Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/36045
Title: Mixture design and treatment methods for recycling contaminated sediment
Authors: Wang, L
Kwok, JSH
Tsang, DCW 
Poon, CS 
Keywords: Carbon dioxide curing
Contaminated sediment
Stabilization/solidification
Thermal pretreatment
Waste recycling
Issue Date: 2015
Publisher: Elsevier
Source: Journal of hazardous materials, 2015, v. 283, p. 623-632 How to cite?
Journal: Journal of hazardous materials 
Abstract: Conventional marine disposal of contaminated sediment presents significant financial and environmental burden. This study aimed to recycle the contaminated sediment by assessing the roles and integration of binder formulation, sediment pretreatment, curing method, and waste inclusion in stabilization/solidification. The results demonstrated that the 28-d compressive strength of sediment blocks produced with coal fly ash and lime partially replacing cement at a binder-to-sediment ratio of 3:7 could be used as fill materials for construction. The X-ray diffraction analysis revealed that hydration products (calcium hydroxide) were difficult to form at high sediment content. Thermal pretreatment of sediment removed 90% of indigenous organic matter, significantly increased the compressive strength, and enabled reuse as non-load-bearing masonry units. Besides, 2-h CO2 curing accelerated early-stage carbonation inside the porous structure, sequestered 5.6% of CO2 (by weight) in the sediment blocks, and acquired strength comparable to 7-d curing. Thermogravimetric analysis indicated substantial weight loss corresponding to decomposition of poorly and well crystalline calcium carbonate. Moreover, partial replacement of contaminated sediment by various granular waste materials notably augmented the strength of sediment blocks. The metal leachability of sediment blocks was minimal and acceptable for reuse. These results suggest that contaminated sediment should be viewed as useful resources.
URI: http://hdl.handle.net/10397/36045
ISSN: 0304-3894
EISSN: 1873-3336
DOI: 10.1016/j.jhazmat.2014.09.056
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