Hydrothermal liquefaction of post-consumer mixed textile waste for recovery of bio-oil and terephthalic acid

Matayeva, Aisha; Biller, Patrick

doi:10.1016/j.resconrec.2022.106502

Cited by 20 publications

(3 citation statements)

References 49 publications

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“…Hydrothermal liquefaction was performed on post-consumer polyester and cotton textiles, and it was revealed that 95% cotton/5% polyester blend gave the highest bio-oil yield, 26%, at 325 • C under alkali conditions. However, 50% cotton/ 50% polyester blend produced more terephthalic acid [69]. The hydrothermal approach can also be employed as pretreatment for textile waste.…”

Section: Thermal Recyclingmentioning

confidence: 99%

State of the Art in Textile Waste Management: A Review

Tang

2023

Textiles

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Textile waste constitutes a significant fraction of municipal solid waste sent to landfill or incinerated. Its innovative management is important to enhance sustainability and circularity. This review aims to present the latest policies and the state-of-the-art technologies in the collection, sorting and recycling of textile waste. Policies at global and regional levels are increasingly made to address the sustainability of the textile industry and integrate the concept of circular economy. They are crucial to driving changes and innovations in current textile waste management. The Internet of Things, big data, blockchain and smart contracts have been proposed to improve transparency, traceability and accountability in the textile waste collection process. They optimize collection routes, and transactions and agreements among stakeholders. The sorting of textile waste using near-infrared spectroscopy, optical sorting and artificial intelligence enables its separation based on composition, color and quality. The mechanical recycling of textiles regenerates fibers with the same or different applications from those of the original fabrics. Fibers have been used for making building and slope protection materials. Chemical recycling depolymerizes waste textiles using chemicals to produce monomers for new textiles or other materials, while biological recycling uses enzymes and microorganisms for this purpose instead of chemicals. Thermal recycling recovers energy and fuels from textile waste through pyrolysis, gasification and hydrothermal liquefaction. These innovations may have the drawbacks of high cost and scalability. This review contributes to decision making by synthesizing the strengths and weaknesses of the innovations in textile waste management.

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Section: Thermal Recyclingmentioning

confidence: 99%

State of the Art in Textile Waste Management: A Review

Tang

2023

Textiles

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“…With the recent advent of fast fashion, the short-term usage of textiles has resulted in large amounts of waste textiles (Athanasopoulos and Zabaniotou, 2022;Lopatina et al, 2021;Martikkala et al, 2023). Today, dyed cotton textiles waste is mostly disposed of in landfills or incinerators (Matayeva and Biller, 2022;Cho et al, 2023;Han et al, 2022). This approach causes serious waste of resources and contamination of the environment (Stefan et al, 2022;Leal et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Efficient decolorization of reactive dyed cotton fabric with a two-step NaOH/ Na 2 S 2 O 4 process

Wang

et al. 2023

Preprint

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Waste cotton textiles can be decolorized with the NaOH/Na2S2O4 reducing system with mild and effective results. Nevertheless, this system consumes substantial amounts of Na2S2O4, resulting in an inefficient decomposition process. The present study proposed a two-step NaOH/Na2S2O4 method to decolorize the reactive-dyed cotton fabric. The decolorization mechanism of NaOH and Na2S2O4 was investigated based on the decolorization kinetics. The results showed that Na2S2O4 decolorized the dyed cotton fabric more quickly than NaOH. In the reduction system, the decolorization mechanism of NaOH and Na2S2O4 individually followed a three-order kinetic law. During the decolorization process, a hydrolysis reaction between NaOH and cotton fiber destroyed the covalent bond, and a reduction reaction between Na2S2O4 and the dye destroyed the chromophore. The two-step NaOH/Na2S2O4 method improved the decolorization of dyed cotton fabric by reducing the ineffective decomposition of Na2S2O4. Compared to traditional methods, the two-step method endowed the decolorized fabric with a 16% higher CIE L value. Notably, the decolorized cotton fabric retained about 90% of its breaking strength.

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“…In addition, disodium terephthalate (TADS), a characteristic pollutant of alkali reduction wastewater, can change into terephthalic acid (TPA) by acidifying with sulfuric acid. , TPA is a crucial industrial raw chemical that is extensively utilized in the food, cosmetics, and unsaturated polyester resin sectors. It had been reported that the hydrolytic precipitation of TPA from alkali reduction wastewater can be realized via the regulation of pH with sulfuric acid. − Moreover, it is the general trend to solve the problem of resource shortage and take the road of sustainable development . Therefore, more and more attention is paid to green water treatment methods and resource utilization of wastewate.…”

Section: Introductionmentioning

confidence: 99%

Resources Recycle of Printing and Dyeing Wastewater: UF/FO Hybrid System Optimization and TPA Recovery

et al. 2022

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Printing and dyeing wastewater has characteristics of high pH, poor biodegradability, complex composition, and a large amount of water, which means it remains a daunting environmental issue. The development of efficient and economic printing and dyeing wastewater treatment technology has gained considerable interest in the field of environmental protection. The performance of ultrafiltration/ forward osmosis (UF/FO) hybrid system focused on recycling valuable materials in actual printing and dyeing wastewater was investigated. The effects of pressure, temperature, membrane orientation, and feed pH on membrane performance were also studied. The results showed that the optimal pressure and temperature (T) are 0.15 MPa and 25 °C, respectively; active-layer facing feed solution (AL-FS) mode at pH 7 was used for a UF/FO hybrid system. The recovery of terephthalic acid (TPA) was 99.78% under pH 4. This paper provided a resourceful proposal for the treatment of printing and dyeing wastewater.

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Hydrothermal liquefaction of post-consumer mixed textile waste for recovery of bio-oil and terephthalic acid

Cited by 20 publications

References 49 publications

State of the Art in Textile Waste Management: A Review

State of the Art in Textile Waste Management: A Review

Efficient decolorization of reactive dyed cotton fabric with a two-step NaOH/ Na 2 S 2 O 4 process

Resources Recycle of Printing and Dyeing Wastewater: UF/FO Hybrid System Optimization and TPA Recovery

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