Control Technology for Polycyclic Aromatic Compounds- Enhancement of Solubilization by Sur face Active Compounds
Date Issued
1999-07-31
Date
1999-07-31
Author(s)
DOI
882211E002029
Abstract
Surfactants have been known to be able
to enhance the solubility of non-polar
compounds and been applied to soil washing,
NAPLs treatments, and so on. This is the first
time for surfactants to be applied to air
pollution control by using surfactant in this
study. The CMC values at differenttemperatures and the solubilization of vapor
phase naphthalene were measured. The
results indicate that the surfactant molecules
disfavor to form micelles at higher
temperature in the range of 25℃~ 50℃.
Rasing pH will lead to a lower CMC by
adding NaOH, especially at pH=11. No
matter quiescent or agitated solution, the
PAHs absorption rate increase obviously only
above CMC. The absorption equilibrium
concentrations increase linearly in proportion
to surfactant concentrations above CMC. The
pH effects on absorption rate and equilibrium
concentration is small. Agitation can increase
the gas absorption rate and lumped mass
transfer coefficient. All the lumped mass
transfer coefficient decrease with surfactant
concentration due to the increase of
interfacial resistance, viscosity and the
decrease of spherical micelle diffusion
coefficient. Because the solubilization effect
of micelles is greater than mass transfer
coefficient reduction effect above CMC, the
total net absorption rate increases. Both high
pH and high speed of agitation can facilitate
the mass transfer of naphthalene from gas
phase into liquid. The solubility of vapor
phase naphthalene can be expressed by a
enhancement factor (En). The naphthalene
enhancement factor of surfactant solution at
0.1 M and stir at 270 rpm relative to pure
water quiescence absorption can reach 18.60.
This study confirm that the ionic surfactant
can increase removal efficiency of
hydrophobic organic compounds from gas
phase.
Subjects
polycyclic aromatic compounds
surfactant
solubilization
critical micelle
concentration
concentration
enhancement factor
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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