Browsing by Author "Crispim, A."
Now showing 1 - 4 of 4
Results Per Page
Sort Options
- Footwear leather waste treatment: Energetic alternative ways against landfill disposalPublication . Alves, C.; Marques, D.; Crispim, A.(Introduction) Leather finished wastes resulting from the footwear manufacturing process are generated. Most of this waste is contaminated with chromium. Energetic valorization is one alternative to landfilling that must be evaluated, taking into account the current importance of energy. In this way, three technologies can be compared to evaluate this alternative: incineration, gasification, and pyrolysis. In recent years, a lot of research work has been done to evaluate the application of these technologies to leather solid waste.
- Leather wastes as a potential source of biochemicals and biomaterialsPublication . Dias, R.; Crispim, A.; Silva, P.; Neto, P.; Gaião, J.; Oliveira, J.Framework: Leather industry is one of the oldest and most traditional industries, although it produces high amount of solid waste and wastewater; • Only 20% of the of the hide results in finished leather products • Annually, 41,000 tons of organic solid waste are generated in Portugal; • From an economical and environmental point of view, there is a great interest in the valorisation of the generated solid wastes.
- Pyrolysis of cork residues - preliminary resultsPublication . Teixeira, J; Direito, D.; Crispim, A.; Ribeiro, A. M.; Silva, L. M. S.The energy from renewable sources is a topic that has been widely discussed and studied, especially since the use of fossil fuels in industrial processes are the principal source of environmental pollution. ln, this context, the processes of biomass gasification and pyrolysis are alternatives for energy enhancement, especially in rural areas [1]. One novel area that has begun to be investigated is the use of cork residues. Gasification studies have been conducted using several) samples of residues obtained during different phases of the cork manufacturing process in order to test their ability to produce energy [2]. An alternative to gasification is pyrolysis, which involves the carbonization of solid materials in an inert atmosphere, resulting in three distinct products: gas, oil and a carbon-rich solid residue. The formation of pyrolytic products is influenced by the operating conditions and the characteristics of the raw material [3]. The aim of this study was to investigate possible innovation in the cork industry by analysing the efficiency of pyrolysis of natural cork waste and by identifying optimal operating conditions, and the characteristics of the products obtained. ln, this paper some preliminary results are reported
- Wet-blue retanning process optimization for reducing water and energy consumption, and environmental impactPublication . Filipe, T.; Alves, C.; Freitas, T.; Crispim, A.; Dias, S.The process of transforming animal skin into leather comprises a range of chemical processes and mechanical operations that can be divided in four sectors such as beamhouse, tanning, dyeing, and finishing. In the dyeing sector, the chemical process (normally called retanning or dyeing process) has four main steps: neutralization, retanning, dyeing, and fatliquoring. A very important part of research in field of tanning industry is focused on develop and adapt alternative and clean processes, contributing to the sustainability of the planet. These new processes and methods enable an improvement of the quality of the leathers obtained while achieving a reduction in the energy and water consumption, as well as pollution generated.