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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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  • Joana America Castellar da Cunha, Universitat Politècnica de Catalunya
  • ,
  • Joan Formosa, Departament de Ciencia de Materials i Quimica Fisica i Engenyeria de Materiales, Universitat de Baercelona, Spanien
  • Josep Maria Chimenos, Departament de Ciencia de Materials i Quimica Fisica, Universitat de Barcelona, Spanien
  • Joan Canals, Polytechnic University of Catalonia
  • ,
  • Montserrat Bosch Gonzalez, GICITED Grupo Interdisciplinar de Ciencia y Technología en Edificación. Universidad Politécnica de Cataluna, Spanien
  • Joan Ramon Rosell, GICITED Grupo Interdisciplinar de Ciencia y Technología en Edificación. Universidad Politécnica de Cataluna, Spanien
  • Heraldo Peixoto da Silva, Universidade Federal de Bahia, Instituto de Geociecias, Brasilien
  • Jordi Morato, Universitat Politècnica de Catalunya, Spanien
  • Hans Brix
  • Carlos Alberto Arias
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.
StatusUdgivet - jul. 2019

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