Irrigation water quality influences heavy metal uptake by willows in biosolids

Journal of Environmental Management
W S LaidlawStefan K Arndt

Abstract

Phytoextraction is an effective method to remediate heavy metal contaminated landscapes but is often applied for single metal contaminants. Plants used for phytoextraction may not always be able to grow in drier environments without irrigation. This study investigated if willows (Salix x reichardtii A. Kerner) can be used for phytoextraction of multiple metals in biosolids, an end-product of the wastewater treatment process, and if irrigation with reclaimed and freshwater influences the extraction process. A plantation of willows was established directly onto a tilled stockpile of metal-contaminated biosolids and irrigated with slightly saline reclaimed water (EC ∼2 dS/cm) at a wastewater processing plant in Victoria, Australia. Biomass was harvested annually and analysed for heavy metal content. Phytoextraction of cadmium, copper, nickel and zinc was benchmarked against freshwater irrigated willows. The minimum irrigation rate of 700 mm per growing season was sufficient for willows to grow and extract metals. Increasing irrigation rates produced no differences in total biomass and also no differences in the extraction of heavy metals. The reclaimed water reduced both the salinity and the acidity of the biosolids significantly ...Continue Reading

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May 10, 2012·International Journal of Phytoremediation·Marta Susana ZubillagaRaúl S Lavado
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Mar 8, 2013·Chemosphere·Hazrat AliMuhammad Anwar Sajad
Jul 4, 2013·International Journal of Phytoremediation·Hoi-Fei MokStefan K Arndt

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Citations

Dec 21, 2016·International Journal of Phytoremediation·François CourchesneMichel Labrecque
Jan 14, 2017·International Journal of Phytoremediation·François CourchesneMichel Labrecque
Feb 23, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Zhan Wang, Markus Flury
May 11, 2018·Environmental Science and Pollution Research International·Xin YaoHualin Bian

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