Biodegradation of high amounts of phenol, catechol, 2,4-dichlorophenol and 2,6-dimethoxyphenol by Aspergillus awamori cells (original) (raw)
Related papers
Biodegradation of Phenol: A Review
Phenol is one of the organic pollutants in industrial waste water which causes significant environmental problems. Various methods such as chlorination, flocculation, adsorption etc. have been used for the degradation of phenol. But biological methods have proved to be the most effective and economical approach for the removal of phenol and phenol related compounds. Numerous studies on biodegradation of phenol using different types of microorganisms and bioreactors have been reported. Various kinetic models and the effect of various parameters such as initial phenol concentration, temperature, pH, etc. on biodegradation have been also studied.
Biodegradation of Phenol: Mini Review
Journal of Basic and Applied Research in Biomedicine, 2020
This paper is a comprehensive review related to the biological degradation of phenol by microorganisms. The aromatic compound, phenol or hydroxybenzene, is produced industrially or naturally. Many microorganisms that are able to biodegrade phenol have been isolated and at the same time, the metabolic pathways responsible for these metabolic processes have been determined. A large number of bacteria were studied in detail especially, pure cultures as well as the pathways of aerobic phenol metabolism and the enzymes involved. Phenol oxygenation occurred as the initial steps through phenol hydroxylase enzymes leading to formation of catechol, pursued by the splitting of the adjacent ring or in between the two groups of catechol hydroxyls. Thus, the physical and chemical environments plus the chemical structures that affecting biodegradation processes are important determining factors for combating of pollution. This nature of chemical structure for the other aromatic compounds is also a main decisive factor of biodegradability.
Biodegradation of phenol review
Phenol and its derivatives are hazardous pollutants that are highly toxic even at low concentrations. The management of wastewater containing high concentrations of phenols represents major economical and environmental challenges to most industries. Biotechnology has been very effective in dealing with major environmental challenges through utilizing different types of bacteria and biocatalysts to develop innovative processes for the biodegradation, biotreatment, and biosorption of various contaminants and wide range of hazardous materials. Biological treatment has proved to be the most promising and most economical approach for the removal of many organic water pollutants such as phenol. Numerous studies have been published in the literature dealing with the biodegradation of phenols utilizing different types of biomasses and different types of reactors. The authors offer a comprehensive review of the present research on the biodegradation of phenols and presents trends for future research and development, with emphasis on an integrated approach that may be adopted to get synergistically enhanced removal rates and to treat the contaminated effluents in an ecologically favorable process.
Kinetic Parameters of Phenol Biodegradation with Different Microorganisms: A Review
Most industries release wastewater contains high concentrations of phenol which is toxic and contaminating the environment. Biological treatments are preferable for the phenolic compounds treatment. This review aims to investigate the impacts of temperatures, pH, and concentration of substrate on the phenolic compounds biodegradation, to compare the kinetic parameters of different microorganisms, and to discuss the different between the kinetic parameters of aerobic and anaerobic treatment. The review showed that most of the phenol biodegrading bacteria are P. Putida species and mixed cultures but P. Putida has a better adaptation to phenol biodegradation. The values of µ max and K s in anaerobic process are smaller than the values attained in aerobic process. The optimum temperature to acclimatize bacteria to the phenol substrate is 30 ºC while the optimum pH condition is between 6.5 and 7.5. As the phenol concentration was increased, there was an increase in the values of the Ks and even when concentration is low; phenols have a significant inhibitory impact on (μ). The values of Ki for phenol degradation for P. putida species were higher than the values of Ki of mixed cultures. The highest Ki value for the phenol degrading among P.Putida species was 1185.8 mg/L and the highest Ki value among mixed cultures was 648.1 mg/L and the highest Ki value among the other species was 2434.7 mg/L.
Environmental Technology, 2013
The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content. This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden.
Review on Advances in Biodegradation of Phenols: Kinetics, Modelling and Mass Transfer
International journal of research - granthaalayah, 2023
Harmful pollutants like phenol and its derivatives are found in wastewater from a wide range of industries, including oil refining, medicines, coal conversion, chemistry, and petrochemistry. The high concentration, high toxicity, and difficult-to-degrade characteristics of phenols in wastewater pose a serious threat to the environment and to human health. By employing different strains of microorganisms and biocatalysts to create biodegradation procedures of diverse pollutants and a wide spectrum of hazardous compounds, biotechnology has successfully addressed significant environmental challenges. Among various phenols removal techniques, biodegradation is both economical and environmentally friendly. During the study of microbial degradation processes, there is a great deal of interest in the potential for mathematical modelling to forecast microbial growth and degrade harmful or inhibiting environmental pollutants at variable quantities. Such mathematical models are frequently created using aromatic compounds like phenol. The review discusses the following topics: kinetics, modelling, and mass transfer; future scope and directions; diverse microorganisms, bioreactors, the metabolic pathway of phenol, influencing factors, and recent advancements in biological therapy.
Microbial degradation of phenol and phenolic derivatives
2013
Phenol and its derivatives are one of the largest groups of environmental pollutants due to their presence in many industrial effluents and broad application as antibacterial and antifungal agents. A number of microbial species possess enzyme systems that are applicable for the decomposition of various aliphatic and aromatic toxic compounds. Intensive efforts to screen species with high-degradation activity are needed to study their capabilities of degrading phenol and phenolic derivatives. Most of the current research has been directed at the isolation and study of microbial species of potential ecological significance. In this review, some of the best achievements in degrading phenolic compounds by bacteria and yeasts are presented, which draws attention to the high efficiency of strains of Pseudomonas, Candida tropicalis, Trichosporon cutaneum, etc. The unique ability of fungi to maintain their degradation potential under conditions unfavorable for other microorganisms is outstanding. Mathematical models of the microbial biodegradation dynamics of single and mixed aromatic compounds, which direct to the benefit of the processes studied in optimization of modern environmental biotechnology are also presented.