Abstract
This article is about an alternative recovery of sludge from Sewage Treatment Plant (STP) and Water Treatment Plant (WTP) through its use as landfill cover. The use of sewage sludge as alternative cover material is common in some countries and has several advantages: cost savings in the purchase of material cover, as well as, sludge disposal; improvement in the quality of leachate; nutrients supply for vegetative cover (top soil), among others. In this study, two different sludges were tested and both were initially physical-chemical and bacteriological characterized and subsequently stabilized with 15% of lime (CaO), to reach the environmental requirements to use as landfill cover. Following the study, these treated sludge were mixed with clay soil at 1:1 ratio (soil: sewage sludge and water treatment sludge stabilized) and the geotechnical characteristics of this mixture were compared with natural soil and with the recommended values from literature. The results indicate that the combination of sludge from STP and WTP, chemically treated with lime, has potential for use in landfill covers. Key words: solid waste, sewage sludge, landfill, landfill cover, geotechnical evaluation.
Highlights
Utilização de lodo de Estação de Tratamento de Água (ETA) e Estação de Tratamento de Esgoto (ETE) como material alternativo de cobertura de aterro sanitário Armando Borges de Castilhos Junior, Elivete Carmem Clemente Prim, Francisco José Guedes Pimentel
Two different sludges were tested and both were initially physical-chemical and bacteriological characterized and subsequently stabilized with 15% of lime (CaO), to reach the environmental requirements to use as landfill cover
The results indicate that the combination of sludge from Sewage Treatment Plant (STP) and Water Treatment Plant (WTP), chemically treated with lime, has potential for use in landfill covers
Summary
Os sistemas de cobertura são constituintes fundamentais dos aterros sanitários e objetivam reduzir a geração de lixiviado, a atração de vetores, a dispersão de gases e odores, dentre outras funções. O resíduo sólido lodo mais relevante em termos de quantidade e de volume nas Estações de Tratamento de Esgotos (ETEs) e de Água (ETAs) – tem sido estudado como materiais alternativos em diferentes áreas da engenharia. O lodo de água apesar de não ter sido até o presente alvo de estudos como material de cobertura tem sido aproveitado em outras áreas de engenharia que indicam também poder ser usado para este fim. O lodo de ETA pode possuir uma característica mais similar aos solos do que se comparado com o lodo de esgoto. Conforme Tsutiya e Hirata (2001), as características físicas e químicas de lodos de ETA's são similares às características da argila natural e do xisto sendo que a argila natural é o material mais comumente usado em coberturas de aterros sanitários
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