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Open AccessArticle

Mechanisms of Phosphorus Removal by Recycled Crushed Concrete

School of Architecture, Building and Civil Engineering, Loughborough University, Loughborough, LE113 TU, UK
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Int. J. Environ. Res. Public Health 2018, 15(2), 357; https://doi.org/10.3390/ijerph15020357
Received: 9 January 2018 / Revised: 26 January 2018 / Accepted: 8 February 2018 / Published: 17 February 2018
(This article belongs to the Special Issue Municipal Wastewater Treatment)
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. View Full-Text
Keywords: desorption; recycled concrete; phosphorus removal and recovery; phosphorus speciation by sequential extraction; thermal dynamic; infinite focused microscope desorption; recycled concrete; phosphorus removal and recovery; phosphorus speciation by sequential extraction; thermal dynamic; infinite focused microscope
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Deng, Y.; Wheatley, A. Mechanisms of Phosphorus Removal by Recycled Crushed Concrete. Int. J. Environ. Res. Public Health 2018, 15, 357.

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