http://repositorio.ufc.br/handle/riufc/29278 Mon, 14 Sep 2026 02:04:17 GMT 2026-09-14T02:04:17Z http://repositorio.ufc.br/handle/riufc/87441 Título: Emissão de gases de efeito estufa em sedimentos expostos de um reservatório do semiárido brasileiro: quantificação de CO₂ e CH₄ por cromatografia gasosa Autor(es): Martins Neto, Aloisio Lopes Abstract: The greenhouse effect and climate change have been increasingly discussed and investigated over the past decades. Greenhouse gas emissions, particularly carbon dioxide (CO₂) and methane (CH₄), resulting from human activities are well recognized, mainly due to the burning of fossil fuels and the reduction in carbon sequestration caused by deforestation. Small water reservoirs are artificial lakes primarily used for domestic water supply and agricultural activities, and they may also contribute to greenhouse gas emissions. This study aimed to evaluate CO₂ and CH₄ fluxes from reservoir sediments during a dry period in a semiarid region, when the reservoir was completely dry. Gas samples were collected using static chambers at three sampling sites within the reservoir: the river inflow, the deepest area, and the spillway. The gas samples collected in the chambers were transferred to evacuated, airtight vials and transported to the laboratory for analysis. Gas concentrations were determined by gas chromatography, and the corresponding fluxes were calculated from these concentrations. The results showed substantial CO₂ emissions and relatively low CH₄ emissions, as expected due to the predominance of aerobic conditions in the exposed sediments. Although the magnitudes of CO₂ and CH₄ fluxes differed, the highest emissions of both gases were observed at the deepest area of the reservoir, whereas the spillway exhibited the lowest fluxes, suggesting that similar environmental factors influenced the dynamics of both gases. In conclusion, CO₂ emissions were higher than CH₄ emissions at all sampling sites, the fluxes exhibited spatial heterogeneity among sampling points, and both gases showed similar spatial patterns across the reservoir. Tipo: TCC Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/87441 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/87345 Título: Análise do tratamento de efluentes provenientes da fabricação de embalagens de alumínio Autor(es): Muniz, Stephanie Ferreira Moreira Abstract: Proper treatment of industrial wastewater is essential for reducing the environmental impacts caused by industrial activities, contributing to the preservation of water bodies in accordance with current environmental legislation. In this context, the present study aimed to perform physicochemical analyses of raw and pre-treated final wastewater samples generated during the aluminum can manufacturing process, with the purpose of evaluating the efficiency and operational stability of the Wastewater Treatment Plant WWTP. To achieve this objective, parameters such as pH, Chemical Oxygen Demand COD, total phosphorus, phosphate, nitrate, ammoniacal nitrogen, nitrite, aluminum residues, and sulfate were analyzed. The obtained results were compared with the standards established by COEMA Resolution No. 02/2017 and CONAMA Resolution No. 430/2017. Overall, the results demonstrated that the physicochemical treatment applied by the company was satisfactory, maintaining the evaluated parameters within the required limits and evidencing the removal of the main contaminants present in the wastewater. The variations observed throughout the monitoring period did not significantly affect the quality of the final effluent and were associated with operational characteristics of the production process. Therefore, it was concluded that the WWTP meets its intended objectives, while continuous system improvement remains an essential tool for maintaining treatment efficiency and promoting future opportunities for process optimization and wastewater reuse in non-potable applications. Tipo: TCC Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/87345 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/87298 Título: Adsorção de minerais do feijão (Phaseolus vulgaris) por microplásticos de polietileno: potenciais implicações para a biodisponibilidade nutricional Autor(es): Menezes, Matheus Silva de Abstract: The growing contamination of agricultural soils and processed foods by microplastics (MPs) has raised concerns regarding food safety, particularly concerning the bioavailability of essential nutrients. This study investigated the capacity of virgin and aged polyethylene (PE) microplastics (simulating environmental weathering) to adsorb Ca²⁺, Mg²⁺, Fe³⁺/²⁺, Zn²⁺, and K⁺ ions in cooked bean broth (Phaseolus vulgaris), evaluating the influence of pH and polymer aging on the adsorption process. The bean broth was prepared in the laboratory and subjected to adsorption experiments with PE microplastics under agitation at 36.5 °C. Nutrient concentrations were determined by inductively coupled plasma optical emission spectrometry (ICP-OES) after acid digestion of the samples. The results revealed that PE aging significantly increased adsorption at pH 2.50. At pH 7.0, virgin PE exhibited positive and reproducible adsorptions for multiple cations, contradicting expectations based on the polymer's surface inertness. The risk to food safety was evident, as the obtained adsorption values indicate that the presence of microplastics in bean broth may reduce the bioavailable fraction of essential nutrients, with removals ranging from 5% (zinc) to 68% (potassium). The data demonstrate that the phenomenon of nutrient adsorption by microplastics in complex food matrices is dependent on pH, polymer state, and matrix composition. Tipo: TCC Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/87298 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/87296 Título: Diagnóstico físico-químico da qualidade da água em lagoas de uso recreativo no município de Caucaia - CE Autor(es): Oliveira, Andressa dos Santos Abstract: This study aimed to evaluate the physicochemical water quality of the Barra Nova, Cauípe, and Banana lagoons, located in Caucaia, Ceará, to verify their suitability for primary contact recreation and balneability. These coastal lentic ecosystems play a fundamental socioeconomic, tourist, and ecological role in the region, yet they face increasing anthropogenic pressure. The CONAMA Resolution No. 357/2005 for Class 2 surface freshwaters was adopted as the normative framework. The methodology consisted of ten weekly sampling campaigns, totaling thirty samples collected between March 30 and June 1, 2026, a period that encompasses the transition of the local rainy season. Laboratory analyses included Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD), Ammoniacal Nitrogen, Nitrate, and Total Phosphorus. The results evidenced an alarming scenario regarding oxygenation and organic load in the system. A critical DO deficit was observed, with 76.6% of the samples falling below the minimum required limit of 5.0 mg/L, recording minimums of 1.8 mg/L and 2.1 mg/L in the Cauípe and Banana lagoons, respectively. Furthermore, BOD showed instability, with 33.3% of the results exceeding the regulatory ceiling of 5.0 mg/L. Such nonconformities may be associated with rainfall seasonality, wherein surface runoff washes the margins and carries organic matter, thereby accelerating heterotrophic metabolism and depleting free oxygen. Conversely, the lagoons demonstrated resilience to nutrient pollution. Ammoniacal Nitrogen and Nitrate achieved 100% legal compliance, as did Total Phosphorus, which remained below the quantification limit in all assays. The low phosphorus values are a positive indicator, as this element acts as a crucial limiting factor against cultural eutrophication and cyanobacterial proliferation. This study reinforces that, although the system resists eutrophication, the lagoons suffer pressures that drastically affect their self-purification capacity, demanding systematic monitoring and integrated environmental management to ensure ecosystem preservation and the sanitary safety of bathers. Tipo: TCC Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/87296 2026-01-01T00:00:00Z