A facile manufacture of highly adsorptive aggregates using steel slag and porous expanded silica for phosphorus removal

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Abstract

Natural adsorptive materials are mainly based on physical adsorption and have limited adsorption capacity. Artificial adsorptive aggregates lead to great potential in improving water quality for water treatment. This study aims to develop a porous and sustainable adsorptive aggregate combining both chemical and physical adsorption capacities. Industrial by-product steel slag (SS) powder is used in conjunction with porous expanded silicate (ES) powder applying a non-sintered pelletizing method for producing sustainable high adsorptive aggregates, and bio-based miscanthus (M) is used to further increase its permeability and porosity. The results show that the bulk density of the resulting adsorptive aggregates varies from 570 kg/m3 to 882 kg/m3, with a bulk crushing strength of up to 5.1 MPa. Moreover, all adsorptive aggregates have outstanding resistance to salt and freeze-thaw cycles. Phosphorus (P) adsorption tests show that the adsorptive aggregates remove the P in aqueous solution (168 mg/L), with an adsorption capacity of 4.2 mg/g. The research demonstrates that sustainable high adsorptive aggregates with good mechanical properties can be produced applying the facile pelletizing method, suitable for the application in the field of water treatment such as adsorptive concrete, constructed wetlands and rainwater gardens.

Keywords
Adsorptive aggregatePelletizingSteel slagExpanded silicaMiscanthusWater treatment
Original languageEnglish
Article number105238
Number of pages13
JournalResources, Conservation and Recycling
Volume166
Early online date31 Oct 2020
DOIs
Publication statusPublished - 1 Mar 2021

Bibliographical note

Funding Information:
This work was funded by China Scholarship Council (CSC) Fund (Grant No. 201806240037) and Eindhoven University of Technology. The authors gratefully thank Ing. Anneke Delsing for the chemical test and analysis, Mr. J.G. van Gilst from Vibers (The Netherlands), Dr. P. Spiesz from ENCI (The Netherlands) and Prof. dr. S.R. van der Laan from TATA Steel (The Netherlands) for the materials supply.

Funding Information:
This work was funded by China Scholarship Council (CSC) Fund (Grant No. 201806240037) and Eindhoven University of Technology. The authors gratefully thank Ing. Anneke Delsing for the chemical test and analysis, Mr. J.G. van Gilst from Vibers (The Netherlands), Dr. P. Spiesz from ENCI (The Netherlands) and Prof. dr. S.R. van der Laan from TATA Steel (The Netherlands) for the materials supply.

Publisher Copyright:
© 2020

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

  • Adsorptive aggregate
  • Expanded silica
  • Miscanthus
  • Pelletizing
  • Steel slag
  • Water treatment

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