Design Guide No. 1110-1-3: Air Stripping Engineering and Design Design Guidelines. Please refer to the Design Guidelines for the governing equations and background information.

'Air stripping is the transferring of volatile components of a liquid into an air stream. It is an environmental engineering technology used for the purification of groundwaters and wastewaters containing volatile compounds.' (Reference: Wikipedia)

Usage

air_stripper(
  Temp,
  pTe,
  contam1,
  Cai,
  Cae,
  contam2,
  cas = NULL,
  Ha,
  Q,
  loading,
  ns,
  DL,
  DG,
  R,
  P_atm = NULL,
  dP = NULL,
  at = NULL,
  Sc = NULL,
  cf = NULL,
  Temp_unit = c("SI", "Eng", "Absolute"),
  dP_unit = c("inch", "mm"),
  at_unit = c("ft^2/ft^3", "m^2/m^3"),
  Sc_unit = c("kg/s^2", "slug/s^2"),
  contaminants_table = c(0, 1),
  removal_requirements_table = c(0, 1),
  critical_contaminant_table = c(0, 1)
)

Arguments

Temp	numeric vector that contains the minimum Temperature (degrees Celsius, degrees Fahrenheit, or Kelvin)
pTe	numeric vector that contains the total pressure of gas (air) effluent (atm)
contam1	character vector that contains the name of each contaminant to be removed (may include "Total VOCs"). See the example.
Cai	numeric vector that contains the concentration of each contaminant in liquid (water) influent (ug/L)
Cae	numeric vector that contains the concentration of each contaminant in liquid (water) effluent (ug/L)
contam2	character vector that contains the name of each contaminant (will not include "Total VOCs"). See the example.
cas	character vector that contains the CAS Number of each contaminant, if known, otherwise it can be accessed internally
Ha	numeric vector that contains the Ha (Henry's Law coefficient) at the minimum Temperature T for each contaminant (atm/mole/mole)
Q	numeric vector that contains the sustained pumping rate (gallons per minute or gpm)
loading	numeric vector that contains the stripper surface loading (gpm/ft^2)
ns	numeric vector that contains the number of strippers
DL	numeric vector that contains the liquid diffusivity of each contaminant at the minimum Temperature T in the same order as contam2 (m^2/s)
DG	numeric vector that contains the gas diffusivity of each contaminant in air at the minimum Temperature T and pTe in the same order as contam2 (m^2/s)
R	numeric vector that contains the stripping factor (R = 2.5 if air pollution control is required or R = 4.5 if it isn't, but in a range of 2 - 5)
P_atm	numeric vector that contains the atmospheric pressure (atm). The default is 1 atm.
dP	numeric vector that contains the nominal diameters for the packing material. The Design Guidelines use Jaeger Tripacks 2-in. (50.8 mm) plastic media for the packing material.
at	numeric vector that contains the total surface area for the packing material (the default value is 157 m^2/m^3)
Sc	numeric vector that contains the critical surface tension for the packing material (the default value is 0.033 kg/s^2)
cf	numeric vector that contains the packing factor for the packing material (the default value is 15/ft)
Temp_unit	character vector that contains the possible units for the water temperature options are SI for International System of Units, Eng for English units (United States Customary System in the United States and Imperial Units in the United Kingdom), or Absolute for Absolute Units
dP_unit	character vector that contains the possible units for the nominal diameters for the packing material (inch or mm)
at_unit	character vector that contains the possible units for the total surface area for the packing material (ft^2/ft^3 or m^2/m^3)
Sc_unit	character vector that contains the possible units for the critical surface tension for the packing material (kg/s^2 or slug/s^2)
contaminants_table	integer vector that contains 0, 1 only. 0 represents do not print the Contaminants Table and 1 is for printing the Contaminants Table.
removal_requirements_table	integer vector that contains 0, 1 only. 0 represents do not print the Removal Requirements Table and 1 is for printing the Removal Requirements Table.
critical_contaminant_table	integer vector that contains 0, 1 only. 0 represents do not print the Critical Contaminant Table and 1 is for printing the Critical Contaminant Table.

Value

the name of the critical contaminant, molar liquid (water) flow per unit of stripper cross-sectional area (kg mole/m^2 s), molar gas (air) flow per unit of stripper cross-sectional area (kg mole/m^2 s), height of transfer unit (HTU) [m and ft], number of transfer units (NTU), packing depth (m and feet), and the air to water ratio as a data.table. If contaminants_table = 1, provide the Contaminants Table. If removal_requirements_table = 1, provide the Removal Requirements Table. If critical_contaminant_table = 1, provide the Critical Contaminant Table.

Note

Please Note: Use these results as preliminary estimates only.

Please Note: This is not meant for any actual designs.

Please Note: The calculations assume dry air rather than humid air.

Please refer to the iemisc: Air Stripping By Packed Column Examples vignette for examples

Author(s)

Irucka Embry

References

1. Accu Dyne Test: Diversified Enterprises. Critical Surface Tension and Contact Angle with Water for Various Polymers, https://www.accudynetest.com/polytable_03.html.

2. Design Guide No. 1110-1-3: Air Stripping Engineering and Design Appendix D: Example Air Stripping By Packed Column, Department Of The Army U.S. Army Corps of Engineers, 31 October 2001, pages D-1 - D-18, https://www.publications.usace.army.mil/Portals/76/Publications/EngineerDesignGuides/DG_1110-1-3.pdf?ver=2013-08-16-101222-003.

3. Edgar L Andreas, Design Guide No. 1110-1-3: Handbook of Physical Constants and Functions for Use in Atmospheric Boundary Layer Studies, Department Of The Army U.S. Army Corps of Engineers, October 2005, pages D-1 - D-18, https://apps.dtic.mil/sti/pdfs/ADA440352.pdf.

4. EnggCyclopedia. Tutorial: air density calculation, 3 January 2022, https://enggcyclopedia.com/2019/04/air-density-calculation/.

5. Harlan H. Bengtson, PhD, P.E. Continuing Education and Development, Inc., Calculation of Gas Density and Viscosity Course No: H02-008, https://www.scribd.com/document/452763833/Calculation-of-Gas-Density-and-Viscosity-pdf.

6. PCA Series Packed Column Air Strippers, H2K Technologies, Inc., 2011, page 2, http://www.h2ktech.com/pdf_downloads/PCA_Packed_Column_Air_Strippers.pdf.

7. Peter J. Mohr, David B. Newell, and Barry N. Taylor. Continuing Education and Development, Inc., CODATA recommended values of the fundamental physical constants: 2014, Reviews Of Modern Physics, Volume 88, July-September 2016, https://physics.nist.gov/cuu/pdf/CODATA_JPCRD2016.pdf.

8. The NIST Reference on Constants, Units, and Uncertainty, Fundamental Constants Data Center of the NIST Physical Measurement Laboratory, "standard acceleration of gravity g_n", https://physics.nist.gov/cgi-bin/cuu/Value?gn.

9. Wikimedia Foundation, Inc. Wikipedia, 27 March 2022, "Air stripping", https://en.wikipedia.org/wiki/Air_stripping.

iemisc documentation built on Sept. 25, 2023, 5:09 p.m.