Modified granulation of red mud by weak gelling and its application to stabilization of Pb

Luo, Huimin; Huang, Shengsheng; Luo, Lin; Wu, Genyi; Liu, Yan

doi:10.1016/j.jhazmat.2012.05.046

Cited by 15 publications

(9 citation statements)

References 27 publications

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“…Anthropogenic activities such as smelting, the use of leaded gasoline and various industrial processes have increased the lead accumulation in soil. A number of studies have been conducted on remediation of lead contaminated soil using different soil amendments such as phosphate sources (phosphoric acid, rock phosphate, super phosphate) (Cao et al, 2008, Ma et al, 1995, Barth et al, 2005, apatite (Xu andSchwartz, 1994, Laperche et al, 1996), lime, phosphogypsum, red gypsum, dolomitic residues (Rodriguez-Jorda et al, , Illera et al, 2004, Garrido et al, 2005, red mud (Luo et al, 2012) compost (Hashimoto et al, 2011) and blast furnace slag (Barth and Sass, 2007). Among these treatments, phosphorous (P) sources are the most effective treatment in stabilizing Pb by forming pyromorphite, which is one of the most stable Pb compounds in soil (Scheckel et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Alterations of lead speciation by sulfate from addition of flue gas desulfurization gypsum (FGDG) in two contaminated soils

Koralegedara

Al-Abed

Rodrigo

et al. 2017

Science of The Total Environment

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This is the first study to evaluate the potential application of FGDG as an in situ Pb stabilizer in contaminated soils with two different compositions and to explain the underlying mechanisms. A smelter Pb contaminated soil (SM-soil), rich in ferrihydrite bound Pb (FH-Pb), cerussite and litharge with a total Pb content of 65,123mg/kg and an organic matter rich orchard soil (BO-soil), rich in FH-Pb and humic acid bound Pb with a total Pb content of 1532mg/kg were amended with 5% FGDG (w/w). We subjected the two soils to three leaching tests; toxicity characteristic leaching protocol (TCLP), synthetic precipitation leaching protocol (SPLP), kinetic batch leaching test (KBLT) and in-vitro bioaccessibility assay (IVBA) in order to evaluate the FGDG amendment on Pb stabilization. Solid residues of original and FGDG amended soil were analyzed using X-ray absorption spectroscopy (XAS) to identify changes in Pb speciation after each leaching test. The leachate Pb concentrations of FGDG amended soil were lower compared to those of in non-amended soil. The linear combination fitting analysis of XAS confirmed the formation of anglesite and leadhillite in FGDG amended soil. FGDG reduced the Pb desorption from ferrihydrite (FH), by forming FH-Pb-SO ternary complexes. FGDG decreased the Pb adsorption onto humic acid (HA) possibly due to the release of divalent cations such as Ca and Mg, which can compete with Pb to get adsorbed onto HA. The FGDG can successfully be used to remediate Pb contaminated soil. The efficiency of the treatment highly depends on the soil composition.

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Section: Introductionmentioning

confidence: 99%

Alterations of lead speciation by sulfate from addition of flue gas desulfurization gypsum (FGDG) in two contaminated soils

Koralegedara

Al-Abed

Rodrigo

et al. 2017

Science of The Total Environment

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“…In some studies , a proportionate amount of various materials were used in granulation process to improve adsorption capacity. Recently, Luo et al used weak gel as a cementitious material to granulate red mud. Some studies reported the agglomeration of granular TiO 2 :TiO 2 /montmorillonite , TiO 2 /nanocrystalline anatase adsorbents to remove arsenic species from water.…”

Section: Granulation‐prospective and Opportunitiesmentioning

confidence: 99%

Arsenic Removal from Natural Water Using Low Cost Granulated Adsorbents: A Review

Baig

Sheng

et al. 2014

CLEAN Soil Air Water

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Elevated arsenic concentrations have been detected in drinking water sources worldwide and it threatens to over 200 million people in both developing and developed countries. Adsorption is a conventional process for arsenic removal from contaminated water. Several classes of adsorbing materials have been tested so far. However, far less attention was paid towards granular‐based adsorption and granulation processes. The present work is the first attempt to consider both the granular adsorbent and the granulation process. A particular emphasis was given to cost‐efficient adsorbent for small scale arsenic removal. Some of the features of granular adsorbents are summarized in tables and graphs; address necessary outlines for readers to easily overview the adsorbents' characteristics and design sustainable adsorption system. Earlier, cost of arsenic removals from granular adsorbents were not widely affirmed, but in this review few of them are incorporated for comparisons in future studies. Thus, one gram of arsenic removal from water using novel and iron oxide‐coated sand adsorbents is approximately ranged US$2.3–5.1 and US$3.3–4.2, respectively. Moreover, methods employed for regeneration of exhausted granular adsorbents are discussed. Field scale arsenic remediation measures and the performance evaluations are additionally reported to identify the feasibility of these approaches for scaling up, awareness raising and promotion.

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“…Granulation is associated with the cutting or shredding a large object into small granules or compressing of fine powders to create bonds between them to form granules [10]. For instance, weak gel was applied as a binding agent to make red mud granules [11]. In our previous study [12], the composite material containing Fe 3 O 4 and SiO 2 as the major constituents unexpectedly transformed into a new phase with larger granules during high temperature calcination under nitrogen environment.…”

Section: Introductionmentioning

confidence: 99%

Characterization of magnetic biochar amended with silicon dioxide prepared at high temperature calcination

Baig

Lou

Hayat

et al. 2016

Materials Science-Poland

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Calcination is considered to increase the hardness of composite material and prevent its breakage for the effective applications in environmental remediation. In this study, magnetic biochar amended with silicon dioxide was calcined at high temperature under nitrogen environment and characterized using various techniques. X-ray diffraction (XRD) analysis revealed elimination of Fe 3 O 4 peaks under nitrogen calcination and formation of Fe 3 Si and iron as major constituents of magnetic biochar-SiO 2 composite, which demonstrated its superparamagnetic behavior (>80 Am 2 ·kg −1 ) comparable to magnetic biochar. Thermogravimetric analysis (TGA) revealed that both calcined samples generated higher residual mass (>96 %) and demonstrated better thermal stability. The presence of various bands in Fourier transform infrared spectroscopy (FT-IR) was more obvious and the elimination of H-O-H bonding was observed at high temperature calcination. In addition, scanning electron microscopy (SEM) images revealed certain morphological variation among the samples and the presence of more prominent internal and external pores, which then judged the surface area and pore volume of samples. Findings from this study suggests that the selective calcination process could cause useful changes in the material composites and can be effectively employed in environmental remediation measures.

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Modified granulation of red mud by weak gelling and its application to stabilization of Pb

Cited by 15 publications

References 27 publications

Alterations of lead speciation by sulfate from addition of flue gas desulfurization gypsum (FGDG) in two contaminated soils

Alterations of lead speciation by sulfate from addition of flue gas desulfurization gypsum (FGDG) in two contaminated soils

Arsenic Removal from Natural Water Using Low Cost Granulated Adsorbents: A Review

Characterization of magnetic biochar amended with silicon dioxide prepared at high temperature calcination

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