Biodegradation of polyethylene terephthalate waste using Streptomyces species and kinetic modeling of the process

Farzi, Ali; Dehnad, Alireza; Fotouhi, Afsaneh F.

doi:10.1016/j.bcab.2018.11.002

Cited by 99 publications

(78 citation statements)

References 17 publications

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“…In one study, Farzi et al (2019) assessed the biodegradation of PET by Streptomyces species in conjunction with a mechanical strategy. PET waste, in the form of bottles, was ground down to a powder form prior to the bacterial treatment, which comprised of 18 days incubation in a culture medium at 28 • C. Powdered PET was separated by particle size (500, 420, 300, and 212 µm) with 50 mg samples of each size undergoing treatment.…”

Section: Biological Recyclingmentioning

confidence: 99%

“…Given the time and variables associated with cultivating and maintaining microorganisms as well as extracting their enzymes and allowing the degradation reaction to proceed, biological recycling is relatively slow when compared with chemical or mechanical methods. Therefore, bio-recycling must currently be carried out in combination with at least one of these other approaches ( Koshti et al, 2018 ; Farzi et al, 2019 ).…”

Section: Future Perspectivesmentioning

confidence: 99%

“…While it was shown that degradation of the film surface did occur, results were not significant, particularly when compared to the powdered samples. It was evident from this lab-scale assessment that a mechanical powdering treatment can be very effective, giving high degradation efficiency ( Farzi et al, 2019 ).…”

Section: Future Perspectivesmentioning

confidence: 99%

See 2 more Smart Citations

Microbial Polyethylene Terephthalate Hydrolases: Current and Future Perspectives

2020

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Plastic has rapidly transformed our world, with many aspects of human life now relying on a variety of plastic materials. Biological plastic degradation, which employs microorganisms and their degradative enzymes, has emerged as one way to address the unforeseen consequences of the waste streams that have resulted from mass plastic production. The focus of this review is microbial hydrolase enzymes which have been found to act on polyethylene terephthalate (PET) plastic. The best characterized examples are discussed together with the use of genomic and protein engineering technologies to obtain PET hydrolase enzymes for different applications. In addition, the obstacles which are currently limiting the development of efficient PET bioprocessing are presented. By continuing to study the possible mechanisms and the structural elements of key enzymes involved in microbial PET hydrolysis, and by assessing the ability of PET hydrolase enzymes to work under practical conditions, this research will help inform large-scale waste management operations. Finally, the contribution of microbial PET hydrolases in creating a potential circular PET economy will be explored. This review combines the current knowledge on enzymatic PET processing with proposed strategies for optimization and use, to help clarify the next steps in addressing pollution by PET and other plastics.

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Section: Biological Recyclingmentioning

confidence: 99%

Section: Future Perspectivesmentioning

confidence: 99%

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Microbial Polyethylene Terephthalate Hydrolases: Current and Future Perspectives

2020

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“…Furthermore, PET contains two hydroxyl (OH) groups and dicarboxylic aromatic acid, which comprises a large, six-sided carbon (or aromatic) ring and two carboxyl (CO 2 H) groups. Under heat and catalysts, the hydroxyl and carboxyl groups will react to form ester (CO-O) (Venkatachalam et al, 2012;Farzi et al, 2019). The presence of a large aromatic ring in PET makes it stiff, strong, tough, hydrolytic, solvent resistant (Venkatachalam et al, 2012) and hygroscopic (Ma and Buhshan, 2003; CWC Best Practices in PET Recycling, 1997).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Interaction Among Microalgae Spirulina sp, Plastics Polyethylene Terephthalate and Polypropylene in Freshwater Environment

Khoironi¹,

Anggoro²,

Sudarno³

2019

J. Ecol. Eng.

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The annual plastic production in Indonesia has exceeded 4.6 million tons and accumulated in the aquatic system. Polyethylene terephthalate (PET) and Polypropylene (PP) are the most widely used plastics in manufacture of packaging, fibres, and drinking bottles, etc. The degradation of these plastics to micro sizes leads to environmental threats, especially when the micro plastics interact with fresh water microorganism such as microalgae. Therefore, the study on the interaction between micro plastics and microorganisms is really important. The aim of this study was to evaluate the impact of microplastics on the growth of microalgae Spirulina sp and also to evaluate the contribution of microalgae Spirulina sp to the plastic degradation. The interaction between microalgae and microplastics was evaluated in a 1 L glass bioreactor contained microalgae Spirulina sp and PP and PET microplastics with the size of 1 mm at various concentrations (150 mg/500 mL, 250/500 mL and 275 mg/500 mL) for 112 days. The results showed that the tensile strength of micro plastic PET decreased by 0.9939 MPa/day while PP decreased by 0.1977 MPa/day. The EDX analysis of microplastics showed that the decreasing carbon in PET (48.61%) was higher as compared to PP (36.7%). FTIR analysis of Spirulina sp cells showed that the CO 2 evolution of cells imposed by PET microplastic was higher than imposed by PP. The growth rate of Spirulina sp applied by micro plastic was lower than the control and the increase of microplastic concentration significantly reduced the growth rate of algae by 75%. This research concluded that biodegradation has important role in the degradation process of plastic.

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“…The structure of the analyzed materials played a crucial role during biodegradation. In the work of Farzi et al [ 79 ] it was proved that the biodegradation of PET in the form of powder was more efficient.…”

Section: Discussionmentioning

confidence: 99%

Comparative Study of Structural Changes of Polylactide and Poly(ethylene terephthalate) in the Presence of Trichoderma viride

Dąbrowska

Garstecka

Olewnik-Kruszkowska

et al. 2021

IJMS

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Plastic pollution is one of the crucial global challenges nowadays, and biodegradation is a promising approach to manage plastic waste in an environment-friendly and cost-effective way. In this study we identified the strain of fungus Trichoderma viride GZ1, which was characterized by particularly high pectinolytic activity. Using differential scanning calorimetry, Fourier-transform infrared spectroscopy techniques, and viscosity measurements we showed that three-month incubation of polylactide and polyethylene terephthalate in the presence of the fungus lead to significant changes of the surface of polylactide. Further, to gain insight into molecular mechanisms underneath the biodegradation process, western blot hybridization was used to show that in the presence of poly(ethylene terephthalate) (PET) in laboratory conditions the fungus produced hydrophobin proteins. The mycelium adhered to the plastic surface, which was confirmed by scanning electron microscopy, possibly due to the presence of hydrophobins. Further, using atomic force microscopy we demonstrated for the first time the formation of hydrophobin film on the surface of aliphatic polylactide (PLA) and PET by T. viride GZ1. This is the first stage of research that will be continued under environmental conditions, potentially leading to a practical application.

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Biodegradation of polyethylene terephthalate waste using Streptomyces species and kinetic modeling of the process

Cited by 99 publications

References 17 publications

Microbial Polyethylene Terephthalate Hydrolases: Current and Future Perspectives

Microbial Polyethylene Terephthalate Hydrolases: Current and Future Perspectives

Evaluation of the Interaction Among Microalgae Spirulina sp, Plastics Polyethylene Terephthalate and Polypropylene in Freshwater Environment

Comparative Study of Structural Changes of Polylactide and Poly(ethylene terephthalate) in the Presence of Trichoderma viride

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