DocumentCode :
3145377
Title :
Sorption Isotherm of Rhamnolipids onto Sediment: Effect of Different Rhamnolipidic Type and Sediment Properties
Author :
Guo, Yan-Ping ; Hu, Yong-you ; Lin, Hui ; Dai, Jia-Ning ; Zhang, Xiao-Yu
Author_Institution :
Minist. of Educ. Key Lab. of Pollution Control & Ecological Remediation for Ind. Agglomeration Area, South China Univ. of Technol., Guangzhou, China
fYear :
2010
fDate :
18-20 June 2010
Firstpage :
1
Lastpage :
4
Abstract :
Microbe produced rhamnolipids are often mixtures containing multicomponent homologues. To understanding the rhamnolipid sorption affected by its homologue compositions is of considerable importance to its application for environmental restorations, including rhamnolipids pump-and-treat for polluted groundwater, rhamnolipids flushing to mobilize hydrophobic contaminants, as well as effects of contaminants transfer from solid to aqueous phases by such biosurfactants. In this study, the adsorption of two representative rhamnolipidic homologue fractions, RL-F1 and RL-F2, which were separated and purified from the crude extracts by Pseudomonas aeruginosa mutant strain MIG-N146, onto three sediments was comparatively investigated. Application of the Langmuir and multi-interaction isotherm models indicates that the rhamnolipidic type and the degree of their hydrophobicity created predominant influences on adsorbability. The rhamnolipid adsorption behaviors showed larger tendency to be the S-shaped multi-interaction sorption isotherm, which was mostly driven by hydrophobic interactions between the rhamnolipidic molecules. RL-F1 fraction exhibited generally much higher adsorption plateaus than that for RL-F2. It was also found that the organic carbon and clay contents were important sediment-parameters affecting sorption. These results giving insight into the sorption behavior influenced by different rhamnolipidic type and sediment properties may provide useful information for rhamnolipid application in environmental remediations.
Keywords :
adsorption; decontamination; environmental factors; hydrophobicity; industrial pollution; sediments; soil; soil pollution; Langmuir isotherm models; MIG-N146; Pseudomonas aeruginosa; RL-F1 fraction; adsorbability; adsorption; biosurfactants; chemically polluted site remediation; hydrophobic contaminants; hydrophobic organic contaminants removal; hydrophobicity; multiinteraction isotherm models; rhamnolipids; sediment; sorption isotherm; Biological materials; Capacitive sensors; Carbon dioxide; Control engineering education; Educational technology; Industrial control; Pollution control; Rivers; Sediments; Solids;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Bioinformatics and Biomedical Engineering (iCBBE), 2010 4th International Conference on
Conference_Location :
Chengdu
ISSN :
2151-7614
Print_ISBN :
978-1-4244-4712-1
Electronic_ISBN :
2151-7614
Type :
conf
DOI :
10.1109/ICBBE.2010.5517702
Filename :
5517702
Link To Document :
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