http://repositorio.ufc.br/handle/riufc/490 Sun, 26 Jul 2026 09:30:00 GMT 2026-07-26T09:30:00Z http://repositorio.ufc.br/handle/riufc/87243 Título: Impacto dos mediadores redox na remoção de cor de corantes azo e antraquinônico por lodo granular anaeróbio sob condições mesofílicas e termofílicas Autor(es): Santos, André Bezerra dos; Cervantes, Francisco Javier; Van Lier, Jules Bernardus Abstract: The effect of different redox mediators (RM) on colour removal of azo and anthraquinone dyes was investigated with anaerobic granular sludge under mesophilic (30ºC) and thermophilic (55ºC) conditions. Batch experiments revealed that an addition of catalytic concentrations of RM provided a remarkable effect on the decolourisation rates of the azo dye Reactive Red 2 (RR2), but the same effect could not be obtained with the anthraquinone dye Reactive Blue 5 (RB5). Nevertheless, for both dyes, the temperature increase to thermophilic conditions was an effective strategy to considerably accelerate the decolourisation process compared to mesophilic conditions. For instance, the first-order rate constant “k” of RR2 and RB5 reduction, was increased in 6.2 and 11-fold, respectively, at 55ºC in comparison with 30ºC. Such an effect of the temperature on the reductive decolourisation of azo dye was also verified in continuous flow experiments Tipo: Artigo de Periódico Mon, 01 Jan 2007 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/87243 2007-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/87190 Título: Use of the stiffness method to evaluate the improvement of the bearing capacity of soil reinforced by microgrids Autor(es): Sernache, Neyla Lima Carneiro; Soares, Anderson Borghetti; Aguiar, Marcos Fábio Porto de Abstract: The search for soil strength and stiffness improvement is essential in geotechnical engineering. Geosynthetic reinforcement has been considered an effective solution, as it increases the stability of geotechnical works and reduces settlement. These materials are used in works that require greater stiffness, as well as shear and tensile strength, such as foundations and retaining walls. Among geosynthetics, microgrids are used to promote the separation and reinforcement of soils. However, because it is a recently developed geosynthetic on the market, little is known about its properties in soil reinforcement structures, especially when compared with other geosynthetics with the same function, highlighting the need for more research. This research aimed to evaluate the improvement in the bearing capacity of soils reinforced with microgrids. As the results of the pressure x settlement curves did not characterise a typical physical failure behaviour, the failure was conventionally defined based on the Décourt stiffness method. Through the analysis of pressure x settlement curves, the behaviour of natural soils was compared with (i) compacted samples and (ii) compacted samples reinforced with three layers of microgrids. This demonstrated the increase in soil bearing capacity and stiffness through these improvement techniques, which was even more significant when microgrids were inserted in the compacted soil sample. The inclusion of microgrids as a reinforcing element is an effective alternative for stabilising foundations. The stiffness curves showed a tendency to stabilise without reaching zero stiffness, which, according to the Décourt method, confirms the absence of physical failure. Tipo: Artigo de Periódico Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/87190 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/87100 Título: Aerobic granulation process applied to landfill leachate treatment Autor(es): Silva, Vicente Elício Porfiro Sales Gonçalves da; Rollemberg, Silvio Luiz de Sousa; Santos, André Bezerra dos Abstract: The performance of aerobic granular sludge (AGS) process was evaluated for real leachate treatment, assessing the system capacity to form granules, biomass characteristics, and other engineering and microbiological aspects. Two sequencing batch reactors were operated with a leachate concentration of 25% (R1) and 50% (R2), with an 8-h cycle. The time required for granulation was greater than 80 days in both reactors, and solids loss was significant. The sedimentation rate was also outside the typical values for AGS reactors, with a sludge volumetric index in 30 min (SVI30) greater than 70 mL/g. Although the granules produced in R2 were more compact (200 μm), they were more resistant. Proteobacteria and Rhodobacteraceae were the phyla and the most abundant family in R2. The phylum Planctomycetota and the family Pirellulaceae were the most abundant in R1. Settling time reduction, feeding phase increase, and increased dissolved oxygen (DO) levels were fundamental strategies to improve reactors’ performance and stability. Tipo: Artigo de Periódico Sun, 01 Jan 2023 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/87100 2023-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/87096 Título: Avaliação legal e prática da aplicação de águas residuárias tratadas no solo no contexto do reúso de água no Brasil Autor(es): Carvalho, Clara Bandeira de; Mota, Francisco Suetônio Bastos; Santos, Ana Sílvia Pereira; Santos, André Bezerra Dos Abstract: Water reuse is considered an important water management tool. However, in Brazil, only 4.9% of the water used is reused, most of it in activities with the risk of releasing treated wastewater (TWW) into the soil. In this article, an analysis was made of 6 Brazilian legislations that regulate the TWW use and that present values for reuse standards and their requirements for monitoring impacts on the soil. Studies on the dispersion of pollutants in the soil were also analyzed. It was concluded that besides the advance in reuse standards, an expansion is necessary to promote the dissemination of the practice in the country. The reference values adopted by the legislations are discrepant, and some are highly restrictive and inconsistent with the Brazilian socio-economic reality. Few legislations indicate a concern with soil quality when TWW is available, and none specify a method for evaluating the dispersion of pollutants in the soil. Tipo: Artigo de Periódico Sun, 01 Jan 2023 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/87096 2023-01-01T00:00:00Z