Recycling of waste blended textile with green solvent and close the loop
Ara, Ismat (2023)
Diplomityö
2023
School of Energy Systems, Ympäristötekniikka
Kaikki oikeudet pidätetään.
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2023052648397
https://urn.fi/URN:NBN:fi-fe2023052648397
Tiivistelmä
Recycling strategies for textiles are evidently in need of further development. An upcycling technique for polyester- cotton blended waste textiles support the creation of a circular economy aspect for textile waste. However, due to its heterogeneity, it is difficult to recycle blended textiles. Various methods have been employed to separate waste polyester-cotton blended textiles for recycling by separating the components or solubilizing or degrading the component that is to be recycled. But many of them was not successful as the process impacts the quality of recovered materials.
The separation of cotton and polyester fractions from waste polyester cotton blended textiles was done with Natural Deep Eutectic Solvent (NADES) treatment. To enable the successful separation, the treatment time, temperature and solid to DES ratio have been investigated. The optimum DES treatment condition was 110C, 6h with solid to DES ratio 1:10. The efficiency of recovered fraction for cotton was 98.2% and for polyester was 99%. The membrane preparation from the recovered polyester and cotton fraction was studied. The membrane preparation parameters such as coagulation bath conditions, membrane skin layer thickness, additives, and polymer concentration impact were researched. The polyethylene (PEG) 35kDa retention value for 10wt% cellulose membranes was 99%. And for polyester membrane 18 wt% with 4% PEG as additive, resulted in the retention of 4 kDa PEG value of 99%. Cotton and Polyester (PET) fractions were successfully separated from waste polyester cotton blended fabric (WP-CFs) by a novel process based on NADES assisted solvent extraction procedure. Furthermore, the fabricated membranes can be used in different wastewater treatment process especially in harsh conditions.
The separation of cotton and polyester fractions from waste polyester cotton blended textiles was done with Natural Deep Eutectic Solvent (NADES) treatment. To enable the successful separation, the treatment time, temperature and solid to DES ratio have been investigated. The optimum DES treatment condition was 110C, 6h with solid to DES ratio 1:10. The efficiency of recovered fraction for cotton was 98.2% and for polyester was 99%. The membrane preparation from the recovered polyester and cotton fraction was studied. The membrane preparation parameters such as coagulation bath conditions, membrane skin layer thickness, additives, and polymer concentration impact were researched. The polyethylene (PEG) 35kDa retention value for 10wt% cellulose membranes was 99%. And for polyester membrane 18 wt% with 4% PEG as additive, resulted in the retention of 4 kDa PEG value of 99%. Cotton and Polyester (PET) fractions were successfully separated from waste polyester cotton blended fabric (WP-CFs) by a novel process based on NADES assisted solvent extraction procedure. Furthermore, the fabricated membranes can be used in different wastewater treatment process especially in harsh conditions.