http://repositorio.ufc.br/handle/riufc/490 Sat, 04 Apr 2026 15:39:31 GMT 2026-04-04T15:39:31Z http://repositorio.ufc.br/handle/riufc/80558 Título: Aerobic granulation and resource production under continuous and intermittent saline stress Autor(es): Santos, André Bezerra dos; Almeida, Francisca Denise Pereira; Carvalho, Clara Bandeira de; Barros, Antonio Ricardo Mendes; Frutuoso, Francisca Kamila Amancio Abstract: Three sequential batch reactors (SBR) were operated to evaluate salt addition's impact on granulation, performance, and biopolymer production in aerobic granular sludge (AGS) systems. System R1 was fed without adding salt (control); system R2 operated with saline pulses, i.e., one cycle with salt (2.5 g NaCl/L) addition followed by another without salt; and R3 received continuous supplementation of 2.5 g NaCl/L. The results indicated that the reactors supplemented with salt presented higher concentrations of mixed liquor volatile suspended solids (MLVSS) and better settleability than R1, showing that osmotic pressure contributed to biomass growth, accelerated granulation, and improved physical characteristics. The faster granulation occurred in R2, thus proving the beneficial effects of intermittent salt addition through alternating pulses. Salt addition did not impair the simultaneous removal of carbon, nitrogen, and phosphorus. In fact, R2 showed better carbon removals. In conclusion, continuous or intermittent (pulsed) supplementation of 2.5 g NaCl/L did not lead to increased production of extracellular polymeric substances (EPS) and alginate-like exopolymers (ALE). This outcome could be attributed to the low saline concentration employed, a higher food-to-microorganism (F/M) ratio observed in R1, and possibly greater endogenous consumption of biopolymers in the famine period in R2 and R3 due to the greater solids retention time (SRT). Therefore, this study brings important results that contribute to a better understanding of the effect of salt in continuous dosing or in pulses as a selection pressure strategy to accelerate granulation, as well as the behavior of the AGS systems for saline effluents. Tipo: Artigo de Periódico Mon, 01 Jan 2024 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/80558 2024-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/80534 Título: Short‐term predictors of stereotactic radiosurgery outcome for untreated single non‐small cell lung cancer brain metastases: a restrospective cohort study Autor(es): Souza Filho, Francisco de Assis de; Becco Neto, Eliseu; Bastos, Dhiego Chaves de Almeida; Yoshikawa, Marcia Harumy; Figueiredo, Eberval Gadelha; Prabhu, Sujit Abstract: Stereotactic radiosurgery (SRS) is an option for brain metastases (BM) not eligible for surgical resection, however, predictors of SRS outcomes are poorly known. The aim of this study is to investigate predictors of SRS outcome in patients with BM secondary to non-small cell lung cancer (NSCLC). The secondary objective is to analyze the value of volumetric criteria in identifying BM progression. This retrospective cohort study included patients >18 years of age with a single untreated BM secondary to NSCLC. Demographic, clinical, and radiological data were assessed. The primary outcome was treatment failure, defined as a BM volumetric increase 12 months after SRS. The unidimensional measurement of the BM at follow-up was also assessed. One hundred thirty-five patients were included, with a median BM volume at baseline of 1.1 c ­ m 3 (IQR 0.4–2.3). Fifty-two (38.5%) patients had SRS failure at follow-up. Only right BM laterality was associated with SRS failure (p=0.039). Using the volumetric definition of SRS failure, the unidi-mensional criteria demonstrated a sensibility of 60.78% (46.11%–74.16%), specificity of 89.02% (80.18%–94.86%), positive LR of 5.54 (2.88–10.66) and negative LR of 0.44 (0.31–0.63). SRS demonstrated a 61.5% local control rate 12 months after treatment. Among the potential predictors of treatment outcome analyzed, only the right BM lateral-ity had a significant association with SRS failure. The volumetric criteria were able to identify more subtle signs of BM increase than the unidimensional criteria, which may allow earlier diagnosis of disease progression and use of appropriate therapies. Tipo: Artigo de Periódico Mon, 01 Jan 2024 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/80534 2024-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/80533 Título: Effect of thermo-alkaline pretreatment and substrate inoculum ratio on methane production from dry and semi-dry anaerobic digestion of swine manure Autor(es): Santos, André Bezerra dos; Silva, Amanda de Sousa; Santos, Amanda Lima Moraes dos; Malveira, Isabele Clara Cavalcante Abstract: Obtaining biogas from biomass, such as swine manure (SM), through anaerobic digestion (AD) is an alternative renewable energy source. In this context, this work aimed to analyze the influence of thermo-alkaline pretreatment (3 % NaOH at 121 ◦C for 30 min) and the substrate/inoculum ratio (SI) on AD at 10 and 15 % total solids – TS. Moreover, mathematical modeling and molecular biology tools were used to understand better the process and obtain kinetic parameters that assist in the optimization and scaling. The experiments were conducted in batch mode at 37 ◦C with orbital shaking at 150 rpm for 90 days. SM pretreatment increased cumulative methane yield from 30 to 205 mL/gVS. Furthermore, increasing the SI ratio from 1 to 3 gVSsubstrate/gVSinoculum enhanced this yield from 205 to 268 mL/gVS, although the lag phase increased from 0 to 3.5 days. When increasing the TS content to 15 %, the accumulated methane yield decreased to 136 mL/gVS, and the lag phase increased from 0 to 13 days. Regarding the microbiological evaluation, the genera Actinobacteriota and Chloroflexi were linked to higher methane production, and the dominant genus of archaea was Methanobacterium in almost all conditions tested. Tipo: Artigo de Periódico Mon, 01 Jan 2024 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/80533 2024-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/80201 Título: Design of a Dry Cover Pilot Test for Acid Mine Drainage Abatement in Southern Brazil, Part II: Pilot Unit Construction and Initial Monitoring Autor(es): Soares, Anderson Borghetti; Possa, Mario Valente; Souza, Vicente Paulo de; Soares, Paulo Sérgio Moreira; Barbosa, Maria Claúdia; Ubaldo, Mariluce de Oliveira; Bertolino, Ana Valéria Freire Allemão; Borma, Laura Simone Abstract: Pyritic coal wastes produced by a coal beneficiation plant in the state of Santa Catarina in Southern Brazil are acid generating. Here we report the second part of a study evaluating the use of a dry cover to minimize acid mine drainage generation and its release into the environment. This part encompasses the construction and initial monitoring of an experimental pilot-scale unit. Local clays and ash from a power station were used as cover materials. Monitoring started in October 2007 and will extend for at least 4 years. Initial results of the dry cover system constructed using compacted locally available clay and ash look promising. The pH of the drainage ranged from 6.0 to 7.0, within the legal limits for discharge into the environment. Tipo: Artigo de Periódico Fri, 01 Jan 2010 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/80201 2010-01-01T00:00:00Z