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Valorização de resíduos da indústria de pasta de papel - Incorporação em misturas betuminosas para pavimentação rodoviária
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Abstract(s)
Do constante desenvolvimento social, tecnológico e industrial, urge a necessidade de uma adequada gestão dos recursos naturais e dos resíduos produzidos, de modo a mitigar e reduzir os impactos ambientais resultantes das atividades humanas. A importância da sustentabilidade e da circularidade dos materiais dos processos no setor industrial, tem sido sublinhada nos últimos anos. A reciclagem e valorização de resíduos assumem um papel relevante neste contexto. O estudo de formas de valorização de resíduos, transformando-os numa nova matéria-prima de outro processo, contribui para uma indústria sustentável e circular. Atualmente alguns resíduos resultantes do processo produtivo de pasta de papel são encaminhados para um Aterro Controlado de Resíduos, o que reforça a necessidade de encontrar formas de valorização dos mesmos. Apesar de na literatura existirem alguns trabalhos sobre a valorização destes resíduos, a sua possível incorporação em misturas betuminosas para pavimentação rodoviária tem vindo a ser alvo de estudo ao longo dos últimos tempos, estando, porém ainda pouco desenvolvida.A realização deste trabalho teve como objetivo caracterizar e explorar uma aplicação sustentável para dois dos resíduos resultantes da etapa de caustificação, da produção de pasta de papel, os dregs (resíduos do licor verde) e os grits (resíduos do apagador). A incorporação de dregs e grits na produção de misturas betuminosas foi explorada neste trabalho. Para a realização do estudo, além da mistura betuminosa de referência AC 14 surf 35/50, foram formuladas amostras com a incorporação de 5 e 10% de dregs, bem como de 5 e 10% de grits. Foram realizados ensaios de compressão de Marshall, sensibilidade à água e Wheel-Tracking de modo a avaliar o comportamento das misturas com dregs e grits.A aplicação de dregs em misturas betuminosas apresentou algumas limitações, na medida em que estes reduzem a estabilidade e resistência à compressão. Por sua vez, as misturas com incorporação de grits apresentaram um desempenho aceitável, o que torna esta forma de valorização de resíduos promissora, sendo de interesse a continuação de estudos mais aprofundados sobre o tema.
From the constant social, technological and industrial development, the need for an adequate management of natural resources and the waste produced is urgent, in order to mitigate and reduce the environmental impacts resulting from human activities. The importance of sustainability and circularity of process materials in the industrial sector has been underlined in recent years. Recycling and recovery of waste assume a relevant role in this context. The study of ways to valorize waste, transforming it into a new raw material for another process, contributes to a sustainable and circular industry. Currently some waste resulting from the pulp production process is sent to controlled landfill, which reinforces the need to find ways to recover it. Although there are some papers in the literature on the recovery of this waste, its possible incorporation into bituminous mixtures for road paving has been the subject of study in recent times, but it is still underdeveloped.This study aimed to characterize and explore a sustainable application for two of the residues resulting from the causticizing stage of pulp production, the dregs (green liquor waste) and grits (slaker waste). The incorporation of dregs and grits in the production of bituminous mixtures was explored in this work. To conduct the study, in addition to the reference asphalt mixture AC 14 surf 35/50, samples were formulated with the incorporation of 5 and 10% dregs, as well as 5 and 10% grits. Marshall compression, water sensitivity, and Wheel-Tracking tests were performed in order to evaluate the behaviour of the mixtures with dregs and grits.The application of dregs in asphalt mixtures presented some limitations in that they reduce stability and compressive strength. On the other hand, the mixtures incorporating grits showed an acceptable performance, which makes this form of waste valorization promising, being of interest the continuation of further studies on the subject.
From the constant social, technological and industrial development, the need for an adequate management of natural resources and the waste produced is urgent, in order to mitigate and reduce the environmental impacts resulting from human activities. The importance of sustainability and circularity of process materials in the industrial sector has been underlined in recent years. Recycling and recovery of waste assume a relevant role in this context. The study of ways to valorize waste, transforming it into a new raw material for another process, contributes to a sustainable and circular industry. Currently some waste resulting from the pulp production process is sent to controlled landfill, which reinforces the need to find ways to recover it. Although there are some papers in the literature on the recovery of this waste, its possible incorporation into bituminous mixtures for road paving has been the subject of study in recent times, but it is still underdeveloped.This study aimed to characterize and explore a sustainable application for two of the residues resulting from the causticizing stage of pulp production, the dregs (green liquor waste) and grits (slaker waste). The incorporation of dregs and grits in the production of bituminous mixtures was explored in this work. To conduct the study, in addition to the reference asphalt mixture AC 14 surf 35/50, samples were formulated with the incorporation of 5 and 10% dregs, as well as 5 and 10% grits. Marshall compression, water sensitivity, and Wheel-Tracking tests were performed in order to evaluate the behaviour of the mixtures with dregs and grits.The application of dregs in asphalt mixtures presented some limitations in that they reduce stability and compressive strength. On the other hand, the mixtures incorporating grits showed an acceptable performance, which makes this form of waste valorization promising, being of interest the continuation of further studies on the subject.
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Keywords
dregs grits resíduo método de valorização misturas betuminosas