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Effect of temperature, and surfactant's HLB and dose over the TPH-diesel biodegradation process in aged soils

Paper ID Volume ID Publish Year Pages File Format Full-Text
36662 45139 2005 7 PDF Available
Title
Effect of temperature, and surfactant's HLB and dose over the TPH-diesel biodegradation process in aged soils
Abstract

Aged soils are difficult to treat by biological methods, since contaminants, i.e. hydrocarbon compounds, can be tightly adsorbed into the soil particles. This problem can be solved by using small quantities of specific surfactants to increase the compounds’ bioavailability. Selection of the right surfactant and dose is of crucial importance to the biodegradation process, but frequently the selection process is based on a trial-and-error method. Surfactant's hydrophilic–lipophilic balance (HLB) value is an expression of the surfactant's molecule affinity to the organic and water phases. This parameter can be a helpful tool in the selection of the adequate surfactant. The aim of this work is to clarify the combined effect of temperature, and surfactant HLB and dose effects over TPH-diesel removal in a Mexican aged soil. A statistical design was used in order to minimize the number of experiments needed for achieving that purpose. The results of this work indicate that the parameter that mostly affected the biodegradation process was temperature, followed by the surfactant's HLB value, and surprisingly, surfactant dose at the end. On the other hand, TPH-contaminated soil was microbiologically characterized in order to identify the microflora responsible for the biodegradation process. One Bacillus, two Corynebacterium, and three Micrococcus species were found among the existing Gram-positive bacteria. Enterobacter amnigenus, Enterobacter cloacae, and Pseudomonas sp. were detected among the Gram-negative bacteria.

Keywords
Aged soils; Enhanced biodegradation; Petroleum contaminated soil; HLB; Surfactants
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Effect of temperature, and surfactant's HLB and dose over the TPH-diesel biodegradation process in aged soils
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 40, Issue 10, October 2005, Pages 3296–3302
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us