Percorrer por autor "Cabral, Rafaela Mulinari"
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- Cement mortar with valuation of wwtp sludge from the tannery industryPublication . Cabral, Rafaela Mulinari; Martins, Ramiro; Pietrobelli, Juliana Martins TeixeiraThe diverse and substantial quantity of waste generated by industries, combined with the scarcity of natural resources, necessitates the analysis, development, and implementation of treatment mechanisms to recover and reuse materials and substances to minimize the impacts of waste disposal in the environment. The leather tanning industry, which is responsible for leather processing, is a major polluter because hazardous and heavy materials are used in its processes. Among various alternatives, waste can be incorporated into cementitious matrices. The objective of this study was to investigate the valorization of sludge from Leather Tannery Wastewater Treatment Plants (WWTP) through its incorporation into cement, as well as technical and economic evaluation. Four scenarios were studied: low-moisture sludge, two types of ash obtained via incineration, and wet oxidation. Mortar specimens were prepared with different replacement proportions of cement (0%, 3%, 5%, 7% and 10%), which were evaluated for flexural and compressive strength, as well as two complementary water absorption and leaching tests. The results exceeded expectations, as in most cases, they demonstrated an increase in resistance, a decrease or stabilization in water absorption, and minimal release of pollutants and contaminants into the environment with an increasing percentage of replacement. Notably, the replacement of 10% of sludge using the incineration method yielded the most favorable outcomes, whereas the wet oxidation method produced the least favorable results.
- Leather tanning sludge in cement mortar: Sustainable valorisationPublication . Martins, Ramiro; Cabral, Rafaela Mulinari; Pietrobelli, Juliana Martins TeixeiraThis study aims to investigate the valorisation of sludge from Leather Tannery Wastewater Treatment Plants (LTWWTP) by incorporating it into cement mortars. Theoretical framework: The substantial quantity of waste generated by industries coupled with the scarcity of natural resources calls for the analysis, development, and implementation of treatment methods to recover and reuse materials, thereby minimising the environmental impact of waste disposal. The leather tanning industry, a significant polluter due to its use of hazardous and heavy materials, requires sustainable solutions for waste management. One promising approach is the incorporation of waste into cementitious matrices. Method: Three scenarios were examined: low-moisture sludge, ash obtained via incineration, and wet oxidation. Test specimens were prepared with varying proportions of cement replacement (0, 3, 5, 7, and 10%), and their flexural and compressive strengths were evaluated. Additionally, chemical analyses were conducted to assess solubility. Results and Conclusion: The results indicate that sludge can be used in small proportions without compromising the mechanical strength of the mortar. Substituting 10% cement with ash using the INC-2 incineration method improved mortar quality, exhibiting a higher compressive strength of 41 MPa and minimal water absorption (3.28%). Research implications: Drawing from these promising findings, it can be confidently asserted that utilising WWTP sludge in mortar is a practical, eco-conscious solution for civil construction. Furthermore, it is a pivotal step towards addressing the challenge of hazardous sludge disposal. Originality/value: The findings from this research will contribute to sustainable waste management practices and pave the way for responsible and eco-friendly utilisation of industrial waste in cementitious materials, thus minimising environmental burdens.