503 documents found, page 1 of 51
Microbial activity of the inoculum determines the impact of activated carbon, m...
Braga, Cátia Sofia Neves; Martins, Gilberto; Duarte, Maria Salomé Lira; Soares, O. Salomé G. P.; Pereira, M. Fernando R.; Pereira, Inês A. C.Available online 7 January 2025; The conversion of organic matter to methane through anaerobic digestion (AD) process can be enhanced by different materials. However, literature reports show inconsistent results on the effect of materials in different AD systems. In this study, we evaluated the influence of the inoculum's activity on methane production (MP) efficiency in the presence of different materials (act...
Micro-aeration as a pre-treatment to decrease LCFA toxicity in anaerobic biorea...
Duarte, Maria Salomé Lira; Costa, Luís; Magalhães, Carla Isabel Pereira; Pereira, M. A.; Stams, Alfons. J. M; Alves, M. M.; Cavaleiro, Ana Júlia VianaIntroduction: Micro-aeration in anaerobic digestion (AD) has shown process improvement, namely in the degradation of long-chain fatty acid (LCFA). Under micro-aeration, oleate, a toxic LCFA, can be faster converted to methane [1,2]. This is related to the presence of facultative anaerobic bacteria (FAB) which seem to be linked to oleate-to-palmitate conversion, although their role in this transformation is not ...
Monitoring the stability of aerobic granular sludge under increasing fractions ...
Silva, Sérgio Alves; Duarte, Maria Salomé Lira; Amaral, A. Luís; Ferreira, Eugénio C.; Alves, M. M.; Mesquita, D. P.This work investigates the effects of increasing fraction of slowly biodegradable chemical oxygen demand (sbCOD) on the morphology, stability, and performance of aerobic granular sludge (AGS) used for wastewater treatment. A sequencing batch reactor (SBR) was supplied with synthetic wastewater containing acetate as readily biodegradable COD (rbCOD) and increasing concentrations of oleate as slowly biodegradable...
Individual-based modelling elucidates about the role of nanomaterials on methan...
Sequeira, João C.; Li, Bowen; Alves, M. M.; Rocha, Miguel; Curtis, Tom P.; Salvador, Andreia Filipa FerreiraModelling stands as a potent tool for the simulation of real-world systems, offering predictive insights into their dynamic behaviours. Individual-Based Models (IBMs), with their ability to capture intricate details at the microscale, emerge as particularly valuable tools. In the context of anaerobic digestion (AD), the application of IBMs gains significance. Some nanomaterials (NM) enhance methane production i...
Deciphering the impact of activated carbon, magnetite and zeolite on the activi...
Braga, Cátia Sofia Neves; Martins, Gilberto; Duarte, Maria Salomé Lira; Costa, João Carlos Sequeira; Soares, O. S. G. P.; Pereira, M. F. R.Biomethane has a paramount role in the emergent energy transition occurring in Europe, and biotechnological strategies to accelerate biomethane production are needed. In this work, we investigated the effect of several materials (activated carbon (AC), magnetite and zeolite) on the activity of methanogenic cultures, including pure cultures and complex microbial communities. Anaerobic incubations were set up wit...
MOSCA 2.0: a bioinformatics framework for metagenomics, metatranscriptomics and...
Costa, João Carlos Sequeira; Pereira, Vítor; Alves, M. M.; Pereira, M. A.; Rocha, Miguel; Salvador, Andreia Filipa FerreiraThe analysis of meta-omics data requires the utilization of several bioinformatics tools and proficiency in informatics. The integration of multiple meta-omics data is even more challenging, and the outputs of existing bioinformatics solutions are not always easy to interpret. Here, we present a meta-omics bioinformatics pipeline, Meta-Omics Software for Community Analysis (MOSCA), which aims to overcome these ...
Non-conductive silicon-containing materials improve methane production by pure ...
Braga, Cátia Sofia Macedo; Martins, Gilberto; Soares, O. Salomé G. P.; Pereira, M. Fernando R.; Pereira, Inês A. C.; Pereira, Luciana; Alves, M. M.Supplementary data to this article can be found online at https://doi.org/10.1016/j.biortech.2024.131144.; Conductive materials (CM) enhance methanogenesis, but there is no clear correlation between conductivity and faster methane production (MP) rates. We investigated if MP by pure cultures of methanogens (Methanobacterium formicicum, Methanospirillum hungatei, Methanothrix harundinacea and Methanosarcina bark...
MiDAS 5: Global diversity of bacteria and archaea in anaerobic digesters
Dueholm, Morten Kam Dahl; Andersen, Kasper Skytte; Petersen, Anne-Kirstine C.; Rudkjøbing, Vibeke; Alves, M. M.; Bajón-Fernández, YadirabioRxiv - the Preprint Server for Biology; Anaerobic digestion represents a key biotechnology for the transformation of organic waste into renewable energy (biogas) and relies on complex microbial communities that work in concert to degrade the complex substrates into methane and carbon dioxide. Here, we sequenced more than half a million high-quality, full-length 16S rRNA gene sequences from 285 full-scale ana...
MiDAS 5: Global diversity of bacteria and archaea in anaerobic digesters
Dueholm, Morten Kam Dahl; Andersen, Kasper Skytte; Korntved, Anne-Kirstine C.; Rudkjøbing, Vibeke; Alves, M. M.; Bajón-Fernández, YadiraAnaerobic digestion of organic waste into methane and carbon dioxide (biogas) is carried out by complex microbial communities. Here, we use full-length 16S rRNA gene sequencing of 285 full-scale anaerobic digesters (ADs) to expand our knowledge about diversity and function of the bacteria and archaea in ADs worldwide. The sequences are processed into full-length 16S rRNA amplicon sequence variants (FL-ASVs) and...
Micro-aeration to improve oleate degradation in bioreactors
Magalhães, Carla Isabel Pereira; Duarte, Maria Salomé Lira; Pereira, M. A.; Stams, Alfons Johannes Maria; Cavaleiro, Ana Júlia Viana; Alves, M. M.Oleate (OL) is a long-chain fatty acid (LCFA) abundant in lipid-rich wastewater, and it is toxic to anaerobic microbial communities. Previous works showed that OL was faster converted to methane when in the presence of small oxygen concentrations, entering in bioreactors without control. In this study, controlled micro-aeration was applied, triggered by redox potential (ORP), to drive OL biodegradation to metha...