Use of microbially desulfurized rubber to produce sustainable rubberized bitumen

Kabir, Sk Faisal; Zheng, Renfei; Delgado, Anca G.; Fini, Elham H.

doi:10.1016/j.resconrec.2020.105144

Cited by 43 publications

(25 citation statements)

References 35 publications

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“…Sulfate was measured using an ion chromatograph (IC, Metrohm 930 Compact IC Flex, Riverview, FL, USA) equipped with a suppressed conductivity detector, a Metrosep A Supp 5 Guard/4.0 column (Metrohm), and a Metrosep A Supp 5− 150/4.0 anion analytical column (Metrohm). 72 The method employed an eluent containing 1 mM NaHCO 3 and 3.2 mM Na 2 CO 3 (from Metrosep A Supp 5 eluent concentrate), a flow rate of 0.7 mL min −1 , and a temperature of 30 °C. The calibration range was 0.001−1 mM, and the sulfate detection limit was 0.3 μM.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Microbial Chain Elongation and Subsequent Fermentation of Elongated Carboxylates as H₂-Producing Processes for Sustained Reductive Dechlorination of Chlorinated Ethenes

Robles

Yellowman

Joshi

et al. 2021

Environ. Sci. Technol.

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In situ anaerobic groundwater bioremediation of trichloroethene (TCE) to nontoxic ethene is contingent on organohalide-respiring Dehalococcoidia, the most common strictly hydrogenotrophic Dehalococcoides mccartyi (D. mccartyi). The H2 requirement for D. mccartyi is fulfilled by adding various organic substrates (e.g., lactate, emulsified vegetable oil, and glucose/molasses), which require fermenting microorganisms to convert them to H2. The net flux of H2 is a crucial controlling parameter in the efficacy of bioremediation. H2 consumption by competing microorganisms (e.g., methanogens and homoacetogens) can diminish the rates of reductive dechlorination or stall the process altogether. Furthermore, some fermentation pathways do not produce H2 or having H2 as a product is not always thermodynamically favorable under environmental conditions. Here, we report on a novel application of microbial chain elongation as a H2-producing process for reductive dechlorination. In soil microcosms bioaugmented with dechlorinating and chain-elongating enrichment cultures, near stoichiometric conversion of TCE (0.07 ± 0.01, 0.60 ± 0.03, and 1.50 ± 0.20 mmol L–1 added sequentially) to ethene was achieved when initially stimulated by chain elongation of acetate and ethanol. Chain elongation initiated reductive dechlorination by liberating H2 in the conversion of acetate and ethanol to butyrate and caproate. Syntrophic fermentation of butyrate, a chain-elongation product, to H2 and acetate further sustained the reductive dechlorination activity. Methanogenesis was limited during TCE dechlorination in soil microcosms and absent in transfer cultures fed with chain-elongation substrates. This study provides critical fundamental knowledge toward the feasibility of chlorinated solvent bioremediation based on microbial chain elongation.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

Microbial Chain Elongation and Subsequent Fermentation of Elongated Carboxylates as H₂-Producing Processes for Sustained Reductive Dechlorination of Chlorinated Ethenes

Robles

Yellowman

Joshi

et al. 2021

Environ. Sci. Technol.

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“…Crumb-rubber-modified asphalt (CRMA) not only makes use of a large number of waste tires and reduces pollution, but also has excellent high-and low-temperature properties, which can effectively extend the service life of pavements and reduce the occurrence of pavement distress [3][4][5][6]. The traditional CRMA preparation process is simple and fast, but at the same time, there are some drawbacks [7,8]. Firstly, as CR and asphalt are thermodynamically incompatible systems, in the CRMA preparation process, in order for the modified asphalt to achieve a certain performance, the amount of CR needs to be higher than 15%, resulting in the fact that the CR dispersed in the asphalt is difficult to form into a plastic mesh structure.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Aging Properties of Terminal Blend Hybrid Asphalt Based on Chemical and Rheological Methods

Wang

Huang²,

Liu³

et al. 2022

Sustainability

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The chemical and rheological properties of terminal blend hybrid asphalt (TBHA) contributing to the consumption of waste tires before and after aging were studied. Styrene-butadiene-styrene (SBS) polymer, sulphur, crumb rubber (CR), and neat asphalt were chosen to prepare the TBHA. The short-term aging (STA) and long-term aging (LTA) of TBHA were simulated using a rolling thin film oven test (RTFOT) and pressure aging vessel (PAV), separately. The chemical and rheological properties of the TBHA were tested. The results show that the G* and G*/sin δ of TBHA ares generally lower than SBS-modified asphalt (SBSMA) at 76 °C, and the δ, Jnr0.1, and Jnr3.2 of TBHA are generally higher than SBSMA at 76 °C. Additionally, with the decrease of CR, the G* and G*/sin δ of TBHA decreased more obviously, and the G* and G*/sin δ of 5T_3S_0.2Sul (5 wt% CR, 3 wt% SBS, and 0.2 wt% sulphur) were the smallest. Moreover, during the STA, the SBS modifier in the TBHA degraded and made the bitumen predominantly soft; however, during the LTA, the hardening of the bitumen played a dominant role and increased its elasticity. The superior anti-aging properties of TBHA (both STA and LTA) are further demonstrated.

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“…In China, approximately 15 million tons of waste tires are disposed of annually, resulting in plenty of waste tires in landfills and stockpiles . Waste tires can be recycled as fuel or asphalt modifiers. , If the forestry residues and waste tire would be co-pyrolyzed, high-quality pyrolysis oil could be obtained for road material application.…”

Section: Introductionmentioning

confidence: 99%

“…29 Waste tires can be recycled as fuel or asphalt modifiers. 30,31 If the forestry residues and waste tire would be co-pyrolyzed, high-quality pyrolysis oil could be obtained for road material application.…”

Section: ■ Introductionmentioning

confidence: 99%

Balancing the Aromatic and Ketone Content of Bio-oils as Rejuvenators to Enhance Their Efficacy in Restoring Properties of Aged Bitumen

Rajib

Sarker

et al. 2021

ACS Sustainable Chem. Eng.

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The potential of the bio-oil from the co-pyrolysis of poplar wood and waste tire rubber to revitalize severely aged bitumen was examined by shifting the balance of aromatics and ketones in the bio-oil. Laboratory experiments were performed to compare the revitalization efficiency of bio-oils from the pyrolysis of poplar wood and co-pyrolysis of wood and waste tire rubber. Furthermore, the chemical compositions of the bio-oils from both processes were studied using gas chromatography−mass spectrometry to distinguish how each bio-oil revitalized severely aged bitumen. The results showed that the wood pyrolysis bio-oil had high phenol and ketone relative contents but very low aromatic and alkane relative contents. In contrast, significant relative amounts (19.18%) of aromatics and alkanes and a lower ketone relative content (0.95%) were found in the co-pyrolysis bio-oil. The rheological characterization of aged bitumen rejuvenated with both bio-oils showed that the co-pyrolysis bio-oil was much more effective than the wood pyrolysis bio-oil, which was evidenced by a higher crossover modulus and frequency as well as lower shear thinning in the aged bitumen rejuvenated by the co-pyrolysis bio-oil. These results prove that the co-pyrolysis bio-oil is a potential asphalt rejuvenator.

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Use of microbially desulfurized rubber to produce sustainable rubberized bitumen

Cited by 43 publications

References 35 publications

Microbial Chain Elongation and Subsequent Fermentation of Elongated Carboxylates as H₂-Producing Processes for Sustained Reductive Dechlorination of Chlorinated Ethenes

Microbial Chain Elongation and Subsequent Fermentation of Elongated Carboxylates as H₂-Producing Processes for Sustained Reductive Dechlorination of Chlorinated Ethenes

Evaluation of the Aging Properties of Terminal Blend Hybrid Asphalt Based on Chemical and Rheological Methods

Balancing the Aromatic and Ketone Content of Bio-oils as Rejuvenators to Enhance Their Efficacy in Restoring Properties of Aged Bitumen

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Use of microbially desulfurized rubber to produce sustainable rubberized bitumen

Cited by 43 publications

References 35 publications

Microbial Chain Elongation and Subsequent Fermentation of Elongated Carboxylates as H2-Producing Processes for Sustained Reductive Dechlorination of Chlorinated Ethenes

Microbial Chain Elongation and Subsequent Fermentation of Elongated Carboxylates as H2-Producing Processes for Sustained Reductive Dechlorination of Chlorinated Ethenes

Evaluation of the Aging Properties of Terminal Blend Hybrid Asphalt Based on Chemical and Rheological Methods

Balancing the Aromatic and Ketone Content of Bio-oils as Rejuvenators to Enhance Their Efficacy in Restoring Properties of Aged Bitumen

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Microbial Chain Elongation and Subsequent Fermentation of Elongated Carboxylates as H₂-Producing Processes for Sustained Reductive Dechlorination of Chlorinated Ethenes

Microbial Chain Elongation and Subsequent Fermentation of Elongated Carboxylates as H₂-Producing Processes for Sustained Reductive Dechlorination of Chlorinated Ethenes