29 documents found, page 1 of 3
A pilot-scale evaluation of residual sludge quality in a worm-sludge treatment ...
Gholipour, Amir; Fragoso, Rita; Galvão, Ana; Duarte, ElizabethA pilot-scale study on sludge treatment reed beds investigated the combined effects of earthworms and Arundo donax on sewage sludge dewatering and residual sludge quality. Four units were tested: one planted with earthworms, one planted without earthworms, one unplanted with earthworms, and one control, each unit replicated. Over a year, 24 cycles of sludge (dry and volatile solid contents of 24.71 g.L 1, and 1...
Evaluating drained water quality in a pilot worm-sludge treatment reed bed plan...
Gholipour, Amir; Fragoso, Rita; Galvão, Ana; Duarte, ElizabethThis study evaluated the impact of incorporating earthworms (Eisenia fetida) on the drained water quality from a sludge treatment reed bed. The experiment encompassed four setups of treatment beds in two replicates: planted with Arundo donax and addition of earthworms, planted without earthworms, unplanted with earthworms, and treatment bed without plants nor earthworms as control. The units were fed every two ...
Mango peel nanofiltration concentrates to enhance anaerobic digestion of slurry...
Fragoso, Rita; Silva, Inês; Gomes, Tânia; Martins, Cátia; Bengala Freire, João; Duarte, Elizabeth; Macedo, AntóniaThe environmental impact of biowaste generated during animal production can be mitigated by applying a circular economy model: recycling, reinventing the life cycle of biowaste, and developing it for a new use. The aim of this study was to evaluate the effect of adding sugar concentrate solutions obtained from the nanofiltration of fruit biowaste (mango peel) to slurry from piglets fed with diets incorporating ...
The Role of Mild Alkaline Pretreatment in the Biorefinery Upgrade of Spent Coff...
Ribeiro, Gabriel Mota; Martins, Pedro L.; Oliveira, Ana Cristina; Carvalheiro, Florbela; Fragoso, Rita; Duarte, Luís C.ABSTRACT: This work proposes a valorization route for spent coffee grounds (SCG), a widespread lignocellulosic residue, encompassing the production of: biomethane, lignin, and oligosaccharides as value-added products obtained simultaneously during a mild alkaline (NaOH) pretreatment. The studied operational variables were the reaction time (60-240 min), temperature (25-75 degrees C), and the NaOH concentration ...
The role of mild alkaline pretreatment in the biorefinery upgrade of spent Coff...
Ribeiro, Gabriel Mota; Martins, Pedro L.; Oliveira, Ana Cristina; Carvalheiro, Florbela; Fragoso, Rita; Duarte, Luís C.This work proposes a valorization route for spent coffee grounds (SCG), a widespread lignocellulosic residue, encompassing the production of: biomethane, lignin, and oligosaccharides as value-added products obtained simultaneously during a mild alkaline (NaOH) pretreatment. The studied operational variables were the reaction time (60–240 min), temperature (25–75 C), and the NaOH concentration (0–2.5 M). The sev...
Impact of sandy soil amendment with dairy slurry treated through pH adjustment ...
Rodrigues, Joana; Fragoso, Rita; Brito, Luisa; Fangueiro, DavidLivestock farming produces high volumes of animal slurry that can be sanitized using low-cost treatments by pH adjustment, reducing pathogen contamination, and promoting slurry valorization as a safe fertilizer. This work aims to evaluate the impact of sandy soil amendment with dairy slurry treated by pH adjustment on the potential release of nutrients and coliforms into groundwater. A laboratory soil column le...
Enhanced Biomethanation: the impact of incorporating fish waste on the co-diges...
Silva, Joana; Fragoso, RitaAnaerobic digestion technology can play a significant role in the transition to a low-carbon and circular economy by producing bioenergy (biomethane) and organic fertilizer (digestate). This study proposes a valorization approach for three waste streams widely produced in the Mediterranean area: fish waste (FW), pig slurry (PS), and orange pomace (OP). The FW lipid content can enhance biomethane yield as long a...
Arytenoid bilateral subluxation following laryngeal mask airway – first case re...
Caneira, Tiago; Subtil, João; Fragoso, Rita; Araújo, João; Santos, Alberto; Macor, CarlosBackground: Laryngeal mask is a very practical every-day device for airway management, with rare complications reported. We did not find reports of bilateral cases, making the present case a singular one. Methods: A 28-year-old male, with no airway problems expected, submitted to orthopedic surgery with combined brachial plexus block with balanced general anesthesia with easy insertion of the laryngeal mask. Re...
Sludge Treatment Reed Bed under different climates: A review using meta-analysis
Gholipour, Amir; Fragoso, Rita; Duarte, Elizabeth; Galvão, AnaSludge Treatment Reed Beds (STRBs) have been used worldwide over the past few decades. This review aims to overarchingly identify and appraise the currently available knowledge of STRB technology and discern climatic patterns through Meta-Analysis (MA). We systematically searched Google Scholar, Scopus, and Web of Science databases (up to Dec 2021) via a combination of keywords to identify English-language stud...
Bittern-impregnated sisal: An alternative magnesium source for phosphorus recov...
Rodrigues, Denis Manuel; Carvalho, Ana P.; Fragoso, Rita; Hein, Thomas; Brito, Antonio Guerreiro DeLooking for cheaper and more transportable alternative magnesium(Mg2+) sources to envisage the full-scale application of downstream transfer of P recovery through struvite precipitation, sisal fibres were impregnated with bittern:water (B:W) ratio solutions 1:4; 1:5; 1:7 and 1:10. Two methods were attempted: the one-step method with a simultaneous Mg2+ release and struvite precipitation, and the two-step method...