Evaluation of Leaching Tests for Cement Based Immobilization of Hazardous Compounds

Leist, M.; Casey, R. John; Caridi, Domenico

doi:10.1061/(asce)0733-9372(2003)129:7(637)

Cited by 14 publications

(8 citation statements)

References 5 publications

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“…The presence of CaHAsO 4 and CaHAsO 4 ·2H 2 O may account for the negligible amount of arsenic that leached out from the matrices [38]. From these findings, it may be rightly stated that formation of Ca-As precipitates is one of the predominant mechanism responsible for As(III) immobilization in the sludge for the present study as also found by various researchers [11,18,35,39,40]. One of the main reasons of better arsenic immobilization in the cement-based S/S matrices could be due to the alkaline nature and buffering capacity provided by calcium hydroxide and the calcium silicate hydrates [41].…”

Section: Leachability Indexsupporting

confidence: 57%

Immobilization and leaching characteristics of arsenic from cement and/or lime solidified/stabilized spent adsorbent containing arsenic

Kundu

Gupta

2008

Journal of Hazardous Materials

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Section: Leachability Indexsupporting

confidence: 57%

Immobilization and leaching characteristics of arsenic from cement and/or lime solidified/stabilized spent adsorbent containing arsenic

Kundu

Gupta

2008

Journal of Hazardous Materials

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“…Accordingly, the leachability of the waste is reduced and the final product is easier to handle and transport. Among the various types of binders used for the s/s process, cement-based systems have been widely used to minimize leaching of contaminants from hazardous wastes (Cheng and Bishop, 1996;Poon et al, 2001;Zhang and Bishop, 2002;Leist et al, 2003). Pulverized fuel ash (PFA), a byproduct of coal-fired power generation, is often incorporated into the cement-based s/s process to reduce costs (Connor, 1990;Ubbriaco and Calabrese, 1998;Mollamahmutolu and Yilmaz, 2001).…”

Section: Introductionmentioning

confidence: 98%

Feasibility of Using Reject Fly Ash in Cement-Based Stabilization/Solidification Processes

Poon

Qiao

Cheeseman

et al. 2006

Environmental Engineering Science

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Stabilization/solidification (s/s) has been routinely used for the final treatment of hazardous wastes prior to land disposal. These processes involve adding one or more solidifying reagents into the waste to transform it into a monolithic solid with improved structural integrity. Cement-based systems with partial replacement by pulverized fuel ash (PFA) have been widely used to minimize leaching of contaminants from hazardous wastes. The finer fraction of PFA (Ͻ45 m, fine fly ash, fFA), produced by passing the raw ash through a classifying process is commonly used in s/s processes. Low-grade fly ash is rejected (rFA) from the ash classifying process, and is largely unused due to high carbon content and large particle size but represents a significant proportion of PFA. This paper presents experimental results of a study that has assessed the feasibility of using rFA in the cement-based s/s of a synthetic heavy metal waste. Results were compared to mixes containing fFA. The strength results show that cement-based waste forms with rFA replacement are suitable for disposal at landfill and that the addition of heavy metal sludge can increase the degree of hydration of fly ash and decrease the porosity of samples. Adding Ca(OH) 2 and flue gas desulphurization sludge reduces the retarding effect of heavy metals on strength development. The results of the Toxicity Characteristic Leaching Procedure and Dynamic Leach Test show that rFA can be used in cement-based s/s wastes without compromising performance of the product.

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“…With the assumption of a constant diffusion co-efficient, the diffusion flux (J) across the solid/solution interface can be expressed [5] as…”

Section: Mathematical Formulation For the Determination Of Rate Of Lementioning

confidence: 99%

“…This hydration by-product not only has a direct influence on strength of the solidified matrices but also potentially has a hand in waste immobilization [10]. Solidification of arsenicladen or other heavy metal-laden solid waste with cement is a suitable technique to reduce leachability of those metals [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Other objectives of solidification and stabilization processes are, of course, the production of a monolithic solid mass and the improvement of the handling and physical characteristics of the waste [3]. Cement-based solidification/stabilization technology currently provides the most promising solution for the disposal of arsenic wastes [5]. Solidification/stabilization with Portland cement is often suggested as the best treatment for wastes that cannot be reduced or recycled [6,7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessing arsenic leachability from pulverized cement concrete produced from arsenic-laden solid CalSiCo-sludge

Bhunia

Pal

Bandyopadhyay

2007

Journal of Hazardous Materials

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Evaluation of Leaching Tests for Cement Based Immobilization of Hazardous Compounds

Cited by 14 publications

References 5 publications

Immobilization and leaching characteristics of arsenic from cement and/or lime solidified/stabilized spent adsorbent containing arsenic

Immobilization and leaching characteristics of arsenic from cement and/or lime solidified/stabilized spent adsorbent containing arsenic

Feasibility of Using Reject Fly Ash in Cement-Based Stabilization/Solidification Processes

Assessing arsenic leachability from pulverized cement concrete produced from arsenic-laden solid CalSiCo-sludge

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