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ID 20582
file
creator
Alcantara-Garduno, Martha E.
Suzuki, Masahiro
Matsui, Chikara
Kose, Tomohiro
Okada, Mitsumasa
subject
n-dodecane
remediation
support media
surfactant
temperature
NDC
Earth sciences. Geology
abstract
Techniques for enhancing the biodegradation of oil-contaminated fine soils in a slurry-phase bioreactor were investigated. Using a model system consisting of kaolin particles containing adsorbed n-dodecane as a diesel fuel surrogate, we investigated how increasing the temperature and adding a surfactant and various hydrophobic support media affected the biodegradation rate of n-dodecane. Increasing the temperature from 25 to 35°C decreased the time required for complete degradation of n-dodecane by 30%, from 110 h to 80 h. Addition of the surfactant polyethylene glycol p-1,1,3,3-tetramethylbutylphenyl ether decreased the degradation time to less than 48 h at 35°C, although a high concentration of the surfactant (3000 mg l-1) was required. We suspect that the surfactant increased the degradation rate by solubilizing the n-dodecane into the solution phase in which the microorganisms were suspended. We tested five types of organic polymers as support media for the microorganisms and found that the biodegradation time could be reduced by approximately 50% with a support medium made from polyurethane; in the presence of this medium, only 36 h was required for complete decomposition at 35°C. The reduction in the degradation time was probably due to transfer of the n-dodecane from the soil to the support medium, which improved contact between the n-dodecane and the microorganisms. The polyurethane support medium bearing the microorganisms was stable and could be reused.
journal title
Chemosphere
volume
Volume 68
issue
Issue 2
start page
281
end page
286
date of issued
2007-06
publisher
Pergamon-Elsevier Science Ltd.
issn
0045-6535
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2007 Elsevier Ltd
relation url
department
Graduate School of Engineering
Institute for Waste Waters Treatment



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