Stabilization of heavy metals in soil using two organo-bentonites

Yu, Kai; Xu, Jiangang; Jiang, Xiaohong; Liu, Cun; McCall, Wesley; Lu, Junqiang

doi:10.1016/j.chemosphere.2017.06.040

Cited by 84 publications

(28 citation statements)

References 29 publications

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“…The immobilization efficiency of Cd(II) or As(V) was evaluated using the TCLP (Toxicity Characteristic Leaching Procedure) methods following the Environmental Protection Industry Standard of China. In brief, 1.0 g incubated soil sample was mixed with 20 mL of acetic acid solution (pH = 2.50) at a solution-to-solid ratio of 20:1 [39]. Mixtures were rationally shaken for 10 h at 200 rpm.…”

Section: Biochar Amendment On Cd-as Contaminated Soilmentioning

confidence: 99%

Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar

Wang

Zhang

et al. 2020

IJERPH

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Remediation of soil heavy metal by biochar has been extensively studied. However, few studies focused on the role of biochar on the co-immobilization of cadmium (Cd(II)) and arsenate (As(V)) and related soil nutrient availability. Remediation tests were conducted with three types of pristine and ferric trichloride (FeCl3) modified biochar (rice, wheat, and corn straw biochar) in Cd-As co-contaminated soil, with application rates of 1, 5, and 10% (w/w) and the incubation of 1, 7, 10, and 15 days. Using TCLP (Toxicity Characteristic Leaching Procedure) method, 10% of FeCl3 modified corn-straw derived biochar (FCB) had the highest immobilization efficiency of Cd(II) (63.21%) and As(V) (95.10%) after 10 days of the incubation. Iron-modified biochar immobilized higher fractions of water-soluble (F1) and surface-absorbed (F2) metal fractions than pristine biochar. For FCB amendment, Cd was mostly presented in the organic matter (OM) and sulfides associated (F4) and residual (F5) fractions (88.52%), as was found in the Fe-Al (oxides and hydroxides) (F3), F4, and F5 fractions (75.87%). FCB amendment increased soil pH values and available iron contents (p < 0.05), while no changes in soil available phosphorus content (p > 0.05). This study showed that FCB application reduces the environmental mobility of metals in Cd-As contaminated soil, while it also increases soil pH and available nutrient mobility, improving soil environmental quality and reducing remediation costs.

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Section: Biochar Amendment On Cd-as Contaminated Soilmentioning

confidence: 99%

Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar

Wang

Zhang

et al. 2020

IJERPH

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“…The enhanced chromium stabilization capacity of T-Monts and H-Monts was ascribed to the enlarged surface area and positively charged surface, respectively. Yu et al [106] investigated the interaction between organ-bentonite and the metals. It was found that the main interactive mechanisms for Cu, Zn, and Cd proceeded via cation exchange, Hg proceeded via physical adsorption and partitioning, and Cr and As proceeded via specific adsorption and electrostatic attraction, respectively.…”

Section: Bentonitementioning

confidence: 99%

Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review

2017

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Abstract:The safe disposal of sewage sludge during the process of municipal wastewater treatment has become one of the major concerns of increased production. Land application was thought of as a more economical method for sewage sludge disposal than landfill and incineration. However, the presence of heavy metals in sewage sludge restricted the use of land application. The environmental risk of heavy metals was dependent on their contents, chemical speciations, and soil characteristics. Composting and chemical immobilization were the commonly used methods to immobilize the heavy metals in sewage sludge. The immobilization mechanism and speciation transformation of heavy metals during the composting process were presented. Aluminosilicate, phosphorus-bearing materials, basic compounds, and sulfides were reviewed as the commonly used chemical immobilizing agents. The problems that occur during the immobilization process were also discussed. The combination of different methods and the modification of chemical immobilizing agents both improved the fixation effect on heavy metals.

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“…Modified zeolite effectively stabilized Pb, Cu, Zn and Cd in lake sediment to different extents [4]. Stabilization of Cu, Zn, Cd, Hg, Cr and As in soil using modified bentonites was performed by Yu et al [5]. Bentonites manifested distinct immobilization effectiveness towards various metals, proving that main interactive mechanisms proceeded via cation exchange, but also via physical adsorption and partitioning, Additionally, Liu et al [6] reported satisfying S/S treatment of heavy metal contaminated soils, and further investigated different influences on treatment efficiency.…”

Section: Introductionmentioning

confidence: 99%

Leachability and Microstructural Analysis of Clay and Lime Stabilized/Solidified Polluted Sediment – Long-Term Performance

Kerkez

Radjenovic

Pilipović

et al. 2019

Period. Polytech. Chem. Eng.

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The objective of this study is to enable a better understanding of the effectiveness of solidification/stabilization (S/S) technique in treating polluted sediment, and provide the much needed validation of the longevity of the technology. In this research kaolinite and montmorillonite, with a certain proportion of lime, were used for S/S treatment of sediment polluted with metals. Leachability of metals was examined using the toxicity characteristic leaching procedure (TCLP) and the German standard leaching test (DIN 3841-4 S4) prescribed in national legislative. Results indicated successful S/S treatment using both clays and lime, from the aspect of all leached metals even with pH variations over time and slight changes in structural integrity of specimens. X-ray diffraction (XRD), scanning electron microscope (SEM) analyses and porosity measurement were also performed on the prepared monolithic matrices. XRD qualitative and semi-quantitative analysis proved hydration and pozzolanic product formation with increase in their content and finer crystallites formation over time. SEM analysis confirmed the presence of morphologically dense and stable structures while pore size distribution indicated on mesoporous matrices with ongoing compaction over time. Generally, structural microanalysis indicated the formation of hardened matrices over time and hydration process has been fully completed and further carbonation took place. Unconfined compressive strength measurement gave the satisfying results and matured monolite with 30 % of montmorillonite and 10 % of lime can be considered potentially applicable as non-load-bearing material. In summary, all results indicated that this kind of S/S treatment can achieve satisfactory durability and represent reliable and economically feasible technique for long-term remediation of metal polluted sediment.

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Stabilization of heavy metals in soil using two organo-bentonites

Cited by 84 publications

References 29 publications

Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar

Simultaneous Immobilization of Soil Cd(II) and As(V) by Fe-Modified Biochar

Immobilization of Heavy Metals in Sewage Sludge during Land Application Process in China: A Review

Leachability and Microstructural Analysis of Clay and Lime Stabilized/Solidified Polluted Sediment – Long-Term Performance

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