Renewable energy from the waste soles through thermal pyrolysis-A novel approach

Abstract

Footwear is a booming sector in Bangladesh. Disposing of process residues from the footwear industries, especially production waste of thermoplastic rubber and polyvinyl chloride soles as well as human used soles is a big concern due to its non-biodegradability. In this work, waste thermoplastic rubber (TPR) and polyvinylchloride (PVC) soles were used as an energy source through the fixed-bed-fire-tube heating pyrolysis to reduce the pollution load. The experiments were performed at varying temperature within the range of 250 0 C to 450 0 C at every 100 0 C interval for each case. In pyrolysis oil, char and gas were produced from the both TPR and PVC soles; temperature increment was created more percentage of oil from the both soles. At same condition TPR sole was produced 12.3% more oil than PVC sole. The pyrolytic oils were made fractional distillation; obtained liquids were relatively greater in volume and low boiling range. The obtained liquids from the fractional distillation were exhibited more light fractions present in the pyrolytic polyvinyl chloride oil (PPVCO) than pyrolytic thermoplastic rubber oil (PTPRO). The process could be optimized for the large scale, which will offer advantages to reduce the environmental impact as well as the production of new product from the waste soles.

Waste to resource: An approach towards end-of-life investigation of defense used boot of Bangladesh for sustainable environment

“…The bottom (sole), on the other hand, is made of materials like vulcanized rubber (VR), ethyl vinyl acetate (EVA), thermoplastic rubber (TPR), polyvinyl chloride (PVC), etc. The majority of the footwear industries including boot manufacturing units in Bangladesh produce their shoes with soles made of thermoplastic rubber (TPR) and polyvinyl chloride (PVC) (Hashem, Paul et al 2017). The use of these different materials leads the post-consumer waste management process in a highly perplexing issue with numerous segments.…”

“…Pyrolysis is a thermo-chemical process that involves the heating of waste materials (organic or inorganic) at a higher temperature in the absence of oxygen, leading to the production of solid char, oil, and gas byproducts ( and polyvinyl chloride (PVC) soles were utilized as an energy source during the xed-bed-re-tube heating pyrolysis to lessen the pollution load as well as to produce new products from the waste soles such as oil, char, and gas (Hashem, Paul et al 2017). As mentioned in the earlier section in this work, the used boot contains a signi cant amount of leather, TPR soles, and other pyrolyze-able materials which could be better tted with the pyrolysis and provide value-added products.…”