Avaliação da viabilidade da utilização de lodo de estação de tratamento de água em peças de concreto para pavimentação intertravada
The waste sludge from water treatment results of various operations that aim to suit the water into the legal standards of potability. This sludge has a variable chemical composition, depending on many factors, such as quality of the raw water and the characteristics of the chemical products used du...
| Principais autores: | Fernandez, Lucas Plattner, Mikowski, Paula Cristina Buss |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/8067 |
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| Resumo: |
The waste sludge from water treatment results of various operations that aim to suit the water into the legal standards of potability. This sludge has a variable chemical composition, depending on many factors, such as quality of the raw water and the characteristics of the chemical products used during the procedures. Although there are many alternatives for treating this waste sludge, the usually used final dispositions (water courses, landfills and sewage treatment stations) still represents huge environmental impacts and overload the public systems. Searching for technical, environmental and economical solutions is one important way of reducing the environmental liabilities associated with this waste sludge. Among the various possibilities of reutilization, the application of this waste sludge from water treatment in building materials, such as concrete and ceramics, is one of the most attractive. The main aim of the present study was to evaluate the technical viability of adding waste sludge form water treatment in the production of interlocking concrete paver units. In order of achieving the objective, various interlocking concrete paver samples were produced with different levels of waste sludge from water treatment, in its natural moisture, added into the concrete. Later, others samples were produced with dried waste sludge, based on the previous analysis of different levels of addition. 5 types of concrete were produced: without any addition of waste sludge, to be used as reference; with 2,5%, 5,0% and 7,5% of addition of waste sludge in its natural moisture; with 5,0% of addition of dried waste sludge. Many analysis of the chemical composition of the waste sludge from water treatment were done and, beyond that, attempts of analyzing the possibility of oxidizing the waste sludge through the utilization of hydrogen peroxide (H2O2). The interlocking concrete paver samples were evaluated for its fresh characteristics, for its compression and flexural resistance strengths and for its physical indexes, void contend, water absorption and specific mass. It was noticed that up to 5,0% of waste sludge addition, both in its natural moisture and dried, the analyzed properties get slightly worse, but not in a way of avoiding its addition into the interlocking concrete paver. The addition of 7,5% of waste sludge ended up significantly harming various analyzed properties. Besides the better workability of the fresh concrete, no improvements were noticed by drying the waste sludge. It became clear that the amount of waste sludge added into the concrete is a limiting factor. It was concluded that the addition of waste sludge from water treatment into interlocking concrete paver is viable, as long as in small quantities. |
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