Biodegradation and phenol tolerance by recycled cells of Candida tropicalis NCIM 3556

Varma, Rita; Gaikwad, Bhaskar G.

doi:10.1016/j.ibiod.2009.01.001

Cited by 26 publications

(13 citation statements)

References 15 publications

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“…This continued improvement in the performance of the biomass upon repeated use has been highlighted by others (Hsieh et al, 2008;El-Naas et al, 2013;Varma and Gaikwad, 2009;Ali et al, 2013). The biodegradation rates were calculated from the slopes of the best fitted straight line, ignoring the initial segment of fast drop in DCP concentration as it is thought to be much influenced by the dilution effect of water release from the PVA gel particles (water accounts for about 90% of the gel mass).…”

Section: Effect Of Initial Dcp Concentrationmentioning

confidence: 88%

Biodegradation of 2, 4 Dichlorophenol

Al-Khalid¹,

El‐Naas²

2017

American Journal of Engineering and Applied Sciences

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Abstract:The present study focuses on the optimization of process parameters of the aerobic biodegradation of 2, 4 Dichlorophenol (2, 4 DCP) by a commercial strain of P. putida immobilized in PVA gel matrix, using design of experiments by Response Surface Methodology (RSM). The degradation rates obtained from these experiments were used to evaluate the effects of the main factors and their interactions during the biodegradation of 2, 4 DCP. An effective quadratic regression model predicting the rate in terms of the main independent variables, namely temperature, initial pH and initial concentration of 2, 4 DCP, was developed. The optimum conditions for DCP degradation were obtained as follows: Temperature 32.6°C, pH 5.0 and initial DCP concentration 70.5 mg L −1 , resulting in a maximum predicted degradation rate of 41.8 mg L. Under these optimized conditions, a degradation rate of 40.1 mg L −1 h −1was experimentally obtained, thus validating the model.

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Section: Effect Of Initial Dcp Concentrationmentioning

confidence: 88%

Biodegradation of 2, 4 Dichlorophenol

Al-Khalid¹,

El‐Naas²

2017

American Journal of Engineering and Applied Sciences

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“…), yeast (Pleurotutus ostreatus, Candida tropicalis, Trichosporon cutaneum and Phanerochaete chrysosporium) and fungi (Fusarium flucciferum and Aspergillus fumigates) can degrade phenol and among algae, Ochromonas danica can degrade phenol (Ariana et al, 2004). Although, there are several report about diverse group of microorganisms belong to several genera for phenol degradation (Kennes and Lema, 1994;Bandyopadhyay et al, 1998;Annadurai et al, 2007;Varma and Gaikwad, 2009;Basak et al, 2014) but there are no published report on Citrobacter sp. for phenol degradation.…”

Section: Metabolic Versatilitymentioning

confidence: 99%

Assessment of phenol biodegradation capacity of indigenous bacteria isolated from sewage treatment plant

Das¹,

Kumar²

2015

Afr. J. Microbiol. Res.

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Among different xenobiotics, phenol is a man made as well as a naturally occurring aromatic compound and an important intermediate in the biodegradation of natural and industrial aromatic compounds. The investigation was undertaken to isolate, characterize and exploit phenol degrading bacteria from sewage treatment plant (STP) (artificial ecosystem having diverse group of bacteria which are adapted to different aromatic pollutant and capable to degrade xenobiotic aromatic organic pollutants). Out of five different phenol degrading bacteria, one potent strain (IS-3) was identified as Citrobacter freundii with maximum degradation capacity of 1000 ppm phenol in three days under in vitro studies. Phenol degradation performance was greatly influenced by different physical factors like incubation temperature, supplemented glucose, nitrogen source, NaCl and pH of the growth medium. The maximum phenol degradation was observed at incubation temperature of 33°C, 7.5 pH of the medium, 0.1 gl -1 of NaCl, 0.25 gl -1 of glucose and 0.25 gl -1 of ammonium sulphate. We report in this study that the identified potential strain (IS-3) can be used for treatment of phenol contaminated waste water maintaining above the mentioned optimum factors for faster degradation of the phenol contaminated industrial effluents.

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“…In this line, reference [30] found, in a spiral packed-bed reactor, that an activated-sludge culture maintained its phenol uptake rate constant up to a 150 mg·L -1 ·h -1 with almost complete phenol conversion. Also, reference [31] found that while C. tropicalis growth is inhibited by increasing phenol concentration, the inhibition rate decreases with phenol concentration. Thus, we can conclude that the bioprocess is more efficient degrading phenol when VPhin is high.…”

Section: Optimization Strategiesmentioning

confidence: 99%

Model-Based Analysis of a Phenol Bio-Oxidation Process by Adhered and Suspended Candida tropicalis

Velasco-Bedrán¹,

Hormiga²,

Santos³

et al. 2013

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Phenol is an important commodity for the chemical industry, used for many processes and deemed to be a major pollutant due to its xenobiotic nature and high toxicity. For the purpose of phenol bioremediation a biotechnological set up consisting of a continuous packed column bioreactor with Candida tropicalis adhered onto activated carbon beads has been previously described. In this work, we show how the integration of available experimental data of such a biotechnological set up into a mathematical model, can lead both to a better comprehension of the underlying physiological mechanisms operating in the cell culture, and to the identification of the system parameters optimum performance. The model so constructed describes the dynamics of phenol uptake and growth rates by the adhered and suspended biomass; the lethality rates; the adhered biomass removal into suspension or adherence onto carbon beads rates and the phenol and biomass (adhered and suspended) concentrations. It also serves to identify different physiological states for the adhered and the suspended biomass; its predictions being verified by comparing with experimental observations. Based on the model description, different optimization strategies are proposed, some of which have been experimentally tested, encompassing changes in bioreactor operation conditions, process development and strain development.

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Biodegradation and phenol tolerance by recycled cells of Candida tropicalis NCIM 3556

Cited by 26 publications

References 15 publications

Biodegradation of 2, 4 Dichlorophenol

Biodegradation of 2, 4 Dichlorophenol

Assessment of phenol biodegradation capacity of indigenous bacteria isolated from sewage treatment plant

Model-Based Analysis of a Phenol Bio-Oxidation Process by Adhered and Suspended Candida tropicalis

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