Content of Selected Heavy Metals in Ni-Contaminated Soil Following the Application of Halloysite and Zeolite

Abstract

Nickel has been listed as a priory control pollutant by the United States Environmental Protection Agency (US EPA). Compared with other methods, the combination of vegetation and the addition of mineral sorbents to heavy metal-contaminated soils can be readily applied on a large scale because of the simplicity of technology and low cost. Halloysite and zeolite, among others, can be used for this purpose. A greenhouse study was performed to evaluate the feasibility of using natural zeolite, as well as raw and modified halloysite for the remediation of simulated Ni-contaminated soil. The soil was spiked with five doses of nickel, i.e. 0 (control), 80, 160, 240 and 320 mg•Ni kg-1 •soil. The average accumulation of heavy metals in nickelcontaminated soil was found to follow the decreasing order of Ni>Zn>Cr>Cu>Pb. The highest reduction of Pb content was observed in soil samples taken from pots containing 80 and 160 mg•kg-1 of Ni along with the addition of modified halloysite. The strongest effects were caused by natural zeolite, which significantly reduced the average content of chromium. Contamination at 320 mg Ni•kg-1 of soil led to the highest increases in the Ni, Pb and Cr contents of soil.

Influence of Various Passivators for Nickel Immobilization in Contaminated Soil of China

“…For this purpose, various remediation techniques have been performed, including physiochemical approaches and phytoextraction (Shaheen et al, 2015;Bashir et al, 2018a). Recently, the use of several organic and inorganic passivators has attained a considerable attention for the remediation of Ni contaminated soils (Shaheen et al, 2015;Radziemska and Mazur, 2016;Khan et al, 2017).…”

Enhanced Phytostabilization of Metal-Contaminated Soil after Adding Natural Mineral Adsorbents

“…Dolomite also had a positive, though lesser, infl uence. In another experiment conducted by Radziemska et al [22,3], chalcedonite and halloysite added to soil contaminated with heavy metals caused an increase in L. perenne and B. juncea biomass. Moreover, Wyszkowski and Radziemska [15,23] confi rm that zeolite increased the average yield of plants (oat, spring barley, and maize) grown on soil polluted with Cr(VI).…”

“…The application of dolomite led to a signifi cant decrease in Zn concentrations in soil as compared to the control pots. In an earlier experiment conducted by Radziemska and Mazur [22], the addition of zeolite, halloysite, diatomite, and limestone to soil contaminated with heavy metals caused a signifi cant decrease of Zn in the soil.…”

Pilot Scale Use of Compost Combined with Sorbents to Phytostabilize Ni-Contaminated Soil Using Lolium perenne L.

“…In another experiment conducted by Radziemska and Mazur [64], the addition of mineral amendments to soil contaminated with HMs caused a significant decrease of Ni in the soil. The application of amendments reduced CaCl 2 -extractable content of Ni in soil, with the most significant reduction observed for mixture of compost from food waste and chalcedonite treatment.…”