Dewatering of sludge from a water treatment plant in geotextile closed systems

Guimarães, M. G. A.; Urashima, D. C.; Vidal, Delma de Mattos

doi:10.1680/gein.14.00018

Cited by 29 publications

(16 citation statements)

References 15 publications

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“…Dentre os polieletrólitos, em geral, os aniônicos são mais eficazes na desidratação (Fernandes, 2002apud Haak, 2011. Contudo, na atualidade, estudos apontam que o grau de desidratação está intimamente ligado ao tipo de lodo gerado e de polímero aplicado, bem como à sua dosagem, à otimização de sua concentração, ao tempo de mistura e gradiente de velocidade (Guimarães et al, 2014;Haak, 2011). Sendo assim, as propriedades ótimas do polímero devem ser determinadas por meio de testes de pequena escala (Maurer et al, 2012).…”

Section: Condicionamento Químicounclassified

“…Um dos maiores desafios no correto manejo de resíduos gerados em ETAs é a diminuição dos volumes a serem dispostos (Achon et al, 2008). Devido à alta concentração de líquido em relação à concentração de sólidos e sua elevada resistência à filtração, às vezes torna-se necessário condicioná-los, promovendo a formação de flocos e consequente liberação da água adsorvida (Guimarães et al, 2014;Reali et al, 1999).…”

Section: Introductionunclassified

“…Uma maneira rápida e econômica de analisar preliminarmente o condicionante e a dosagem a serem empregados é o emprego do método do ensaio de cone (Guimarães et al, 2014), metodologia encontrada em Lawson (2008). Sendo assim, o objetivo deste estudo é avaliar o condicionamento químico do lodo de uma ETA usando-se polímeros orgânicos, por meio do ensaio de cone.…”

Section: Introductionunclassified

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Análise do Condicionamento Químico de Resíduos com Alto Teor de Líquido por Ensaio de Cone: Estudo de Caso com Lodo de ETA

Scalioni

Urashima

Guimarães

2020

BJD

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Resíduos com alto teor de líquido em relação ao teor de sólidos em sua constituição, como lodos de Estação de Tratamento de Água (ETA), podem ser submetidos a técnicas de desaguamento visando à redução de seu volume para posterior disposição. Devido à resistência deste fluído ao processo de desaguamento, pode-se optar pelo seu condicionamento químico, que possibilita a liberação da água adsorvida. Uma maneira rápida e econômica de analisar preliminarmente o condicionante, concentração e dosagem a serem empregados seria pelo método do ensaio de cone. Neste trabalho, avaliou-se polímeros em busca do mais adequado ao desaguamento de resíduos gerados no Sistema Autônomo de Água e Esgoto (SAAE) da cidade de Elói Mendes, Minas Gerais. Determinadas as concentrações e dosagens dos condicionantes aniônicos e catiônicos a serem usados, com valores 0,1 e 0,2 % e, 10, 20 e 40 mL/L, respectivamente, procederam-se os ensaios de cone utilizando-se cone geotêxtil tecido. A análise foi feita a partir do volume filtrado e sua turbidez em cada teste. O condicionante químico aniônico, denominado A130, apresentou melhor desempenho, com concentração de 0,2 % e dosagem de 40mL/L. Entretanto visando a um melhor custo benefício em atividades de desaguamento, ao inferir-se para grandes volumes, o mais adequado para o lodo em estudo seria o uso do mesmo polímero à 0,1% e com dosagem de 20mL/L.

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Section: Condicionamento Químicounclassified

Section: Introductionunclassified

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Análise do Condicionamento Químico de Resíduos com Alto Teor de Líquido por Ensaio de Cone: Estudo de Caso com Lodo de ETA

Scalioni

Urashima

Guimarães

2020

BJD

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“…An alternative to conventional treatment of sludge is the use of geotextile closed systems (GCS) to dewater them. Their use has become popular in the past years, as they can provide a safe alternative to dispose of contaminated sediments by allowing dewatering, encasing and isolation of the waste inside the system (Guimarães et al, 2014;Lawson, 2008). The main goal of GCS in the sludge treatment chain is to achieve a volume reduction of the material through a filtration mechanism, allowing water to drain (Bourgès-Gastaud et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Influence of sand addition in the early stage retention of fine sludge dewatering by geotextile

Oliveira¹,

Vidal²

2020

Rev. ambiente água

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The need to investigate viable methods to facilitate correct disposal of high-water content waste is immediate in the scenario of water source degradation. In this context, Closed Geotextile Systems (CGS) have shown promise for dewatering a variety of high water-content sediments, aiming to reduce the waste final volume, encapsulating particles, and at the same time allowing fluid drainage. Especially in Water Treatment Plants, the geotextiles generally employed in these systems have good tensile strength and rigidity to support mechanical solicitations and hydraulic properties that warrant good drainage conditions. In these applications, the geotextile element should assure the waste confinement and retention of some particles that will form a filter cake which will control internal flow conditions. The present work investigated how small portions of sand influence fine-particle retention. The sludge used consisted of a mixture of filtered water with two well-defined fractions of ground quartz: FG, a silt and CG, a fine sand. The results show that small amounts of sand are capable of leading to the formation of a pre-filter, even if the maximum diameter of the fine particles is much less than the geotextile filtration opening size. The test results indicate that the retention efficiency gradually increases as CG increases in the solution, up to a fraction of CG close to 14%, which represents only 0.7% of the total solution mass. The increase in particle retention was directly proportional to the increase in the GC fraction until reaching the filtration efficiency of approximately 72% where it stabilizes.

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“…The consolidated tailings and geotextiles form composite soils with different strengths. In recent years, geotextile tubes have been widely used in dam construction [7], reinforced embankment [8], land reclamation [9], shoreline management [10] and sludge dewatering [11]. The use of geotextile tubes to construct dams can overcome the difficulties in dam construction due to fine tailings.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on Interfacial Shear Characteristics between Polypropylene Woven Fabrics

Zhang³

et al. 2019

Materials

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Geotextile tubes are used in dam construction because fine tailings are difficult to use. The shear characteristics of geotextile tubes during dam operation are closely related to those of the materials used to construct the tubes. Pull-out tests can accurately reflect the interfacial shear characteristics between geosynthetics in practice, so pull-out tests were carried out for different interfacial types of polypropylene woven fabrics under dry and wet states. The effects of the type of interface and dry-wet states on the interfacial shear characteristics were investigated, and the impact mechanisms were also discussed. The results indicated that P-type interfaces (the warp yarn on the interface is parallel to the pulling direction) tended to harden. However, PTP-type (the warp yarn on the interface is perpendicular to each other) and T-type (the weft yarn on the interface is parallel to the pulling direction) interfaces softened first and then tended to plateau after reaching peak shear stress, and softening became more obvious at higher normal stresses. The displacement corresponding to peak shear stress (referred to as “peak displacement” in this paper) of interfaces was positively correlated with the normal stress, and the wet state reduced the interfacial peak displacement. For different types of interfaces, the peak displacement of the T-type interface was the largest, followed by PTP-type and P-type. Interfacial shear characteristics conformed to Mohr–Coulomb strength theory and, compared with quasi-cohesion values ranging from 1.334 to 3.606 kPa, the quasi-friction angle significantly contributed to the interfacial shear strength. The quasi-friction angle of the interface was composed of a sliding friction angle and an occlusal friction angle. The shear strength of the interface was more sensitive to the interface types than whether they were in the dry or wet state. For different types of interfaces and dry-wet states, the change in the interfacial shear strength is respectively affected by the occlusal friction angle and the sliding friction angle on the interface.

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Dewatering of sludge from a water treatment plant in geotextile closed systems

Cited by 29 publications

References 15 publications

Análise do Condicionamento Químico de Resíduos com Alto Teor de Líquido por Ensaio de Cone: Estudo de Caso com Lodo de ETA

Análise do Condicionamento Químico de Resíduos com Alto Teor de Líquido por Ensaio de Cone: Estudo de Caso com Lodo de ETA

Influence of sand addition in the early stage retention of fine sludge dewatering by geotextile

Experimental Studies on Interfacial Shear Characteristics between Polypropylene Woven Fabrics

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