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Bioisomerization kinetics of γ-HCH and biokinetics of Pseudomonas aeruginosa degrading technical HCH

Paper ID Volume ID Publish Year Pages File Format Full-Text
4857 251 2007 8 PDF Available
Title
Bioisomerization kinetics of γ-HCH and biokinetics of Pseudomonas aeruginosa degrading technical HCH
Abstract

Bioconversion kinetics of γ-HCH and biological growth kinetics of Pseudomonas aeruginosa degrading technical HCH was investigated in flask experiments under aerobic condition. Degradation studies for various isomers of technical HCH were also performed. The biodegradation of the most persistent β-HCH and δ-HCH isomers was also observed. At lower technical HCH concentrations (1–10 mg/l), above 99% of the degradation was observed whereas at higher concentration (20–50 mg/l), the degradation efficiency was dropped. This may be due to inhibitory effect of technical HCH at higher concentrations. The technical HCH inhibitory behavior and bacterial growth kinetics could be correlated well by simple Haldane's growth kinetic model. The value of decay and yield coefficient was also determined.Further experimental results also revealed that degradation of the γ-HCH isomer is faster (after incubation of 5 days) in the presence of other isomers of technical HCH, whereas γ-HCH alone does not degrade even after a long period of incubation (14 days), but isomerizes to α-HCH isomer by the P. aeruginosa. The rate constant for the bioisomerization was found to be 0.0474 day−1. The above estimated parameters (maximum specific growth rate, half saturation coefficient, inhibition constant, decay coefficient, yield coefficient and bioisomerization rate) are invariably required for the design and simulation of batch and continuous bioreactors treating HCH containing wastewaters.

Keywords
Biokinetics; Bioisomerization; Biodegradation; Treatment; Isomers; Hexachlorocyclohexane (HCH); Haldane's model; Monod's model
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 35, Issue 1, 1 July 2007, Pages 12–19
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