01.1 - Graduação (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2
Navegar
3 resultados
Resultados da Pesquisa
Item Produção de bioestruvita como estratégia de recuperação de fósforo a partir de águas residuárias(2023-09-13) Silva, Vanessa Andrade da; Barboza, Marianne de Lima; Fernandes, Bruna Soares; http://lattes.cnpq.br/5781583265737346; http://lattes.cnpq.br/8665242735385886; http://lattes.cnpq.br/0284174185527451The precipitation of struvite (MgNH4PO4•6H2O) is an environmental technology aimed at addressing the issues of eutrophication in water bodies. Furthermore, it enables the recovery of phosphorus and nitrogen to be used as fertilizer, potentially contributing to the demands of the agricultural sector. Its biological production is considered promising, as it proves to be more sustainable than physicochemical production. In this manner, the production of biostruvite by B. pumilus was assessed in synthetic media derived from two effluents: residual water from potato processing, post-anaerobic treatment, and hydrolyzed human urine. The assays were monitored over 0, 3, 5, 7, and 10 days, maintained at 30°C under agitation at 100 rpm. The crystals were characterized through scanning electron microscopy analysis, accompanied by energy-dispersive X ray spectroscopy and X ray diffraction. Incubation of synthetic urine yielded the highest microbial performance, resulting in the removal of 98% of acetate and 86% of phosphate, likely favored by the higher substrate concentration compared to the synthetic potato effluent. Crystals from both media exhibited quality characteristics compatible with their application as inorganic fertilizers. It was concluded that, based on the absence of precipitates in abiotic tests and pH values below 8.4 in the reactors, the struvite crystals are of biological nature.Item Fotogranulação e recuperação de fósforo em fotobiorreator em bateladas sequenciais no tratamento de esgoto doméstico de baixa carga orgânica(2023-08-08) Almeida, Ana Alice Xavier de; Magnus, Bruna Scandolara; http://lattes.cnpq.br/7126445594531053; http://lattes.cnpq.br/8471636011949542The application of the algal-bacterial consortium in the treatment of wastewater has been studied for several aspects beyond the reduction of pollutant load. Among these aspects, the high nutrient removal capacity and the potential for utilization of excess biomass stand out. Therefore, this study investigated the performance of the algal-bacterial granular consortium in a photobioreactor in sequential batches, operating with 4 h cycles, treating synthetic domestic wastewater under light intensity, as well as evaluating the phosphorus recovery capacity in the biomass. To achieve the objective of this research, a transparent acrylic photobioreactor was constructed with a useful volume of 3.5 L, with a height/diameter ratio of 8 mm and a volumetric change of 55%. The system was inoculated with the mixture of aerobic sludge from a sludge station activated by prolonged aeration. Aerobic granules were obtained in the photobioreactor, and granules with diameters between 0.2 and 1 mm were formed. Throughout the experiment, the COD removal efficiency averaged 88% and remained stable throughout the experiment. The system achieved 72% nitrogen removal efficiency, so the microalgae growth may have contributed to this removal. Chlorophyll concentration reached 5.8 mg/L in the photobioreactor, indicating a symbiosis between heterotrophic bacteria and microalgae. Concentrations were noticeable in five fractions of phosphorus present in the biomass, found concentrations of 4.9 mg/g.SSV, 4.1 mg/g.SSV, 5.4 mg/g.SSV, 1.4 mg/g.SSV, 0.38 mg/g.SSV for total, organic, inorganic, apatite and non-apatite phosphorus, respectively, showing the potential for application in agriculture.Item Estudo do efeito de matriz na determinação de fósforo em espécies arbóreas de floresta tropical seca por espectrofotometria com azul de molibdênio(2019-07-25) Assunção, Edilane Alice de Alcântara; Freire, Fernando José; http://lattes.cnpq.br/8371992516325399; http://lattes.cnpq.br/3298059299648343Dry tropical forest soils have a shortage of phosphorus. Tris nutrient after absorption by plants, is returned to the soil by the nutrient cycling process, an ecosystem process essential for the conservation of forest ecosystems. Thus, the analysis of leaf material and the nutritional status of leaves are important because they allow understanding the dynamics and maintenance of forest ecosystems. The visible spectrophotometric method with molybdenum blue stands out in the determination of phosphorus, mainly due to its level of sensitivity. However, the matrix effect during analysis may compromise the reliability of the results obtained. Given the above, this research aimed to evaluate the effect of matrix on the determination of phosphorus in tree species of dry tropical forest by spectrophotometry with Molybdenum Blue. The study included the two most representative species in the forest environment in Araripina, Pernambuco, in the dry and wet periods. Digestion of the plant material was performed with 98% sulfuric acid and 30% hydrogen peroxide in the presence of catalysts. The determination was made by molybdenum blue spectrophotometry, associated with standard addition and five matrix dilution ratios. The data showed a decrease in absorbance resulting from the matrix effect and consequently the quantified P content. The pH of the plant extract also affected the analytical determination of phosphorus, however, less significantly than the matrix effect. Samples submitted to matrix dilution and standard addition showed a more efficient phosphorus recovery. The species Croton Limae and Guapira Opposita presented higher phosphorus contents in the wet period, due to the influence of rainfall. Guapira Opposita was the species with the highest P content in both evaluation periods, and the one with the lowest influence of the matrix effect. Thus, the matrix effect influences the phosphorus quantification by the molybdenum blue method, especially in low P species. This effect can be minimized by using matrix dilution combined with standard addition.