Marilós Balaguer

Marilós Balaguer
Universitat de Girona | UDG · LEQUIA Laboratory of Chemical and Environmental Engineering

PhD

About

193
Publications
23,028
Reads
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4,423
Citations
Additional affiliations
September 1991 - present
Universitat de Girona
Position
  • Senior Researcher
Description
  • New tecnologies for biological nitrogen removal

Publications

Publications (193)
Article
Anaerobic gas fermentation is a promising approach to transform carbon dioxide (CO2) into chemical building blocks. However, the main operational conditions to enhance the process and its selectivity are still unknown. The main objective of this study was to trigger chain elongation from a joint perspective of thermodynamic and experimental assessm...
Article
Full-text available
The present work assessed the alliance of microbial electrochemical technologies (METs) and fermentation in a two-step process for the electro-bioconversion of carbon dioxide (CO2) into elongated chemical building blocks. The electro bio-reduction of CO2 into acetic acid and ethanol (EtOH:HAc) at a 1-to-1 ratio is linked to a subsequent elongation...
Article
Full-text available
(1) Background: Biological treatment of leachate in landfill sites using anaerobic ammonium oxidation (anammox) is challenging because of the intrinsic characteristics of this complex wastewater. In this work, the scale-up and subsequent full-scale implementation of the PANAMMOX® technology (LEQUIA Research Group, Girona, Catalonia, Spain) are pres...
Article
Full-text available
New strategies in inoculation and operation of bioelectrochemical systems were used to advance in the steering of bio-electro carbon dioxide (CO2) recycling towards chemical compounds. First, the preparation of microbe coated biocathodes ex-situ with putative electroactive species with CO2 as sole carbon source was assayed. Second, CO2 feeding stra...
Article
This work aimed to study the electrification of biotrickling filters by means of Microbial electrochemical technologies (MET) to develop an easy-to-assemble and easy-to-use MET for nitrogen removal without external aeration nor addition of chemicals. Four different designs were tested. The highest ammonium and nitrate removal rates (94 gN·m-3·d-1 a...
Article
Full-text available
Renewable energies will represent an increasing share of the electricity supply, while flue and gasification-derived gases can be a promising CO2 feedstock with a heat load. In this study, microbial electrosynthesis of organic compounds from CO2 at high temperature was proposed as an alternative for valorising energy surplus and decarbonizing the e...
Presentation
C4-C6 organics production from CO2 through a two-step process by an anaerobic mixed culture. Study of each step optimal conditions
Poster
Butyric and caproic acids production through a two step platform from CO2 as the only carbon source by using a mixed culture as catalyst. First step consisted on a microbial electrochemical technology (MET) system, followed by an anaerobic gas fermentation.
Article
This study investigated the effects of the influent inorganic carbon (IC) availability on nitrifying microbial activity of a sequencing batch reactor (SBR) operated for partial-nitritation (PN) at mainstream conditions (temperature of 15 °C and low influent N concentration). By operating the reactor with influent ammonium to inorganic carbon centra...
Article
This study aimed at assessing the performance and microbial community in a granular one-stage partial nitritation-anammox sequencing batch reactor (PNA-SBR) subjected to temperature transition from 25 to 15 °C without biomass acclimation. The PNA-SBR was operated by controlling the oxygen transfer rate (OTR) according to the ammonium loading rate (...
Article
BACKGROUND Phosphorus (P) resources are limited, and to assure its supply, the coming actions must be focused on P‐recovery rather than its removal. In this sense, manure is a mining opportunity for nutrient recovery, for example, recovered as struvite. However, manure treatment is challenging due to its characteristics, such as the solid content,...
Article
BACKGROUND This study provides a methodology for recovering two essential macronutrients (potassium and phosphorus) from the liquid fraction of manure. This methodology paves the way for K‐struvite recovery from manure by determining the suitable operational conditions (pH and temperature). RESULTS The theoretical operational conditions were estab...
Conference Paper
This study integrated Computational Fluid Dynamics (CFD) and biological modeling (Activated Sludge Models) for the description of a novel anammox reactor configuration. This results in a full description of the hydrodynamics, the mixing degree of the system and biological performance within the overall reactor domain. The large recirculation of the...
Article
Manure represents an exquisite mining opportunity for nutrient recovery (nitrogen and phosphorus), and for their reuse as renewable fertilisers. The ManureEcoMine proposes an integrated approach of technologies, operated in a pilot-scale installation treating swine manure (83.7%) and Ecofrit® (16.3%), a mix of vegetable residues. Thermophilic anaer...
Poster
Full-text available
Microbial Fuel Cells (MFCs) can treat wastewater with direct electricity recovery. Electro-active bacteria (Xa) oxidise the organic content of wastewater and transfer the electrons to the anode of the MFC. However, the anode chamber often shows a more complex microbiome including heterotrophic bacteria (Xh) and methanogenic archaea (Xm). The first...
Conference Paper
Full-text available
Microbial Fuel Cells (MFCs) may provide an alternative treatment strategy for wastewaters, with direct electricity recovery. Anodophilic bacteria oxidise the organic matter present in the wastewater and transfer the electrons to the anode of the MFC. However, the anode chamber often shows a more complex microbiome, including heterotrophic bacteria...
Article
This study assesses the hydrodynamics in the anode compartment of a bioelectrochemical system (BES) when using different electrode materials (graphite rod, granular graphite, stainless steel mesh or graphite plate). For this purpose, computational fluid dynamics (CFDs) modelling was used. Granular graphite or stainless steel mesh allowed a better w...
Conference Paper
Struvite recovery from manure could contribute to assure at long term phosphorus supply. Struvite is an effective slow-release fertilizer. Bigger struvite particles will have longer effects on soil, increasing the nutrient uptake of plants/crops. In this study, the up-flow velocity was used to control particle size in a designed crystallizer, based...
Article
Full-text available
The electric performance of a Microbial Fuel Cell (MFC) fed with swine manure, and specifically the interactions between different coexisting bacterial populations are examined in relationship to the Organic Loading Rate (OLR) and External Resistance applied to the cell. Feasibility of swine manure treatment using MFCs was already demonstrated by p...
Article
Up to date a few electroactive bacteria embedded in biofilms are described to catalyze both anodic and cathodic reactions in bioelectrochemical systems (i.e. bidirectional electron transfer). How these bacteria transfer electrons to or from the electrode is still uncertain. In this study the extracellular electron transfer mechanism of bacteria wit...
Article
Denitrifying bioelectrochemical systems (d-BES) are a promising technology for nitrate removal from wastewaters. Microbial community monitoring is required to pave the way to application. In this study, for the first time flow cytometry combined with molecular biology techniques is exploited to monitor and determine the structure-function relations...
Article
Background Microbial Fuel Cells (MFCs) directly convert the chemical energy present in wastewater into electricity. Enriching exoelectrogenic bacteria in the anode biofilm is a current and challenging research target. A multiparametric control strategy, focused on Organic Loading Rate (OLR) and external resistance (Rext) parameters, is here propose...
Article
Full-text available
Biogas upgrading is an expanding field dealing with the increase in methane content of the biogas to produce biomethane. Biomethane has a high calorific content and can be used as a vehicle fuel or directly injected into the gas grid. Bioelectrochemical systems (BES) can become an alternative for biogas upgrading, by which the yield of the process...
Conference Paper
European cows and pigs jointly produce 1.27 billion ton/year of manure. Its high nutrient content of could favor its recovery as struvite (MgNH PO ·6H O), but this has been hardly investigated. Struvite is an effective slow-release fertilizer, being ideal in grasslands and forests, where fertilizers are applied once in every several years, and for...
Article
BACKGROUND: Microbial electrosynthesis represents a promising approach for renewable energy storage in which chemically stable compounds are produced using CO2 as feedstock. This report aims the continuous production of acetate through microbial electrosynthesis from CO2 and assesses how the production rates could be increased. RESULTS: A continuou...
Article
This work proves for the first time the bioelectrochemical production of butyrate from CO2 as a sole carbon source. The highest concentration of butyrate achieved was 20.2 mMC, with a maximum butyrate production rate of 1.82 mMC•d-1. The electrochemical characterisation demonstrated that the CO2 reduction to butyrate was hydrogen driven. Production...
Article
Several regions around the world present high levels of nitrate in groundwater. Due to its toxicity, nitrate must be removed before the groundwater is used as drinking- water. This study assessed how a denitrifying bioelectrochemical system could be operated to treat nitrate- polluted groundwater. It evaluated the cathode potential (from +597 to -7...
Conference Paper
Full-text available
Microbial Fuel Cells (MFCs) are considered to be an environmental friendly energy conversion technology. The main limitations that delay their industrialization include low current and power densities achievable and high start-up time. Maximum Power Point Tracking (MPPT) has been proposed as a method to enhance MFCs electrical performances. The spe...
Conference Paper
Microbial fuel cells (MFCs) are one of the newest and most promising bio-approaches that remove organic matter and nitrogenfrom wastewaters with electricity generation.Due to the knowledge obtained so far using small-scale reactors,the interest on MFC scaling-uphas increased considerably.This study aimed to demonstrate that MFCs technology can beap...
Article
Anaerobic ammonium oxidation (anammox) is a cost-effective process to treat high-strength nitrogenous wastewater. Even without organic carbon input, the effluent contains bioproducts from autotrophic and heterotrophic bacteria. In this work, excitation-emission matrix (EEM) fluorescence spectroscopy was used to characterize the effluent dissolved o...
Article
Full-text available
Phosphate’s cycle has been modified over the last centuries, as a result of urbanization, deforestation and intensification of stock farming and agriculture (Bergmans, 2011). There is no substitute for phosphorus in nature, as the two main sources for phosphate are guano and rocks containing concentration of the calcium phosphate mineral called ‘ap...
Article
Partial nitritation (PN) reactors treating complex industrial wastewater can be operated by alternating anoxic-aerobic phases to promote heterotrophic denitrification via NO2(-). However, denitrification under stringent conditions can lead to high N2O production. In this study, the suitability of including anoxic phases in a PN-SBR treating real in...
Article
Hydrogen represents a promising clean fuel for future applications. The biocathode of a two-chambered microbial electrolysis cell (biotic MEC) was studied and compared with an abiotic cathode (abiotic MEC) in order to assess the influence of naturally selected microorganisms for hydrogen production in a wide range of cathode potentials (from -400 t...
Article
This study investigates the microbial community dynamics in an intermittently aerated partial nitritation (PN) SBR treating landfill leachate, with emphasis to the nosZ encoding gene. PN was successfully achieved and high effluent stability and suitability for a later anammox reactor was ensured. Anoxic feedings allowed denitrifying activity in the...
Article
BACKGROUND Groundwater quality is threatened by nitrate accumulation in several regions around the world. Nitrate must be removed from contaminated groundwater to use it as drinking water. Microbial fuel cells (MFCs) can be used for autotrophic denitrification. Thus, the use of MFCs is a potential alternative to using traditional methods for treati...
Conference Paper
Summary of key findings � -The operational conditions and designs are selecting factors of cathode community diversity. � -Different ammonia-oxidising bacteria (AOB) were identified in MFCs designs. In MFC-2, bacteria (Nitrosomonas europaea) nitrified faster than in MFC-1 (Nitrosospira sp.). � -In both MFC designs, the highest microbial diversity w...
Article
Full-text available
The biocathodic reduction of nitrate in Microbial Fuel Cells (MFCs) is an alternative to remove nitrogen in low carbon to nitrogen wastewater and relies entirely on microbial activity. In this paper the community composition of denitrifiers in the cathode of a MFC is analysed in relation to added electron acceptors (nitrate and nitrite) and organic...
Article
The aim of this study was to evaluate the suitability to couple anammox process with advanced oxidation processes (AOPs) to treat mature landfill leachate with high nitrogen and non-biodegradable organic matter concentrations (2309±96mgN-TNL(-1) and 6200±566mgCODL(-1)). The combination of a partial nitiration-anammox system coupled with two AOP-bas...
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