Effect of nonionic surfactants on naphthalene dissolution and biodegradation.
The effect of six nonionic surfactants, Igepal CA-720, Tergitol NPX, Triton X-100, PLE4, PLE10, and PLE23, on the dissolution rate of solid naphthalene was studied in stirred batch reactors. Results showed increased mass-transfer rates with increased surfactant concentrations up to 10 kg m-3. Dissolution experiments were adequatly described by a mechanistic mass-transfer model. Partitioning of naphthalene into the micelles and the diffusion coefficients of the micelles affected the dissolution rate most significantly. Combined dissolution and biodegradation experiments with Triton X-100 or PLE10 with naphthalene showed that the biomass-formation rate of Pseudomonas 8909N (DSM No. 11634) increased concomitantly with the mass-transfer rate under naphthalene-dissolution limited conditions up to surfactant concentrations of 6 kg m-3.
Mulder
H
H
Laboratory for Ecotoxicology, National Institute of Public Health and the Environment, P.O. Box 1, 3720 BA Bilthoven, The Netherlands. eric.mulder@rivm.nl
Wassink
G R
GR
Breure
A M
AM
van Andel
J G
JG
Rulkens
W H
WH
D001673:Biodegradation, Environmental; D007700:Kinetics; D009281:Naphthalenes / Q000378:metabolism*; D017830:Octoxynol / Q000494:pharmacology; D011060:Poloxalene / Q000494:pharmacology; D011092:Polyethylene Glycols / Q000494:pharmacology; D011549:Pseudomonas / Q000187:drug effects / Q000378:metabolism; D012995:Solubility; D013501:Surface-Active Agents / Q000494:pharmacology*; D013696:Temperature
D009281:Naphthalenes; D013501:Surface-Active Agents; C031721:naphthalene; D011092:Polyethylene Glycols; C094324:Igepal CA 720; D017830:Octoxynol; D011060:Poloxalene