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KMID : 1024519930020040271
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Journal of the Environmental Sciences
1993 Volume.2 No. 4 p.271 ~ p.278
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Biodegradation Kinetics of Nonylphenol Ethoxylates by Pseudomonas sp.
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Kim Su-Jeong
Lee Jong-Kun
Lee Sang-Joon
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Abstract
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Optimal biodegradation kinetics models to the initial nonylphenol ethoxylates-30 concentration were investigated and had been fitted by the linear regression. Microorganisms capable of degrading nonylphenol ethoxylates-30 were isolated from sewage near Ulsan plant area by enrichment culture technique. Among them, the strain designated as EL-10K had the highest biodegradability and was identified as Pseudomonas from results of taxonomical studies. The optimal conditions for the biodegradation were 1.0 g/ι of nonylphenol ethoxylates-30 and 0.02 g/ι of ammonium nitrate at pH 7.0 and 3. The highest degradation rate of nonylphenol ethoxylates-30 was about 89% for 30 hours incubation on the optimal condition. Biodegradation data were fit by linear regression to equations for 3 kinetic models. The kinetics of biodegradation of nonylphenol ethoxylates was best described by first order model for 0.1 /ι nonylphenol ethoxylates-30 ; by Monod no growth model and Monod with growth model for 0.5 /mι and 1.0, 5.0 /mι, respectively.
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KEYWORD
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Nonylphenol ethoxylates-30, Pseudomonas sp., Monod and first order kinetic models
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