Green remediation and recycling of contaminated sediment by waste-incorporated stabilization/solidification

Wang, Lei; Tsang, Daniel C.W.; Poon, Chi Sun

doi:10.1016/j.chemosphere.2014.11.071

Cited by 109 publications

(23 citation statements)

References 36 publications

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“…Lower mechanical performances are also obtained when lower quantities (60-70%) of fine sediments are substituted in mortars, with a lower cement proportion of 15-20%, even if the W/C is kept low at close to 0.6. In this case, the UCS reached 1.2-2.1 MPa (Wang et al, 2015). However, for a non-structural purpose such as a pavement base, mechanical requirements are not high.…”

mentioning

confidence: 86%

“…In the case of a valorization process, cement proportions are usually higher to improve the mechanical behavior, and admixtures can be added to improve durability or other formulation parameters such as workability. Dredged sediments can fully substitute for sand aggregate (Ben Allal et al, 2011;Yan et al, 2014), as well as be used in partial substitution with co-valorization of other solid wastes (Wang et al, 2015). Another possibility is to use dredged sediments as a fine granular corrector with a coarser aggregate (Limeira et al, 2011(Limeira et al, , 2010.…”

Section: Introductionmentioning

confidence: 99%

“…7. Another study on solidified sediments observed that the increase in total pore area and average pore diameter are linearly correlated with the decrease in compressive strength (Wang et al, 2015).…”

mentioning

confidence: 96%

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Feasibility of the reuse of total and processed contaminated marine sediments as fine aggregates in cemented mortars

Couvidat

Benzaazoua

Chatain

et al. 2016

Construction and Building Materials

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In a context promoting waste sustainable management, dredged sediments are assessed for valorization as substitute for sand in non-structural cemented mortars. Full substitution of sand by total sediment revealed low mechanical performances at UCS testing, linked to a high porosity. However, mechanical strength was improved, and porosity reduced, by using 80µmsized sediment. Thus, porosity is correlated to the presence of a fine fraction and its constitution, which brought a higher water demand during formulation. This research confirmed that the reuse of the coarser fraction of a marine sediment offered an interesting valorization potential as cemented mortars for non-structural applications.

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mentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Feasibility of the reuse of total and processed contaminated marine sediments as fine aggregates in cemented mortars

Couvidat

Benzaazoua

Chatain

et al. 2016

Construction and Building Materials

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“…Over the years mixtures became more compact indicating on pozzolanic reactions taking place and creating discernible metal -bearing phases. Silica gel and C-S-H gel appears as porous fibers whereas calcite appears as equant grains [18,19]. X-ray diffraction is a non-destructive method which determines the composition of samples, precisely, fractions of amorphous and crystalline phases, phase transformations.…”

Section: Resultsmentioning

confidence: 99%

Long-term performance of stabilised/solidified polluted sediment in terms of metal leachability and matrix characterization

Radjenovic¹,

Kerkez²,

Pilipovic-Tomasevic³

et al. 2017

Zas Mat

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Sustainable and economically feasible polluted sediment treatment is gaining more and more importance. Stabilization/solidification (S/S) technologies are widely used for treatment of sediment and possibilities of using low-cost and readily available materials and binders are increasingly being examined. This work is concerned with aquairing more data about long-term performance of this kind of treatment in therms of metal leaching and microstructural cnaracterization when treating sediment with fly ash and lime. Extraction potential of metals and the effectiveness of the S/S treatment applied, together with compliance with national legislative, were performed by using Toxicity Characteristic Leaching Procedure-TCLP and The German standard leaching test-DIN 3841-4 S4. Leaching test results showed that the applied S/S treatment was effective in immobilizing metals even after seven years of aging. Scanning electron microscope (SEM) and X-ray diffraction analysis confirmed that pozzolanic reactions took place during 28 days and continued along S/S mixture maturation. Compressive strength measurement further proved the treatment efficacy in terms of obtained matrix stability, which enables their subsequent use. It can be concluded that the S/S technique, with the usage abundant materials has a significant potential for treatment of metal polluted sediment.

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“…The sludge deposited in waterways such as urban ditches, rivers, lakes and seas, hinders navigation, worsens water quality and thus requires regular dredging [1]. Dredged sludge exposed to the atmosphere in yards produces pollution to the surrounding water and soil, occupies a large amount of land resources, and raises dredging project cost at the same time [2][3][4][5][6][7][8]. Solidification/Stabilization (S/S) technology through cement and other solidification agents, transfers dredged sludge into engineering fillers (S/S sludge), so as to promote the large-scale utilization of dredged sludge, which has many social and economic values, such as environmental protection, cost saving and so on.…”

Section: Introductionmentioning

confidence: 99%

Solidification of High Organic Matter Content Sludge by Cement, Lime and Metakaolin

Ke¹,

Wang

Tan³

et al. 2018

Period. Polytech. Civil Eng.

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Based on orthogonal experimental design, the key solidification controlling technology of Solidified/Stabilized (S/S) sludge with high total organic content (TOC) by cement, lime and metakaolin was explored by macroscopic tests, chemical components measurements and microscopic analysis. The macroscopic tests show that, the permeability coefficient is mainly affected by initial water content and lime content, and the unconfined compression strength is mainly affected by cement content and lime content. The chemical components measurements show that, the solidification effect of S/S sludge with high TOC is controlled by organic matter consumption, and organic matter consumption is determined by the alkaline environment from the cement and lime hydration reactions, which is mainly affect by the initial water content and lime-metakaolin content ratio. The microscopic analysis results show that, lime consumes parts of organic matter while excess lime produces weak Ca(OH)2 crystal fluffy sheet structure, matakaolin produces pozzolanic reactions with cement and lime instead of soil particles, and consumes the weak Ca(OH)2 crystal fluffy sheet structure produced by superfluous lime. The research has confirmed key controlling points of S/S sludge in case of high TOC, which will provide theoretical guidance and technical support for S/S sludge promotion with high TOC.

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Green remediation and recycling of contaminated sediment by waste-incorporated stabilization/solidification

Cited by 109 publications

References 36 publications

Feasibility of the reuse of total and processed contaminated marine sediments as fine aggregates in cemented mortars

Feasibility of the reuse of total and processed contaminated marine sediments as fine aggregates in cemented mortars

Long-term performance of stabilised/solidified polluted sediment in terms of metal leachability and matrix characterization

Solidification of High Organic Matter Content Sludge by Cement, Lime and Metakaolin

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