Multi-substrate biodegradation of chlorophenols by defined microbial consortium

Patel, Bhishma P.; Kumar, Arvind

doi:10.1007/s13205-016-0511-x

Cited by 17 publications

(4 citation statements)

References 40 publications

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“…Chlorophenols (CPs) are aromatic ring structures containing at least one chlorine atom (−Cl) and one hydroxyl (−OH) group at the benzene rings. They are ubiquitous contaminants in the environment [8][9][10]. Their thermal, biological and chemical degradation is responsible for the release of harmful metabolites which constitute public health problems.…”

Section: Introductionmentioning

confidence: 99%

Toxicity of Quaternary Mixture of Formulated Glyphosate and Phenols on Providencia vermicola Dehydrogenase Activity

Okafor

Michael

Nweke

et al. 2021

ACRI

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Aims: To assess the toxicity of glyphosate (as an active ingredient in drysate), three phenols (2,4-dichlorophenol, 4-chlorophenols and phenol) and quaternary mixtures of glyphosate, 2,4-dichlorophenol, 4-chlorophenol and phenol on the dehydrogenase activity (DHA) of P. vermicola. Study Design: The glyphosate, 2,4-dichlorophenol, 4-chlorophenol and phenol mixture ratios (%) were designed as: 25%:25%:25%:25%; 30%:20%:20%:30%, 40%:10%:10%: 40%; 50%:5%:30%:15% and 20%:20%:10%:50% for the respective mixtures in the concentration range of 0-1000 mg/L. Place and Duration of Study: Silver Press Laboratory, Owerri Nigeria between July, 2016 and August, 2019. Methodology:A laboratory scale study was carried on four toxicants using dehydrogenase inhibition test. The inhibition of dehydrogenase activity of the isolate by toxicant was calculated relative to the control. The percentage inhibition data generated was fitted into a logistic dose response model and Weibulleum to obtain their respective IC50. Results:The results revealed that the median inhibitory concentrations (IC50) of the mixtures on the Providencia vermicola were 247.17 ±10.20, 163.44 ± 8.18, 251.33 ± 45.25, 267.30 ± 8.76 and 178.93 ± 45.53 mg/L, respectively. Toxicity index (TI) model was used to evaluate the joint action toxicity of the mixtures on the test organism and was 60 % antagonistic. Conclusion: Thus, these synergistic and additive interactions of formulated glyphosate with the intermediates of 2,4-D was possible against the dehydrogenase activity of Providenciavermicola an important plant growth promoting bacterium. The dynamics of the toxic effects thus would depend on the concentration of the compounds.

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Section: Introductionmentioning

confidence: 99%

Toxicity of Quaternary Mixture of Formulated Glyphosate and Phenols on Providencia vermicola Dehydrogenase Activity

Okafor

Michael

Nweke

et al. 2021

ACRI

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“…4 However, these processes involve high operating cost with secondary waste generated. 5,6 Thus, biodegradation process involving the elimination of the pollutants by the metabolic activities of living microorganisms can serve as an alternative to remove such compounds. 7 This process is eco-friendly and energy-efficient with achievable complete mineralisation of chlorophenols.…”

Section: Introductionmentioning

confidence: 99%

“…15,16 The commonly used co-substrates are peptone, glucose and yeast extract. 5,6 In the study by Loh and Tan, the enhancement of phenol biodegradation rate by yeast extract as co-substrate was dependent on the yeast extract concentration. 6 To the best of our knowledge, the studies of interaction effects of co-substrate and 4-CP at various concentrations on the biodegradation performance are still limited.…”

Section: Introductionmentioning

confidence: 99%

Studies of the Effects of Co-substrates on Biodegradation Kinetics of 4-Chlorophenol Using Response Surface Methodology (RSM)

Halim¹,

Peng²,

Ling³

2019

JPS

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This study aimed to investigate the effect of glucose or sucrose as cosubstrate on the kinetics of 4-chlorophenol (4-CP) biodegradation by 4-CP-acclimated activated sludge. The performance of 4-CP biodegradation was enhanced in the presence of co-substrate with greater values of zero-order rate constant observed for sucrose compared to glucose at higher 4-CP concentration. The interaction effects of two factors, namely initial 4-CP and co-substrate concentrations ranging from 100-500 mg l -1 and 0-1000 mg l -1 , respectively, on the biodegradation kinetics were examined by using response surface methodology (RSM). For glucose, the kinetics was found dependent on the 4-CP initial concentration. The optimised condition for 4-CP biodegradation in the presence of glucose was: 200 mg l -1 4-CP and 750 mg l -1 glucose with rate constant of 7.630 mg l -1 h -1 .

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“…In addition, substrate-level metabolism of biogenic substrate may also bring NADH enrichment, which can be resourceful for ATP formation. Previous studies have shown that the biodegradation rate of some xenobiotics can be enhanced by adding biogenic organics such as glucose and peptone on pentachlorophenol degradation [8]. Also, enhancing nutrients such as nitrogen, phosphate, and minerals were found to be beneficial for xenobiotic degradation [9].…”

Section: Introductionmentioning

confidence: 99%

Shortening the Acclimation and Degradation Lag of Xenobiotics by Enriching the Energy Content of Microbial Populations

Nguyen

Chong

Bùi

2018

Pol. J. Environ. Stud.

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We studied shortening the acclimation and enhancement of the degradation rate for a xenobiotic organic pollutant using microbial populations grown in suspension as activated sludge. Soil populations cultivated as raw activated sludge in a steady-state fed-batch reactor and the raw sludge were re-cultured (energy enriched) with biogenic substrates and compared for their performances in acclimation and degradation of 2,4-D. The cells' mass and ATP content were also measured during the 2,4-D acclimation and degradation. The optimal concentration of supplemental biogenic substrate and most suitable time point of re-cultivation that could produce the most shortening of lag phase were determined in a previous study. The purpose of this study was to find the true mechanism of this shortening based on the contents of cell internal ATP. As compared with the raw sludge, the enriched sludge contained a higher amount of energy at the start of acclimation and brought a shortened lag time during the acclimation process. External energy (biogenic substrates's energy) invested into activated sludge cells could improve the microorganisms in acclimation to a xenobiotic by sustaining the energy needed for the difficult xenobiotic metabolism.

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Multi-substrate biodegradation of chlorophenols by defined microbial consortium

Cited by 17 publications

References 40 publications

Toxicity of Quaternary Mixture of Formulated Glyphosate and Phenols on Providencia vermicola Dehydrogenase Activity

Toxicity of Quaternary Mixture of Formulated Glyphosate and Phenols on Providencia vermicola Dehydrogenase Activity

Studies of the Effects of Co-substrates on Biodegradation Kinetics of 4-Chlorophenol Using Response Surface Methodology (RSM)

Shortening the Acclimation and Degradation Lag of Xenobiotics by Enriching the Energy Content of Microbial Populations

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