Mechanisms of Phosphorus Removal by Recycled Crushed Concrete
| Autor: | Yihuan Deng, Andrew D. Wheatley |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Langmuir
recycled concrete desorption phosphorus removal and recovery phosphorus speciation by sequential extraction thermal dynamic infinite focused microscope Health Toxicology and Mutagenesis lcsh:Medicine Portable water purification Wastewater 010501 environmental sciences 01 natural sciences Article Water Purification Adsorption Desorption Recycling Effluent 0105 earth and related environmental sciences Aggregate (composite) Construction Materials Chemistry Extraction (chemistry) lcsh:R Public Health Environmental and Occupational Health Phosphorus 04 agricultural and veterinary sciences Pulp and paper industry Kinetics 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Water Pollutants Chemical |
| Zdroj: | International Journal of Environmental Research and Public Health, Vol 15, Iss 2, p 357 (2018) International Journal of Environmental Research and Public Health; Volume 15; Issue 2; Pages: 357 International Journal of Environmental Research and Public Health |
| ISSN: | 1660-4601 |
| Popis: | Due to urbanisation, there are large amounts of waste concrete, particularly in rapidly industrialising countries. Currently, demolished concrete is mainly recycled as aggregate for reconstruction. This study has shown that larger sizes (2–5 mm) of recycled concrete aggregate (RCA) removed more than 90% of P from effluent when at pH 5. Analysis of the data, using equilibrium models, indicated a best fit with the Langmuir which predicated an adsorption capacity of 6.88 mg/g. Kinetic analysis indicated the equilibrium adsorption time was 12 h, with pseudo second-order as the best fit. The thermal dynamic tests showed that the adsorption was spontaneous and, together with the evidence from the sequential extraction and desorption experiments, indicated the initial mechanism was physical attraction to the surface followed by chemical reactions which prevented re-release. These results suggested that RCA could be used for both wastewater treatment and P recovery. |
| Databáze: | OpenAIRE |
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