The Microbial Devulcanisation of Waste Ground Tyre Rubber Using At. ferrooxidans DSMZ 14,882 and an Unclassified Sulphur-Oxidising Consortium

Allan, Kathryn Mary; Bedzo, Oscar K. K.; Rensburg, Eugéne van; Görgens, Johann F.

doi:10.1007/s12649-021-01468-0

Cited by 4 publications

(2 citation statements)

References 31 publications

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“…Our results confirm the relevance of 1 H NMR to address the fate of elastomer in TRWP providing specific qualitative and semi-quantitative information particularly necessary in such complex particles. This approach also brings complementary results to the soluble/gel fraction determination technics which have been preferentially used to assess microbial devulcanization of rubbers (Allan et al, 2021;Kaewpetch et al, 2019;Yao et al, 2013). Generally, a mass ratio of both fractions after swelling in an organic solvent is used to evidence the decrease of the polymer crosslinking and the increase of the soluble fraction following the enzymatic breakages of sulphur bonds.…”

Section: Discussionmentioning

confidence: 99%

Assessing biodegradation of roadway particles via complementary mass spectrometry and NMR analyses

Calarnou,

Traïkia,

Leremboure

et al. 2023

Science of The Total Environment

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Section: Discussionmentioning

confidence: 99%

Assessing biodegradation of roadway particles via complementary mass spectrometry and NMR analyses

Calarnou,

Traïkia,

Leremboure

et al. 2023

Science of The Total Environment

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“…and Sphingomonas sp. can couple the oxidation of sulfur with the reduction of oxygen (aerobic process) as an energy-yielding process [18][19][20][21][22][23]. In a study using Acidithiobacillus to treat crumb rubber, microbial desulfurization was 22% more effective than a chemical treatment by utilizing the Neospagnol T-20 method [22].…”

Section: Introductionmentioning

confidence: 99%

Microbially Mediated Rubber Recycling to Facilitate the Valorization of Scrap Tires

Kabir,

Sundar,

Robles

et al. 2024

Polymers

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The recycling of scrap tire rubber requires high levels of energy, which poses challenges to its proper valorization. The application of rubber in construction requires significant mechanical and/or chemical treatment of scrap rubber to compatiblize it with the surrounding matrix. These methods are energy-consuming and costly and may lead to environmental concerns associated with chemical leachates. Furthermore, recent methods usually call for single-size rubber particles or a narrow rubber particle size distribution; this, in turn, adds to the pre-processing cost. Here, we used microbial etching (e.g., microbial metabolism) to modify the surface of rubber particles of varying sizes. Specifically, we subjected rubber particles with diameters of 1.18 mm and 0.6 mm to incubation in flask bioreactors containing a mineral medium with thiosulfate and acetate and inoculated them with a microbial culture from waste-activated sludge. The near-stoichiometric oxidation of thiosulfate to sulfate was observed in the bioreactors. Most notably, two of the most potent rubber-degrading bacteria (Gordonia and Nocardia) were found to be significantly enriched in the medium. In the absence of added thiosulfate in the medium, sulfate production, likely from the desulfurization of the rubber, was also observed. Microbial etching increased the surface polarity of rubber particles, enhancing their interactions with bitumen. This was evidenced by an 82% reduction in rubber–bitumen separation when 1.18 mm microbially etched rubber was used. The study outcomes provide supporting evidence for a rubber recycling method that is environmentally friendly and has a low cost, promoting pavement sustainability and resource conservation.

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Fill two needs with one deed: Simultaneous devulcanization and silica reinforcement of waste rubber for green tyre tread compound

Ghorai

Hait

Mondal

et al. 2023

Materials Today Communications

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The Microbial Devulcanisation of Waste Ground Tyre Rubber Using At. ferrooxidans DSMZ 14,882 and an Unclassified Sulphur-Oxidising Consortium

Cited by 4 publications

References 31 publications

Assessing biodegradation of roadway particles via complementary mass spectrometry and NMR analyses

Assessing biodegradation of roadway particles via complementary mass spectrometry and NMR analyses

Microbially Mediated Rubber Recycling to Facilitate the Valorization of Scrap Tires

Fill two needs with one deed: Simultaneous devulcanization and silica reinforcement of waste rubber for green tyre tread compound

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