Crushed autoclaved aerated concrete (CAAC), A potential reactive filter medium for enhancing phosphorus removal in nature-based solutions-preliminary batch studies
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hdl:2117/168674
Tipus de documentArticle
Data publicació2019-07-01
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Reconeixement 3.0 Espanya
Abstract
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.
CitacióCastellar, J. [et al.]. Crushed autoclaved aerated concrete (CAAC), A potential reactive filter medium for enhancing phosphorus removal in nature-based solutions-preliminary batch studies. "Water", 1 Juliol 2019, vol. 11, núm. 1412, p. 1-22.
ISSN2073-4441
Versió de l'editorhttps://www.mdpi.com/2073-4441/11/7/1442
Col·leccions
- GICITED - Grup Interdiciplinari de Ciència i Tecnologia en l'Edificació - Articles de revista [190]
- Departament de Tecnologia de l'Arquitectura - Articles de revista [559]
- Doctorat en Sostenibilitat - Articles de revista [109]
- SUMMLab - Sustainability Measurement and Modeling Lab - Articles de revista [93]
- Departament d'Òptica i Optometria - Articles de revista [447]
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water-11-01442-v3.pdf | 1,590Mb | Visualitza/Obre |