Mechanisms of Phosphorus Removal by Recycled Crushed Concrete

Yihuan Deng and Andrew Wheatley
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Yihuan Deng: School of Architecture, Building and Civil Engineering, Loughborough University, Loughborough, LE113 TU, UK
Andrew Wheatley: School of Architecture, Building and Civil Engineering, Loughborough University, Loughborough, LE113 TU, UK

IJERPH, 2018, vol. 15, issue 2, 1-16

Abstract: 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.

Keywords: desorption; recycled concrete; phosphorus removal and recovery; phosphorus speciation by sequential extraction; thermal dynamic; infinite focused microscope (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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