https://rd.uffs.edu.br/handle/prefix/5756 2025-12-06T10:46:17Z https://rd.uffs.edu.br/handle/prefix/8581 Title: Relatório final de pós-doutorado Author: Silva, Marlon Luiz Neves da Publisher: Universidade de Aveiro Type: Relatório de Pesquisa 2025-01-01T00:00:00Z https://rd.uffs.edu.br/handle/prefix/8090 Title: Relatório final de pós-doutorado Author: Staudt, Ederson Publisher: Universidade Federal do Rio Grande do Sul Type: Relatório de Pesquisa 2024-01-01T00:00:00Z https://rd.uffs.edu.br/handle/prefix/5772 Title: Influência do modo de alimentação sobre o desempenho de wetland construído vertical de fundo saturado no tratamento de esgoto sanitário Author: Bassani, Leandro First advisor: Sezerino, Pablo Heleno Abstract: The vertical flow constructed wetlands (VFCW) are considered consolidated systems worldwide in wastewater treatment, presenting stability in the quality of the treated effluent and low constructive and operational requirements in relation to compact systems with induced energy, making them an attractive ecotechnology to decentralized systems. Design and operation criteria have been established under different contour conditions. However, understanding of the influence of the feeding mode (FM) of influent on the efficiency of wetlands is not fully established in the technical literature, being scarce and discrepant the available information regarding the optimized operation of the VFCW and of the partially saturated vertical flow constructed wetlands (PVFCW) modality. This difficulty in fixing the optimal FM is linked to the complexity of the mathematical description of the pollutant transformation kinetics when transmitted to transient flow in a porous medium, as occurs in both wetlands. In this way, this study aimed to optimize the performance of sanitary wastewater treatment promoted by PVFCW, through the variation of the specific volume (SV) applied in an influent pulse and the specific hydraulic rate (SHR), as well as, to compare the treatment performance promoted by VFCW and PVFCW, when both were submitted to the same operational condition. The results obtained for the PVFCW regarding the decrease in SV from 25.35 L m -2 to 12.29 L m -2 did not show a statistically significant impact on the efficiency of removal of influent loads of COD, BOD 5 , NT and N-NH 4 + . For the COD load removal efficiency parameter, the median efficiencies were 95.5% and 94.2% for the SV of 25.35 L m -2 and 12.29 L m -2 , respectively. For the TN parameter, the respective median load removal efficiencies were 49.11% and 56.2% for the highest and lowest SV, respectively. For the NH 4 +- - N parameter, the mean load removal efficiencies were 79.5% and 76.9%, respectively. Finally, for the PO 4 3- -P parameter load removal efficiency, statistically significant differences were observed, with median efficiencies of 82.2% and 91.3% for the highest and lowest SV respectively. Moreover, no significant differences were detected for the means of maximum oxygen consumption rate (OCR max), when the SV value was varied (46.03 g O 2 m -2 d -1 for SV of 25.35 L m -² and 44.36 g O 2 m -2 d -1 for SV of 12.29 L m -² ). The SV variation also did not result in statistically significant differences in the ratio between the power consumed by the pumping system and the mass of oxygen introduced. In median terms, the values obtained for this criterion were 0.148 KW Kg O 2 -1 and 0.145 KW Kg O 2 -1 for the highest and lowest SV, respectively. Regarding the SHR from 4 to 9.6 L m -2 min -1 , concomitantly with a reduction of hydraulic loading (HL) from 101.4 to 74.9 mm d -1 , there was also no improvement in the charge removal efficiency of the evaluated physicochemical parameters. However, energy efficiency was lower for operation with an SHR of 9.6 L m -2 min -1 compared to 4 L m -2 min -1 (7.84 kg O 2 kW h -1 for the largest SHR to 19.29 kg O 2 kW h -1 for the smallest SHR). Considering that the BOD 5 and NH 4 + -N effluent concentrations were below the legal limit of discharge of treated wastewater for the two SHR values, it is concluded that an SHR of 4 L m -2 min -1 is sufficient to comply with environmental legislation concomitantly with lower energy consumption. In relation to the comparison between VFCW and PVFCW, the results show the superiority of the PVFCW in the load removal efficiency for all quality parameters evaluated. Considering the results obtained, it is concluded that the best configuration for VFCW for advanced secondary treatment of sanitary wastewater is the PVFCW typology, operated with HL varying between 75 and 100 mm d -1 , the minimum SHR of 4 L m -2 min -1 , SH between 12 and 25 L m -2 and minimum interval time between pulses of 3 hours. Publisher: Universidade Federal de Santa Catarina Type: Tese 2020-07-21T00:00:00Z