Leaching Characteristics of Heavy Metals from Solidified Sludge Under Seawater Conditions

Shin, Hang‐Sik; Koo, Joonhoi; Kim, Jong‐Oh; Yoon, Seok-Pyo

doi:10.1089/hwm.1990.7.261

Cited by 8 publications

(3 citation statements)

References 3 publications

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“…Molecular diffusion is unlikely for the observed Cu in the leachate even with the maximum Cu concentration gradient across the boundary of the solid matrix and the acetic acid because the permeability of the cement-based matrix is as low as 10" 5 cm/s to 10" 9 cm/s [12]. Several studies have reported that the leaching of cement-based wastes with water will not cause any noticeable "damage" to the solidified wastes [1,3,13,14]. Nevertheless, leaching becomes quite evident when acidic solution is imposed on the solid matrix.…”

Section: Discussionmentioning

confidence: 99%

Leaching processes of the dicalcium silicate and copper oxide solidification/stabilization system

Lin

Huang

1994

Toxicological & Environmental Chemistry

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Cement based solidification/stabilization technology has been widely practiced for the treatment of inorganic hazardous wastes, especially metal-bearing wastes. The advantage of using the solidification/stabilization process is that the mobility of the hazardous materials is greatly retarded in the final disposal sites. The purpose of this study is to assess the stability of a synthetic solid waste through the renewable leaching test. A major cement constituent, dicalcium silicate (C 2 S), was used as a model binder to react with copper oxide to form a solid waste matrix. The semi-dynamic leaching test using 1 N acetic acid was employed to investigate the leaching characteristics of the C 2 S/CuO system. The results show that the dissolution of Ca(OH) 2 is the primary mechanism for the destruction of the matrix, and the subsequent leaching of copper ion. The surfacecontrolled dissolution reaction increases the pore size and porosity of the matrix, thus increasing the diffusion rate of copper ion transport. The C 2 S hydration product, silicate hydrate, might play a role in adsorbing the copper ion in the leaching system.

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Section: Discussionmentioning

confidence: 99%

Leaching processes of the dicalcium silicate and copper oxide solidification/stabilization system

Lin

Huang

1994

Toxicological & Environmental Chemistry

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“…Besides water or other solvents e.g., citric acid, to simulate the effect of soil acids or of acid rain [82][83][84][85]. Leaching tests can also be used for durability testing, although they do not reflect in all cases the real situation, where a bulky structure is attacked instead of a powder [77,[86][87][88][89][90]. Amal et al investigated the microstructure of cementitious wastes containing different metal ions like Pb, Cd, As and Cr and examined the implications of the microstructure on the leaching of the heavy metal ions [91].…”

Section: Fixation Of Heavy Metals In Portland Cementmentioning

confidence: 99%

Environmental Pollution Remediation through Solidification/Fixation of Heavy Metal Ions in Portland Cement

Goyal¹,

Chauhan²

2015

J Environ Anal Toxicol

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“…Bishop [6] has investigated the leaching behaviors of synthetic metal hydroxide sludges containing Cd (0.2 M), Cr (0.46 M) and Pd (0.11 M) solidified by OPC and discussed the possible mechanisms of metal binding. Other authors [7][8][9] have reported the leaching characteristics of cadmium and cadmium containing sludges doped in OPC and fly ash blended OPC, under different leaching conditions. More recent work by Roy et al [10] have used SEM, EDX, optical spectroscopy and XRD to evaluate the mechanisms of Solidification/Stabilization (S/S) of heavy metal sludges containing Cd, Cr, Hg and Ni by OPC/fly ash binders.…”

Section: Introductionmentioning

confidence: 99%

An FTIR investigation of cement based solidification/stabilization systems doped with cadmium

Mollah

Tsai

Cocke

1992

Journal of Environmental Science and Health . Part A: Environme

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Solidification/Stabilization (S/S) of cadmium by Portland Type V cement (OPC) and its leaching mechanism have been investigated by Fourier Transform Infrared Spectroscopy (FTIR). Effects of carbonation on cadmium S/S systems have also been investigated. Evidence is presented from FTIR results that the hydration of OPC is retarded due to the formation of calcium hydroxycadmiates, which result from the surface reaction of [Cd(OH) 4 ] 2-with calcium ions at or on the surface of the cement grains. Considerable insight has been gained concerning the nature of hydration reactions in the presence of carbon dioxide and in its absence. The results reveal the nature of the hydroxylated surface compounds formed by cadmium -doped Portland cement. Carbonation has been found to play an important role in the hydration and polymerization of silicates. The leaching process leads to higher degree of polymerization of the silicate components due to the attack of C-S-H by the acidic leaching solution. This is facilitated by the dissolution of calcium hydroxide, sulfates and cadmium complexes from the surface of the cement grains. † Visiting Professor,

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Leaching Characteristics of Heavy Metals from Solidified Sludge Under Seawater Conditions

Cited by 8 publications

References 3 publications

Leaching processes of the dicalcium silicate and copper oxide solidification/stabilization system

Leaching processes of the dicalcium silicate and copper oxide solidification/stabilization system

Environmental Pollution Remediation through Solidification/Fixation of Heavy Metal Ions in Portland Cement

An FTIR investigation of cement based solidification/stabilization systems doped with cadmium

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