Crushed concrete as a phosphate binding material: a potential new management tool

Journal of Environmental Quality
Sara EgemoseMogens R Flindt

Abstract

To avoid eutrophication of receiving waters, effective methods to remove P in urban and agricultural runoff are needed. Crushed concrete may be an effective filter material to remove dissolved and particulate P. Five types of crushed concrete were tested in the laboratory to evaluate the retention capacity of dissolved P. All types removed P very effectively (5.1-19.6 g P kg(-1) concrete), while the possible release of bound P varied between 0.4 and 4.6%. The retention rate was positively related to a decreasing concrete grain size due to an increasing surface area for binding. The P retention was also related to a marked increase in pH (up to pH 12), and the highest retention was observed when pH was high. Under these circumstances, column experiments showed outlet P concentrations <0.0075 mg P L(-1). Furthermore, experiments revealed that release of heavy metals is of no importance for the treated water. We demonstrate that crushed concrete can be an effective tool to remove P in urban and agricultural runoff as filter material in sedimentation/infiltration ponds provided that pH in the treated water is neutralized or the water is diluted before outlet to avoid undesired effects caused by the high pH.

References

Oct 19, 2001·Journal of Hazardous Materials·A PolettiniF Testa
Jun 9, 2005·Journal of Environmental Quality·Miriam ReinhardtBeat Müller

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Citations

Jan 23, 2015·Environmental Technology·C Siobhan DunetsMike Dixon
Mar 18, 2015·The Science of the Total Environment·Maebh A GraceEoghan Clifford
Feb 22, 2018·International Journal of Environmental Research and Public Health·Yihuan Deng, Andrew Wheatley
Jun 16, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Agnieszka Bus, Agnieszka Karczmarczyk
Nov 13, 2013·Journal of Environmental Quality·Andrew SharpleyPeter Kleinman
May 9, 2012·Journal of Environmental Quality·Anthony R BudaWim J Chardon
May 9, 2012·Journal of Environmental Quality·Ray B BryantArthur L Allen
Apr 4, 2021·Materials·Glaydson Simões Dos ReisCarlos Hoffmann Sampaio

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