Coal slime as a good modifier for the restoration of copper tailings with improved soil properties and microbial function

Zhou, Zhou; Xia, Ling; Wang, Xizhuo; Wu, Chenyu; Liu, Jiazhi; Li, Jianbo; Lu, Zijing; Song, Shaoxian; Zhu, Jiang; Montes, María Luciana; Benzaazoua, Mostafa

doi:10.1007/s11356-023-30008-7

Cited by 7 publications

(1 citation statement)

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“…Several authors have reported perennial ryegrass (Lolium perenne L.) as a suitable species for revegetation of metalliferous wastes (Alvarenga et al 2008;Arienzo et al 2004;Pitchel and Salt 1998), producing high dry matter yields and accumulating moderate to high levels of metals in its shoot biomass (Alvarenga et al 2008;Zhou et al 2023). However, there are still knowledge gaps on how wheat straw and biochar derived from straw influence growth of perennial ryegrass and metal accumulation in remediation of iron ore mine tailings.…”

Section: Introductionmentioning

confidence: 99%

Metal uptake from iron ore mine tailings by perennial ryegrass (Lolium perenne L.) is higher after wheat straw than wheat straw biochar amendment

Sarathchandra,

Rengel,

Solaiman

2024

Plant Soil

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Background and aims Mine tailings often contain high concentrations of metals that may lead to serious environmental concerns. Phytoremediation by suitable plant species, coupled with organic amendments, represents an intriguing way of improving the quality of mine tailings. Methodology We conducted a glasshouse pot study to assess the impact of biochar derived from wheat straw (BC) and wheat straw (WS) at different application rates (w/w: 0%, 1%, 2%, 5%, 10%) in enhancing physicochemical and biological attributes of iron ore mine tailings. Perennial ryegrass (Lolium perenne L.) growth and uptake of metals (Co, Cu, Fe, Mn, Zn, Cr, Ni, Pb) and As were assessed. Results The pH(H2O) of iron mine tailings (6.62 with 0% amendment) significantly increased to 8.01 in BC 10% but decreased to 5.33 in WS 10%. However, electrical conductivity, total carbon, total nitrogen and cation exchange capacity increased significantly with application of either amendment. Improvement in physicochemical parameters of tailings by amending with WS was associated with significantly greater plant growth compared with BC amendment. Shoot As and Pb accumulation by perennial ryegrass was low (below detection limit), whereas that of Co, Cu, Fe, Mn, Zn, Cr and Ni increased with an increase in both BC and WS application. Microbial biomass carbon and respiration were enhanced more in the WS than in BC treatments. Conclusion This study suggests wheat straw is a better amendment than biochar for the iron ore mine tailings.

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