Stabilization of As-, Pb-, and Cu-contaminated soil using calcined oyster shells and steel slag

Moon, Deok Hyun; Wazne, Mahmoud; Cheong, Kyung Hoon; Chang, Yoon Young; Baek, Kitae; Ok, Yong Sik; Park, Jeong Hun

doi:10.1007/s11356-015-4612-6

Cited by 53 publications

(20 citation statements)

References 34 publications

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“…Moisture in the montmorillonite structure was removed, the structure was destroyed and collapsed, and the layered structure disappeared. This reduced the internal specific surface area, which decreased the adsorption quantity [48,49]. The destruction of the montmorillonite structure made the release of alkalinity difficult, which degraded the synergistic adsorption-coagulation effect.…”

Section: Determination Of the Calcination Temperaturementioning

confidence: 99%

Experimental Study on the Optimum Preparation of Bentonite–Steel Slag Composite Particles

Zhan

Xiao

2019

Sustainability

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Novel multifunctional adsorbent bentonite-steel slag composite particles (BSC) were developed for highly efficient and synergistic treatment of heavy metal ions in acid mine drainage (AMD). Single-factor experiments were performed to examine the influence of different parameters on the adsorption effect, alkalinity release quantity, and loss rate of the composite particles. Based on these results, an L9(4 3 ) orthogonal experiment was carried out, and the optimum levels and order of the factors were determined by range analysis. Finally, the optimum preparation process of the composite particles was determined: a bentonite-steel slag proportion of 5:5, Na 2 CO 3 content of 5%, aging time of 12 h, calcination particle size of 2 mm, calcination temperature of 500 • C, and calcination time of 60 min. The isothermal adsorption of optimum BSC fit well with Langmuir and Brunauer-Emmett-Teller (BET) isotherms (R 2 R 2 > 0.997). A synergistic adsorption-coagulation effect occurs, leading to the appearance of multiple layers locally on the surface of BSC, which satisfies the BET model. To understand the preparation mechanism of the BSC, bentonite, steel slag, uncalcined BSC, and the optimum BSC were characterized using scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) surface area analysis, X-ray powder diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR). The results indicate that calcination led to an increase in the average pore radius, total pore volume, and specific surface area (S BET ) in the optimum BSC; numerous pores were present on its layered surface. Although the layer spacing increased after calcination, the structure of the dioctahedra remained unchanged. Exchangeable Na + , montmorillonite, and alkaline components were present between the optimum BSC layers. Water and impurities were removed after calcination. The BSC not only released an alkalinity-neutralising acid but also induced a synergistic adsorption-coagulation effect that removed heavy metal ions. It is an excellent multifunctional protective material for the mining environment, that can treat AMD-containing heavy metal ions. Sustainability 2020, 12, 18 2 of 27 Current techniques for treating AMD containing heavy metals include the neutralization precipitation [11], electrochemical [12], membrane separation [13-15], microbial [16,17], constructed wetland [18], and adsorption [19,20] methods. Neutralization precipitation and adsorption are widely used [21,22]. However, neutralization precipitation requires a large amount of chemical agents, such as neutralizer and flocculent [23,24], which leads to difficulties in solid-liquid separation and high processing costs [25,26]. Besides various adsorbent materials, activated carbon is frequently used for adsorption, but has a low adsorption capacity for heavy metal ions, has high costs, and cannot neutralize acid [27][28][29]. At present, most treatments use a single method, and the treatment effect is poor. If two methods are connected in series, the process flow is long,...

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Section: Determination Of the Calcination Temperaturementioning

confidence: 99%

Experimental Study on the Optimum Preparation of Bentonite–Steel Slag Composite Particles

Zhan

Xiao

2019

Sustainability

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“…The increased soil pH by biochar showed a positive effect for the immobilization of the exchangeable Pb fraction, as observed in the Pearson correlation analysis (r = -0.91, p < 0.0001; Table S3). Lead tends to be stable under alkaline conditions by the formation of stable minerals (Moon et al, 2015). The release of K + , Na + , OH -, PO 4…”

Section: Geochemical Fractions Of Metalsmentioning

confidence: 99%

Slow pyrolyzed biochars from crop residues for soil metal(loid) immobilization and microbial community abundance in contaminated agricultural soils

et al. 2017

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This study evaluated the feasibility of using biochars produced from three types of crop residues for immobilizing Pb and As and their effects on the abundance of microbial community in contaminated lowland paddy (P-soil) and upland (U-soil) agricultural soils. Biochars were produced from umbrella tree [Maesopsis eminii] wood bark [WB], cocopeat [CP], and palm kernel shell [PKS] at 500 °C by slow pyrolysis at a heating rate of 10 °C min. Soils were incubated with 5% (w w) biochars at 25 °C and 70% water holding capacity for 45 d. The biochar effects on metal immobilization were evaluated by sequential extraction of the treated soil, and the microbial community was determined by microbial fatty acid profiles and dehydrogenase activity. The addition of WB caused the largest decrease in Pb in the exchangeable fraction (P-soil: 77.7%, U-soil: 91.5%), followed by CP (P-soil: 67.1%, U-soil: 81.1%) and PKS (P-soil: 9.1%, U-soil: 20.0%) compared to that by the control. In contrast, the additions of WB and CP increased the exchangeable As in U-soil by 84.6% and 14.8%, respectively. Alkalinity and high phosphorous content of biochars might be attributed to the Pb immobilization and As mobilization, respectively. The silicon content in biochars is also an influencing factor in increasing the As mobility. However, no considerable effects of biochars on the microbial community abundance and dehydrogenase activity were found in both soils.

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“…The removal of total and available cadmium by the stainless-steel slag may be attributed to the increased pH (13.96), porosity (14.50%), and surface area (2.31 m 2 g −1 ) essential for satisfactory adsorption. Steel slag is also used to stabilize metals, such as As, Pb, and Cu [39].…”

Section: Soil Remediation and Fertilizationmentioning

confidence: 99%

Usage of Steel Slag as a Construction Material and in Environmental Applications

Stjepanović

Hackenberger

et al. 2019

e-GFOS

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Steel slag is a by-product in the production of steel. An increase of its production results in more landfills. It is mostly used as a building material in the construction of roads, where it substitutes natural materials. The use of steel slag in road construction has multiple benefits; both by solving the challenges of waste disposal and preserving environmental resources by moderating the consumption of non-renewable and natural aggregates. Apart from being used as a building material, steel slag is also used in numerous environmental applications, such as soil and water remediation and CO2 sequestration. However, a multidisciplinary environmental impact study of steel slag, particularly regarding both the aquatic and terrestrial organisms, is lacking. Steel slag contains traces of potentially harmful elements that endanger these living organisms, including heavy metals released into the environment. A high pH value can also significantly influence their leaching properties, thereby affecting the organisms in the water and soil. Given the widespread utility of steel slag, it is recommended to make a thorough risk assessment associated with the various environmental applications of this material.

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Stabilization of As-, Pb-, and Cu-contaminated soil using calcined oyster shells and steel slag

Cited by 53 publications

References 34 publications

Experimental Study on the Optimum Preparation of Bentonite–Steel Slag Composite Particles

Experimental Study on the Optimum Preparation of Bentonite–Steel Slag Composite Particles

Slow pyrolyzed biochars from crop residues for soil metal(loid) immobilization and microbial community abundance in contaminated agricultural soils

Usage of Steel Slag as a Construction Material and in Environmental Applications

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