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Title: Green remediation of contaminated sediment by stabilization/solidification with industrial by-products and CO2 utilization
Authors: Wang, L 
Chen, L 
Tsang, DCW 
Li, JS 
Yeung, TLY 
Ding, SM
Poon, CS 
Keywords: Waste valorization
Cleaner production
Sediment remediation
Carbon sequestration
CO2 curing
Eco-paving blocks
Issue Date: 2018
Publisher: Elsevier
Source: Science of the total environment, 1 Aug. 2018, v. 631-632, p. 1321-1327 How to cite?
Journal: Science of the total environment 
Abstract: Navigational dredging is an excavation of marine/freshwater sediment to maintain channels of sufficient depth for shipping safety. Due to historical inputs of anthropogenic contaminants, sediments are often contaminated by metals/metalloids, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, and other contaminants. Its disposal can present significant environmental and financial burdens. This study developed a novel and green remediation method for contaminated sediment using stabilization/solidification with calcium-rich/lowcalcium industrial by-products and CO2 utilization. The hydration products were evaluated by quantitative X-ray diffraction analysis and thermogravimetric analysis. The incorporation of calcium carbide residue (CCR) facilitated hydration reaction and provided relatively high 7-d strength. In contrast, the addition of Class-F pulverized fly ash (PEA) and ground granulated blast furnace slag (GGBS) was beneficial to the 28-d strength development due to supplementary pozzolanic and hydration reactions. The employment of 1-d CO2 curing was found to promote strength development (98%) and carbon sequestration (4.3 wt%), while additional 7-d air curing facilitated cement rehydration and further carbonation in the sediment blocks. The leachability tests indicated that all studied binders, especially CCR binder, effectively immobilized contaminants in the sediments. The calcium-rich CCR and GGBS were regarded as promising candidates for augmenting the efficacy of CO2 curing, whereas GGBS samples could be applicable as eco-paving blocks in view of their superior 28-d strength. This study presents a new and sustainable way to transform contaminated sediment into value-added materials.
ISSN: 0048-9697
EISSN: 1879-1026
DOI: 10.1016/j.scitotenv.2018.03.103
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