http://repositorio.ufc.br/handle/riufc/497 2026-06-18T20:55:23Z http://repositorio.ufc.br/handle/riufc/86776 Título: Uma abordagem multicritério para a construção de índices globais de desempenho como subsídio à regulação dos serviços hídricos de irrigação Autor(es): Amorim, Eliandro Lima de Abstract: Irrigation accounts for approximately 70% of global freshwater consumption and, in Brazil, for approximately 52% of total use, with Public Irrigation Projects (PPIs) managed by CODEVASF and DNOCS playing a strategic role in the regional development of the Northeast and the São Francisco Valley. Less than half of these projects achieve satisfactory technical efficiency, and the absence of synthetic evaluation instruments restricts benchmarking and performance-based regulation. This study proposes a methodology for constructing global performance indices for irrigation water services, supported by Multi-Criteria Decision Analysis (MCDA) methods. This quantitative, exploratory, and descriptive research analyzed 26 Public-Private Partnerships (PPIs), 20 managed by CODEVASF and 6 by DNOCS, distributed across seven Brazilian states, using data extracted from institutional reports from 2020. Seven indicators comprised the analytical basis: Water Profitability (RA), Water Operational Efficiency (EOA), Financial Insufficiency Index (ISF), Default Rate (IAD), Land Use Index (IUS), Area Profitability (RAR), and Job Creation (GE). Three multi-criteria methods were integrated: PROMETHEE II and TOPSIS with Monte Carlo simulation (1,000 iterations) and TOPSIS with entropy weighting. The projects revealed significant heterogeneity in both economic and operational dimensions, confirming the relevance of the adopted multi-criteria approach. The convergence between the methods proved to be consistent: Sen. Nilo Coelho, Maniçoba, Brumado, and Curaçá stood out as projects of excellence, while Cotinguiba/Pindoba, Boacica, and Estreito systematically occupied the most critical positions. The Pearson correlation r = 0.851 between TOPSIS-MC and TOPSIS-Entropy, combined with the stability of the rankings in the simulations, proved the robustness of the constructed indices. The results demonstrate that the proposed methodological integration converts the complexity of water management into objective and comparable metrics, providing concrete technical support to the regulatory action of ANA and to the advancement of the National Irrigation Policy. Tipo: Dissertação 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86576 Título: Efeito da adição de carvão ativado granular e biocarvão na formação, desempenho e estabilidade de lodo granular aeróbio Autor(es): Lopes, Sabrina Rodrigues Abstract: This study evaluated the effects of adding granular activated carbon (CAG) and biochar (BC) on the formation, morphology and performance of aerobic granular sludge (AGL) in reactors in sequential batches (RBS). Three reactors were operated (R1: control; R2: with 2 g L-1 of CAG; R3: with 2 g L -1 of BC) for 106 days, under progressive reduction of the processing time. sedimentation (from 20 to 5 minutes), followed by a maturation phase. Both additives accelerated biomass retention and granulation, but the BC performed top. The R3 reactor reached stable granules approximately 20 days earlier, with up to 40% of particles > 1.0 mm, SSV concentration greater than 5000 mg L-1 and high resistance mechanics. CAG showed limited adhesion due to its higher density, while BC particles adhered effectively, acting as nucleation sites and stimulating production of extracellular polymeric substances (SPE). Removal of organic matter remained consistently high across all reactors (>95%), while removal of ammonia reached values ​​above 98%. Total nitrogen removal stabilized between 60 and 65%, and phosphorus removal remained low (20-40%), without significant influence of additives. In general, BC increased the density and structural stability of the granules, confirming its potential as a sustainable additive to accelerate the formation of LGA Tipo: Dissertação 2025-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86193 Título: Substituição gradativa de sacarose pela fração líquida de resíduos de frutas e verduras em reator anaeróbio de leito fluidificado Autor(es): Dias, Ulisses Vitório Abstract: Proper management of fruit and vegetable waste (FVW) generated in Food Supply Centers (Ceasa) is an environmental and economic challenge. Dark fermentation (DF) emerges as a promising alternative for the valorization of these wastes, converting them into bio-hydrogen and organic acids (FAs). Among the reactors used, the anaerobic fluidized bed reactor (AFBR) stands out for its high biomass retention rate and capacity to support high organic loads. However, the literature lacks systematic studies on the adaptation and stability of AFBRs operating with complex substrates such as the liquid fraction of fruit and vegetable waste (LFVW). Given this, this dissertation evaluated the performance of a hydrocarbon-based reactor (RALF) in hydrogen production, subjected to a progressive increase in the concentration of volatile fatty acids (VFA) (0 to 100%) in the substrate, replacing sucrose, under mesophilic conditions (30 °C), with a hydraulic retention time (HRT) of 2 h, and a constant volumetric organic loading rate (LOR) of 60 kg COD m reactor -3 d -1 , without pH control. Under the 100% sucrose condition, the volumetric hydrogen production (HVP) and yield (YH) were 4361 mL H2 L reactor -1 d -1 and 2.6 mmol H2 g -1 COD applied, respectively. With complete replacement by VFA (100%), a sharp decline was observed, with HVP and YH reaching only 261 mL H2 L reactor -1 d -1 and 0.2 mmol H2 g -1 COD applied. This decrease was associated with a change in the metabolic profile of the microbial community, with an accumulation of propionic acid (APr) coupled with a consistently acidic pH (range of 4.0 and 4.3), which suppressed H2 producing bacteria and diverted carbon flow to acidogenic H2-consuming pathways such as propionogenesis and homoacetogenesis. However, integrated analysis with literature data demonstrated that the complex nature of FLRFV is not an absolute limiting factor. Operating the RALF with shorter HRTs (1 h) and higher VOCs (240 kg COD m reactor -3 d - 1 ) proved to be an effective strategy to reverse this scenario, establishing a butyric metabolic pathway and increasing PVH by up to 35 times. Therefore, the viability of FLRFV for bio-hydrogen production is intrinsically linked to an optimal operating window of HRT/VOC, which exerts selective pressure favorable to hydrogenogenic bacteria, overcoming the initial complexity of the residue. Tipo: Dissertação 2025-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86192 Título: Análise de suscetibilidade à liquefação dinâmica de areias com diferentes teores carbonáticos do litoral cearense mediante ensaios triaxiais cíclicos Autor(es): Cavalcante, Lucas Pereira Abstract: This study aims to investigate and evaluate the dynamic behavior and liquefaction susceptibility of soil samples with varying carbonate contents. This research is part of a larger project funded by Petrobras in partnership with the Federal University of Ceará. For this purpose, sandy samples were collected from different locations along the coastal zone of Ceará, exhibiting distinct carbonate contents in their compositions. These samples were obtained both from beach zones and from the offshore continental shelf. The selected sampling sites were Barra do Ceará Beach in Fortaleza, Moitas Beach in the county of Amontada, and Icapuí Beach in the county of same name. The samples were submitted characterization and calcimetric tests for classification purposes. Subsequently, a series of cyclic triaxial tests under strain-controlled conditions was performed. For the cyclic tests, the samples were sieved through a 2.38 mm mesh, in accordance with standard requirements and to ensure compatibility of results with the ongoing research. The samples were designated as follows: Barra do Ceará (BC 4), Moitas (MT 3), Icapuí (ICAP 5), and Offshore Platform (PCO 3). Based on their measured carbonate contents, they were classified respectively as lithoclastic (9.17%), lithobioclastic (40.70%), bioclastic (85.98%), and bioclastic (92.03%). The cyclic loading frequency adopted for all tests was 1.0 Hz, with strain amplitudes of 0.1%, 0.3%, 0.5%, and 0.7%. The confining pressure applied in all tests was 50 kPa, and all specimens were prepared at a relative density corresponding to a loose condition. The analyses considered the following parameters and plots: deviator stress, stress–strain behavior, pore pressure ratio, stress path, cyclic resistance, and stiffness degradation. The results indicated that samples with higher carbonate contents – particularly ICAP 5 – exhibited plots, behaviors, and cyclic resistance relatively superior to those of the predominantly quartzose sample (BC 4). In conclusion, it was observed that samples with higher carbonate contents tend to present greater cyclic resistance and lower stiffness degradation, likely associated with their carbonate composition. Furthermore, it was verified that bioclastic samples are capable of developing cyclic resistance exceeding 100% in certain cases, as evidenced by the mobilized deviator stress and the number of cycles required for liquefaction to occur. Tipo: Dissertação 2025-01-01T00:00:00Z