Apparent zero-order kinetics of phenol biodegradation by substrate-inhibited microbes at low substrate concentrations

Shishido, Masahiro; Takada, Masayuki

doi:10.1002/(sici)1097-0290(19960620)50:6<709::aid-bit12>3.0.co;2-9

Cited by 19 publications

(4 citation statements)

References 11 publications

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“…The PCP biodegradation with initial concentration up to 10 mg/l was modelled by Monod equation 2, which shows that this concentration is still not an inhibiting one ( Figure 5, Reactor 1). Shishido and co-authors concluded the same in their study (Shishido, 1996). The rate of substrate utilisation k' was determined to be 1.06 d -1 .…”

Section: Modeling Of the Pcp Biodegradationmentioning

confidence: 75%

“…That is why the bioremediation of water and wastewater containing PCP has been a subject of numerous investigations in the last two decades. Despite the profound studies and the results achieved, questions such as choice of the type of biodegradation (anaerobic or aerobic) and adaptation of biomass (Buirton, 1998); determination of the technological and kinetic parameters (Shishido, 1996) and design of the appropriate bioreactors continue to attract the attention of the researchers.…”

Section: Introductionmentioning

confidence: 99%

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Anaerobic sequencing batch reactor as initiating stage in complete pentachlorophenol biodegradation

Ribarova

Topalova

Ivanov

et al. 2002

Water Science and Technology

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Biodegradation of pentachlorophenol (PCP) has been studied in a sequence of two completely mixed reactors. Investigation on the first anaerobic sequencing batch reactor (AnSBR) is discussed in detail in this paper. Key technological and microbiological features were studied: two different types of adaptation process of anaerobic sludge towards PCP detoxication; the influence of the sludge concentration upon the rate of PCP biodegradation; minimum retention time for PCP degradation in dependence on the PCP concentration; modeling of the PCP degradation process; effluent COD and SS concentrations; changes in the micro- and macrostructure of the sludge during acclimatization process.

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Section: Modeling Of the Pcp Biodegradationmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Anaerobic sequencing batch reactor as initiating stage in complete pentachlorophenol biodegradation

Ribarova

Topalova

Ivanov

et al. 2002

Water Science and Technology

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“…For c ≪ c + , the degradation rate nearly follows first-order kinetics (rate is linear in concentration), so that c decays exponentially with time. The most effective of these two regimes for biodegradation should be the zeroth-order regime . However, the zeroth-order rate law by itself would give overly optimistic predictions regarding the time required to reach a particular endpoint concentration.…”

Section: Diffusion-reaction Modelmentioning

confidence: 99%

“…The most effective of these two regimes for biodegradation should be the zeroth-order regime. 15 However, the zeroth-order rate law by itself would give overly optimistic predictions regarding the time required to reach a particular endpoint concentration. The first-order regime with its essentially exponential decay tends to lengthen the time required for a degradative process to achieve a specified contaminant concentration.…”

Section: Diffusion-reaction Modelmentioning

confidence: 99%

Spatial Disorder and Degradation Kinetics in Intrinsic Biodegradation Schemes

et al. 1999

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The restoration of contaminated soils by intrinsic biodegradation employs microorganisms in the subsurface that degrade the contaminant substrate infiltrating the subsurface matrix. The outcome of intrinsic biodegradation has been difficult to predict. We examine a source of the difficulty with a computational model of diffusive-reactive transport that introduces spatial disorder in the arrangement of the degrading microorganisms. Spatial disorder alone, even on the small scales that characterize the distance between aggregates of microorganisms, is enough to induce a wide range of times to complete the degradation to an arbitrary limit. The mean time for the concentration to achieve the limit becomes twice that for the case of spatial order. Bounds on the range of the effective degradation kinetics can be obtained by computing the distribution of times to complete degradation.

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Biodegradation of phenol at high initial concentrations in two-phase partitioning batch and fed-batch bioreactors

Collins

Daugulis

1997

Biotechnol. Bioeng.

103

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A two‐phase organic‐aqueous system was used to degrade phenol in both batch and fed‐batch culture. The solvent, which contained the phenol and partitioned it into the aqueous phase, was systematically selected based on volatility, solubility in the aqueous phase, partition coefficient for phenol, biocompatibility, and cost. The two‐phase partitioning bioreactor used 500 mL of 2‐undecanone loaded with high concentrations of phenol to deliver the xenobiotic to Pseudomonas putida ATCC 11172 in the 1‐L aqueous phase, at subinhibitory levels. The initial concentrations of phenol selected for the aqueous phase were predicted using the experimentally determined partition coefficient for this ternary system of 47.6. This system was initially observed to degrade 4 g of phenol in just over 48 h in batch culture. Further loading of the organic phase in subsequent experiments demonstrated that the system was capable of degrading 10 g of phenol to completion in approximately 72 h. The higher levels of phenol in the system caused a modest increase in the duration of the lag phase, but did not lead to complete inhibition or cell death. The use of a fed‐batch approach allowed the system to ultimately consume 28 g of phenol in approximately 165 h, without experiencing substrate toxicity. In this system, phenol delivery to the aqueous phase is demand based, and is directly related to the metabolic activity of the cells. This system permits high loading of phenol without the corresponding substrate inhibition commonly seen in conventional bioreactors. © 1997 John Wiley & Sons, Inc. Biotechnol Bioeng 55: 155–162, 1997.

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Apparent zero-order kinetics of phenol biodegradation by substrate-inhibited microbes at low substrate concentrations

Cited by 19 publications

References 11 publications

Anaerobic sequencing batch reactor as initiating stage in complete pentachlorophenol biodegradation

Anaerobic sequencing batch reactor as initiating stage in complete pentachlorophenol biodegradation

Spatial Disorder and Degradation Kinetics in Intrinsic Biodegradation Schemes

Biodegradation of phenol at high initial concentrations in two-phase partitioning batch and fed-batch bioreactors

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