Amending potential of organic and industrial by-products applied to heavy metal-rich mining soils

Ecotoxicology and Environmental Safety
Gabriel Caixeta MartinsLuiz Roberto Guimarães Guilherme

Abstract

Mining activities promote the development of economies and societies, yet they cause environmental impacts that must be minimized so that their benefits overcome the likely risks. This study evaluated eco-friendly technologies based on the use of low-carbon footprint wastes and industrial by-products as soil amendments for the revegetation of Zn-mining areas. Our goal was to select adequate soil amendments that can be used to recover these areas, with a focus on low-cost materials. The amendments - limestone, sewage sludge, biochar, and composted food remains - were first characterized concerning their chemical composition and structural morphologies. Soil samples (Entisol, Oxisol, Technosol) from three different areas located inside an open-pit mine were later incubated for 60 days with increasing doses of each soil amendment, followed by cultivation with Andropogon gayanus, a native species. The amendments were able to change not only soil pH, but also the phytoavailable levels of Cd, Zn, and Pb. Limestone and biochar were the amendments that caused the highest pH values, reducing the phytoavailability of the metals. All amendments improved seed germination; however, the composted food remains presented low levels of germinat...Continue Reading

Citations

Jul 16, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Sheng ChengBo Yan
Jan 20, 2019·Environmental Science and Pollution Research International·Borui LiuLiuye Sun
Aug 15, 2020·Environmental Science and Pollution Research International·Paula Godinho RibeiroLuiz Roberto Guimarães Guilherme
Jun 21, 2021·Environmental Science and Pollution Research International·Marleena HagnerKari Mäkitalo
Aug 25, 2021·Chemosphere·Paula Godinho RibeiroLuiz Roberto Guimarães Guilherme

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