Multisubstrate monod kinetic model for simultaneous degradation of chlorophenol mixtures

Durruty, Ignacio; Okada, Elena; Gonzalez, Jorge Froilán; Murialdo, Silvia Elena

doi:10.1007/s12257-010-0418-z

Cited by 30 publications

(38 citation statements)

References 27 publications

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“…The substrate to biomass yield coefficients based on total CP degradation are also shown in Table 1. These values are higher than those previously reported by Durruty et al (2011) for the same strain and acclimated condition, exposed to similar CP concentrations but with lower biomass concentration. These results support the observation of Moreno-Andrade and Buitrón (2003), who observed that growth inhibition is not only a function of the initial substrate concentration, but also of the initial biomass concentration.…”

Section: Resultscontrasting

confidence: 76%

“…The effect of a secondary chlorophenol on the removal of another chlorophenol present in the mixture has been investigated using batch Tobajas et al, 2010) and fed-batch systems (Quan et al, 2005;De Los CobosVasconcelos et al, 2006). In previous work (Durruty et al, 2011), it has been demonstrated that the presence of 2,4,6-TCP …”

Section: Introductionmentioning

confidence: 90%

“…Before inoculations, all media were adjusted to pH 7 and autoclaved at 121ºC for 15 min. The bacteria were acclimated as described in Durruty et al (2011).…”

Section: Microorganisms and Culture Conditionsmentioning

confidence: 99%

“…CPs have been used extensively for the synthesis of many kinds of compounds such as pesticides, herbicides and dyes. Thus, CPs are found in various industrial and municipal wastes (Ozkaya, 2005;Majumder and Gupta, 2007;Tzou et al, 2008) and several wastewaters contain PCP, present in mixtures together with other CPs and aromatic compounds (Majumder and Gupta, 2007;Durruty et al, 2011). The degradation rate of one or more compounds may be altered when they occur within a mixture of toxic compounds: the rate may be stimulated, inhibited or decreased (Abuhamed et al, 2004;Baggi et al, 2004;Liu et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Degradation of chlorophenol mixtures in a fed-batch system by two soil bacteria

Durruty¹,

Okada²,

Gonzalez³

et al. 2011

WSA

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This work was undertaken to investigate the effect of variations of the feed rate on a fed-batch set-up used to degrade xenobiotics. The mixture of substrates was composed of PCP, 2,4,6 TCP and 2,3,5,6 TeCP (pentachlorophenol, 2,4,6 trichlorophenol and 2,3,5,6 tetrachlorophenol respectively). Two acclimated bacteria isolated from soil were used: Pseudomonas aeruginosa and Achromobacter sp. nov. The different flow rates tested were: I: 0.5 mℓ•min . Our results show that during fed-batch operation the 2,4,6 TCP exhibits an earlier degradation than the other compounds, for all of the flow rates tested. This indicates that in this case the degradation of the most recalcitrant compounds (PCP and 2,3,5,6 TeCP) is benefited by the increase in biomass of bacteria, due to the metabolisation of a less recalcitrant compound (2,4,6 TCP). The defined parameter, specific degradation rate (SDR), was demonstrated to be very useful for comparing the degradation abilities at different flow rates of a fed-batch system. The degradation efficiencies were shown to be higher than 90% for all of the cases and to decrease as the feed rate increases. However, the SDR, a parameter that involves the rate of degradation and the biomass, increases as the flow rate increases. At a feed flow rate of 2 mℓ•min -1 SDR reaches a maximum of 12.476 x 10 -10 mgCP•h -1•CFU -1. Finally, among the feed flows tested, taking into account both the degradation efficiency and the SDR, 2 mℓ•min -1 is the most convenient flow rate for chlorophenol degradation in fed-batch systems. An even higher degradation efficiency (97%) can be achieved by using the feed rate of 2 mℓ•min -1 followed by an additional batch post-treatment of 2 h, with a SDR of 13.136 x 10 -10 mg CP•h -1•CFU -1.

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Section: Resultscontrasting

confidence: 76%

Section: Introductionmentioning

confidence: 90%

“…Before inoculations, all media were adjusted to pH 7 and autoclaved at 121ºC for 15 min. The bacteria were acclimated as described in Durruty et al (2011).…”

Section: Microorganisms and Culture Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Degradation of chlorophenol mixtures in a fed-batch system by two soil bacteria

Durruty¹,

Okada²,

Gonzalez³

et al. 2011

WSA

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“…used in this study was isolated from soil and capable of degrading chlorophenols (Murialdo et al, 2003;Wolski et al, 2006;Durruty et al, 2011aDurruty et al, , 2011b. Microorganisms were stored and grew as detailed in a previews work (Nisenbaum et al, 2013).…”

Section: Bacterial Strains and Growth Mediamentioning

confidence: 99%

Dynamic laser speckle and fuzzy mathematical morphology applied to studies of chemotaxis towards hydrocarbons

Nisenbaum

Bouchet

Guzmán

et al. 2014

IJENVH

Self Cite

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Abstract:The movement of the microorganisms towards a higher concentration of the chemical attractant is called positive chemotaxis and is involved in the efficiency of chemical degradation. Several studies are focused in this field related to genomics, and towards demonstrating chemotactic responses by bacteria, but there is little information related to the activity and morphology of their response. In this work, we use a recently reported dynamic speckle laser method, to process images and to distinguish motile surface patterns per area of colonisation by applying image processing techniques called fuzzy mathematical morphology (FMM). The images of bacterial colonies are usually surfaced, with vague edges and non-homogeneous grey levels. Hence, conventional image processing methods for shape analysis cannot be applied in these cases. In this paper, we propose the application FMM to solve this problem. The approach given was effective to segment, detect and also to describe colonisation patterns. 60M. Nisenbaum et al.

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Biodegradation and Co‐Metabolism of Monochlorophenols and 2,4‐Dichlorophenol by Microbial Consortium

Patel

Kumar

2017

CLEAN Soil Air Water

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In the present study, biodegradation of monochlorophenols (MCPs) and their co‐metabolism with 2,4‐dichlorophenol (2,4‐DCP) using mixed microbial consortium has been reported. The mixed consortium has shown 44 to 100% degradation of 50 to 300 mg L–1 3‐chlorophenol (3‐CP). While in case of 4‐CP, the degradation observed was 46 to 100% of 100 to 600 mg L−1 of initial concentrations. HPLC and spectrophotometric analysis indicated that the degradation occurred via a meta‐cleavage pathway. 4‐Chlorocatechol was observed as a common intermediate for both 3‐CP and 4‐CP degradation pathways. The transformation of 4‐chlorocatechol to maleylacetate via 5‐chloro 2‐hydroxymuconic semialdehyde indicated the complete degradation of both 3‐CP and 4‐CP. The co‐metabolic study of 2,4‐DCP in the presence of MCPs showed that the degradation of 2,4‐DCP increases in the presence of 3‐CP and 4‐CP. The biodegradation (mg L−1 per day) in the quaternary mixture of MCPs and DCP occurred in the order of 3‐CP > 4‐CP > DCP > 2‐CP. The biodegradation kinetics constants obtained for 3‐CP were Rm = 1.96 mg L−1 h−1, Ks = 47.23 mg L−1, Ki = 104.12 mg L−1, and for 4‐CP were Rm = 6.33 mg L−1 h−1, Ks = 1262 mg L−1, Ki = 1408.8 mg L−1 by Andrew's substrate inhibition model using MATLAB 6.5.

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Multisubstrate monod kinetic model for simultaneous degradation of chlorophenol mixtures

Cited by 30 publications

References 27 publications

Degradation of chlorophenol mixtures in a fed-batch system by two soil bacteria

Degradation of chlorophenol mixtures in a fed-batch system by two soil bacteria

Dynamic laser speckle and fuzzy mathematical morphology applied to studies of chemotaxis towards hydrocarbons

Biodegradation and Co‐Metabolism of Monochlorophenols and 2,4‐Dichlorophenol by Microbial Consortium

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