Beneficial Use of Water Treatment Sludge in Geotechnical Applications as a Sustainable Alternative to Preserve Natural Soils

Autor(es)

Boscov, Maria E. G. ^[1] ; Tsugawa, Juliana K. ^[1] ; Montalvan, Edy L. T. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Engn, Struct & Engn Dept, BR-05508970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SUSTAINABILITY; v. 13, n. 17 SEP 2021.
• Citações Web of Science: 0

Resumo

This paper explores the feasibility of employing drinking water treatment sludge (WTS) mixed with soils, lime, or rock powder in geotechnical applications, as well as discusses the sustainability of the approach based on experimental results, aiming at the beneficial reuse of waste and the preservation of natural geomaterials. The selected materials were two soils largely used in earthworks, two WTSs, a high purity calcium hydrated lime, and rock powder from a granitic-gneissic quarry, all occurring in Sao Paulo State, Brazil. The mixtures were chemically, mineralogically, and geotechnically characterized, and the geotechnical properties permeability, shear strength, and deformability were investigated. Soil-WTS mixtures showed hydraulic conductivity (10(-10)-10(-6) m/s, depending on soil and WTS), effective cohesion (10-30 kPa), friction angle (34 degrees-40 degrees), undrained strength (>50 kPa), and compression index (0.1-0.4) compatible with those of soils usually employed in earthworks. Lime:WTS and rock powder:WTS mixtures achieved 50 kPa undrained strength for WTS contents lower than 24% and 8%, respectively, and could be used as daily and intermediate covers of waste landfills, as well as in other applications with low soliciting stresses. The possibility of WTS being pumped instead of transported by trucks was analyzed in the light of results from rheological tests. (AU)

• Processo FAPESP: 13/50448-8 - Viabilização da utilização do lodo de ETA como material de cobertura de aterros sanitários e na construção de aterros em solos compactados
• Beneficiário: Maria Eugenia Gimenez Boscov
• Modalidade de apoio: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE
• Processo FAPESP: 19/17183-7 - Comportamento geotécnico de misturas do solo arenoso de Botucatu com o lodo da estação de tratamento de água Taiaçupeba, município de Suzano, São Paulo
• Beneficiário: Aline Roque da Silva
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 17/24056-6 - Comportamento geotécnico de misturas de solos tropicais paulistas com lodo de estação de tratamento de água
• Beneficiário: Edy Lenin Tejeda Montalvan
• Modalidade de apoio: Bolsas no Brasil - Doutorado