Crushed autoclaved aerated concrete (CAAC), A potential reactive filter medium for enhancing phosphorus removal in nature-based solutions-preliminary batch studies
Phosphorus (P) is a limited resource and can promote eutrophication of water streams and acidification of oceans when discharged. Crushed autoclaved aerated concrete (CAAC), a by-product from demolition, has shown great potential for recovering P. The potential of CAAC to be used in nature-based sol...
| Autores: | , , , , , , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2019 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositório: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglês |
| OAI Identifier: | oai:upcommons.upc.edu:2117/168674 |
| Acesso em linha: | https://hdl.handle.net/2117/168674 https://dx.doi.org/10.3390/w11071442 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Sewage Concrete Phosphorus Recycled concrete Tobermorite Kinetics Wastewater Reuse Calcium silicate hydrates Tobermorita Formigó reciclat Aigües residuals Àrees temàtiques de la UPC::Edificació::Impacte ambiental Àrees temàtiques de la UPC::Edificació::Materials de construcció::Formigó |
| Resumo: | Phosphorus (P) is a limited resource and can promote eutrophication of water streams and acidification of oceans when discharged. Crushed autoclaved aerated concrete (CAAC), a by-product from demolition, has shown great potential for recovering P. The potential of CAAC to be used in nature-based solutions as a P-reactive filter medium was evaluated by performing preliminary batch essays. Here, we evaluated the interactions and main effects of the initial concentration of P (Pi; 5, 10 or 20 mg L-1), particle size (PS; 4 or 5 mm) and contact time (CT; 60, 180, 360, 720 and 1440 min) upon the removal. We performed physical and chemical characterization to understand the removal processes. Data collected were fitted in adsorption kinetic models. The statistical analysis showed a significant interaction between CT and Pi, with the combination of its main effects stronger on P removal than each one separately. Intriguingly, we noticed that the higher the concentration of Pi, the faster and higher the removal of P. Contrary to expectations, PS 5 mm showed higher removal rates than PS 4 mm, indicating that besides adsorption, other unidentified chemical processes are in place. Further studies using columns/pilots with real wastewater are recommended for a future follow-up. |
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