Publicação
Eco-friendly cement mortar with WWTP sludge recovery
| Resumo: | The increase in sludge generation in wastewater treatment plants (WWTP) makes sludge management a difficult task so that it is necessary to create alternatives for the final sludge disposal. The mineralogical characteristics of the sludge allow it to be applied to construction materials. The construction industry is the one that most exploits and consumes natural resources and uses energy intensively, thus generating quite considerable environmental impacts. Creating sludge utilisation techniques in the construction industry provides a safe and stable destination for sludge and contributes to reducing the environmental impacts that the construction industry already has. Thus, the general objective of this project was to evaluate the technical feasibility and economic valuation of the use of WWTP sludge for partial replacement of cement in the production of mortar. For the study, sludge was collected from the WWTP in Bragança, and it was characterised by pH, humidity, total solids, and organic matter content. Different methods (5) were used to prepare the sludge for the mortar. Mortars were produced with 0 (standard, reference mortar), 3, 5, 7 and 10% replacement of cement by treated sludge. With the manufactured mortar, specimens were moulded to test the resistance to flexion and compression. Mortar with 7% sludge ash showed greater resistance than standard mortar, only mortars with wet oxidised sludge showed a resistance rating lower than standard mortar. Thus, the use of dry sludge mortar and ash presented satisfactory results. Comparisons of energy consumption have shown that using sludge in mortars represents significant energy savings. |
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| Autores principais: | Grabowski, Thais Theomaris dos Santos |
| Assunto: | Eco-friendly Concrete Mortar WWTP Sludge Mechanical resistance Energy consumption |
| Ano: | 2020 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Instituto Politécnico de Bragança |
| Idioma: | inglês |
| Origem: | Biblioteca Digital do IPB |
| Resumo: | The increase in sludge generation in wastewater treatment plants (WWTP) makes sludge management a difficult task so that it is necessary to create alternatives for the final sludge disposal. The mineralogical characteristics of the sludge allow it to be applied to construction materials. The construction industry is the one that most exploits and consumes natural resources and uses energy intensively, thus generating quite considerable environmental impacts. Creating sludge utilisation techniques in the construction industry provides a safe and stable destination for sludge and contributes to reducing the environmental impacts that the construction industry already has. Thus, the general objective of this project was to evaluate the technical feasibility and economic valuation of the use of WWTP sludge for partial replacement of cement in the production of mortar. For the study, sludge was collected from the WWTP in Bragança, and it was characterised by pH, humidity, total solids, and organic matter content. Different methods (5) were used to prepare the sludge for the mortar. Mortars were produced with 0 (standard, reference mortar), 3, 5, 7 and 10% replacement of cement by treated sludge. With the manufactured mortar, specimens were moulded to test the resistance to flexion and compression. Mortar with 7% sludge ash showed greater resistance than standard mortar, only mortars with wet oxidised sludge showed a resistance rating lower than standard mortar. Thus, the use of dry sludge mortar and ash presented satisfactory results. Comparisons of energy consumption have shown that using sludge in mortars represents significant energy savings. |
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