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Advisor(s)
Abstract(s)
The periodical cleaning of the decanters at the plant generates solid wastes called water treatment sludges (WTS), a chemical compound similar to aluminum silicates. WTS’s properties have been studied for geotechnical purpose and it seems to be suitable for producing liner materials for landfills, dams, ponds, and lagoons which store and prevent soil’s infiltration of residues. Liners are usually shaped of soil and geosynthetics, their main properties required are compaction, compressibility and shear strength, chemical compatibility, and hydraulic conductivity. WTS to be considered as a soil substitute, it must be function like a soil, thus, for developing alternative materials, physical, chemical, mechanical, and hydraulic characterization laboratorial parameters are the first step to make viable its reuse. In this sense, the study aims to review the literature over the above-mentioned parameters in order to evaluate WTS as liner material. This review concluded that WTS have high heterogeneity in chemical and mechanical behavior due source of water and treatment processes. WTS’ water affinity affects plasticity behavior, and its incorporation into soils seems to contribute for a composite with pozzolanic characteristics, low specific gravity, finer granulometry, and mechanical stabilization. Although need attention on its chemical compatibility, the influence on shear resistance—increasing internal effective friction angle and decreasing cohesion—and the optimum ratio of introduction within soils for an alternative liner material. Nonetheless, there are lacks in literature over hydraulic conductivity, and long-term behavior, the use of the material in practice must be preceded by pilot tests or experimental landfills.
Description
Keywords
Water treatment sludge Waterproofing Liner Geotechnical material Review
Citation
Marchiori, L., Albuquerque, A., Cavaleiro, V. (2023). Water Treatment Sludge as Geotechnical Liner Material: State-of-Art. In: Yukselen-Aksoy, Y., Reddy, K.R., Agnihotri, A.K. (eds) Sustainable Earth and Beyond. EGRWSE 2022. Lecture Notes in Civil Engineering, vol 370. Springer, Singapore. https://doi.org/10.1007/978-981-99-4041-7_47
Publisher
Springer Nature