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Mechanisms of Phosphorus Removal by Recycled Crushed Concrete

Author

Listed:
  • 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)

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.

Suggested Citation

  • Yihuan Deng & Andrew Wheatley, 2018. "Mechanisms of Phosphorus Removal by Recycled Crushed Concrete," IJERPH, MDPI, vol. 15(2), pages 1-16, February.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:2:p:357-:d:132310
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    References listed on IDEAS

    as
    1. İsmail Tosun, 2012. "Ammonium Removal from Aqueous Solutions by Clinoptilolite: Determination of Isotherm and Thermodynamic Parameters and Comparison of Kinetics by the Double Exponential Model and Conventional Kinetic Mo," IJERPH, MDPI, vol. 9(3), pages 1-15, March.
    2. Reijnders, L., 2014. "Phosphorus resources, their depletion and conservation, a review," Resources, Conservation & Recycling, Elsevier, vol. 93(C), pages 32-49.
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    Cited by:

    1. Lei Li & Chenxi Li & Kun Wu & Shuting Zhou & Wei Hu & Jiangzhou Qin & Zhengfang Ye, 2023. "Insight into the Enzymatic Mechanism of Straw Carbon Source and Its Denitrification Availability," Sustainability, MDPI, vol. 15(11), pages 1-16, May.
    2. Agnieszka Bus, 2022. "Implementation of P-Reactive Layer for Improving Urban Water Quality: Kinetic Studies, Dimensioning and Economic Analysis," Sustainability, MDPI, vol. 14(15), pages 1-16, July.
    3. Jinquan Zhang & Weiguo Fu, 2020. "Sponge effect of aerated concrete on phosphorus adsorption-desorption from agricultural drainage water in rainfall," Soil and Water Research, Czech Academy of Agricultural Sciences, vol. 15(4), pages 220-227.

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