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The beneficial reuse of contaminated sediment: Long-term assessment of fly ash and lime-based mixtures AITranslate

Dunja Rađenović; Đurđa Kerkez; Dragana Tomašević Pilipović; Miloš Dubovina; Miloš Šešlija; Slaven Tenodi; Igor Peško;
University of Novi Sad;University of Novi Sad;University of Novi Sad;University of Novi Sad;University of Novi Sad;University of Novi Sad;University of Novi Sad
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Publisher: Elsevier
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Abstract AITranslate

In recent decades, sediment has been recognised as a problematic resource due to its potentially harmful effects and the large quantities present in water bodies. There is a need to properly manage large quantities of dredged sediments so that they can be used as a resource and not necessarily treated as a waste product. This research investigates the effects of ageing and maturation of solidified/stabilized mixtures of contaminated sediment with fly ash and lime. The effects of ageing on the microstructural properties and chemical integrity of mixtures were studied for 7 days, 28 days, and 7 years using scanning electron microscopy and energy dispersive spectroscopy (SEM/EDS), X-ray diffraction analysis (XRD), and DIN (German Standard Procedure for Water, Wastewater and Sediment Testing (Group S)) and TCLP (Toxicity Characteristic Leaching Procedure) leaching tests. The results of the microstructure and strength analysis showed that the use of fly ash and lime as binders promoted the permanent structural integrity of the sediment. The treated sediment with 20 wt% fly ash and 10 wt% lime (F20L10) achieved higher overall strength compared to the mixture containing only 30 wt% fly ash (F30). The speciation and redistribution of metals and As in the treated sediment mixtures during the long-term evaluation indicate a strong reduction in their mobility. This material can be considered environmentally friendly and can be used as a fill material in road construction. The investment and operating costs are justified in this solution for sediment management. However, it is important to monitor the produced material over time to ensure that it remains effective and sustainable in the long term. Graphical Download : Download high-res image (184KB) Download : Download full-size image

KeyWords AITranslate

S/S solidification/stabilization solidification/stabilization CSH calcium silicate hydrates calcium silicate hydrates CASH calcium aluminium silicate hydrates calcium aluminium silicate hydrates F fly ash fly ash L lime lime F30 S/S sample as mixture of sediment with 30 wt% of fly ash S/S sample as mixture of sediment with 30 wt% of fly ash F20L10 S/S sample as mixture of sediment with 20 wt% of fly ash and 10%wt of lime S/S sample as mixture of sediment with 20 wt% of fly ash and 10%wt of lime RAC risk assessment code risk assessment code TCLP Toxicity Characteristic Leaching Procedure Toxicity Characteristic Leaching Procedure BET Brunauer Emmett and Teller Brunauer Emmett and Teller Sediment management Solidification/stabilization Longterm ageing Leaching Structural properties Treatment economy
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DOI：https://doi.org/10.1016/j.cscm.2023.e02711

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Citation Information:

In recent decades, sediment has been recognised as a problematic resource due to its potentially harmful effects and the large quantities present in water bodies. There is a need to properly manage large quantities of dredged sediments so that they can be used as a resource and not necessarily treated as a waste product. This research investigates the effects of ageing and maturation of solidified/stabilized mixtures of contaminated sediment with fly ash and lime. The effects of ageing on the microstructural properties and chemical integrity of mixtures were studied for 7 days, 28 days, and 7 years using scanning electron microscopy and energy dispersive spectroscopy (SEM/EDS), X-ray diffraction analysis (XRD), and DIN (German Standard Procedure for Water, Wastewater and Sediment Testing (Group S)) and TCLP (Toxicity Characteristic Leaching Procedure) leaching tests. The results of the microstructure and strength analysis showed that the use of fly ash and lime as binders promoted the permanent structural integrity of the sediment. The treated sediment with 20 wt% fly ash and 10 wt% lime (F20L10) achieved higher overall strength compared to the mixture containing only 30 wt% fly ash (F30). The speciation and redistribution of metals and As in the treated sediment mixtures during the long-term evaluation indicate a strong reduction in their mobility. This material can be considered environmentally friendly and can be used as a fill material in road construction. The investment and operating costs are justified in this solution for sediment management. However, it is important to monitor the produced material over time to ensure that it remains effective and sustainable in the long term. Graphical Download : Download high-res image (184KB) Download : Download full-size image

quote

GB/T 7714-2015 [1] Dunja Rađenović, Đurđa Kerkez, Dragana Tomašević Pilipović, et al. Case Studies in Construction Materials, 2024(20). DOI:10.1016/j.cscm.2023.e02711.
MLA [1] Dunja Rađenović, et al., Case Studies in Construction Materials, no. 20, 2024, https://doi.org/10.1016/j.cscm.2023.e02711.
APA [1] Dunja Rađenović, Đurđa Kerkez, Dragana Tomašević Pilipović, Miloš Dubovina, Miloš Šešlija, Slaven Tenodi, & Igor Peško. (2024). Case Studies in Construction Materials(20). https://doi.org/10.1016/j.cscm.2023.e02711
IEEE [1] Dunja Rađenović, Đurđa Kerkez, Dragana Tomašević Pilipović, Miloš Dubovina, Miloš Šešlija, Slaven Tenodi, and Igor Peško, Case Studies in Construction Materials, no. 20, 2024, doi: 10.1016/j.cscm.2023.e02711. keywords: {S/S solidification/stabilization;solidification/stabilization;CSH calcium silicate hydrates;calcium silicate hydrates;CASH calcium aluminium silicate hydrates;calcium aluminium silicate hydrates;F fly ash;fly ash;L lime;lime;F30 S/S sample as mixture of sediment with 30 wt% of fly ash;S/S sample as mixture of sediment with 30 wt% of fly ash;F20L10 S/S sample as mixture of sediment with 20 wt% of fly ash and 10%wt of lime;S/S sample as mixture of sediment with 20 wt% of fly ash and 10%wt of lime;RAC risk assessment code;risk assessment code;TCLP Toxicity Characteristic Leaching Procedure;Toxicity Characteristic Leaching Procedure;BET Brunauer Emmett and Teller;Brunauer Emmett and Teller;Sediment management;Solidification/stabilization;Longterm ageing;Leaching;Structural properties;Treatment economy}