Mabel Mora

Mabel Mora
University of Vic | UVIC · Beta Tech Center

PhD

About

44
Publications
5,538
Reads
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555
Citations
Additional affiliations
January 2020 - present
University of Vic
Position
  • PostDoc Position
Description
  • Participating in the European projects: DECOST (DECentralised COmposting in Small Towns; ENI CBC Med) and FERTIMANURE (Innovative nutrient recovery from secondary sources – Production of high-added value FERTIlisers from animal MANURE; H2020).
June 2019 - January 2020
Duke University
Position
  • Research Associate
Description
  • Enrichment of mixed cultures in carbon dioxide biological scavengers, such as PHA chemolithotrophic accumulating bacteria.
December 2018 - June 2019
University of Vic
Position
  • PostDoc Position
Education
September 2011 - December 2014
Autonomous University of Barcelona
Field of study
  • Environmental Science and Technology
September 2010 - September 2011
Autonomous University of Barcelona
Field of study
  • Environmental Studies
September 2006 - September 2009
Autonomous University of Barcelona
Field of study
  • Chemical Engineering

Publications

Publications (44)
Article
Full-text available
The production of biogas through anaerobic digestion implies the generation of 90–95% of digested raw material, namely digestate. A nutrient-rich stream is generally applied to cropland to enhance yields, due to its high abundance of nutrients. Nevertheless, the intensive digestate farming brings about nutrient saturation and groundwater contaminat...
Article
Abstract Current trends of livestock expansion and associated mass production of manure bring a net import of nutrients that have led to a significant excess in many areas. The implementation of an efficient and more economical technology solution to recover and re-use nutrients from raw or digested wastes is essential and will reduce the need for...
Article
Full-text available
Flue gases contain SO2 and NOx that can be treated together for elemental sulphur recovery in bioscrubbers, a technology that couples physical-chemical and biological processes for gaseous emissions treatment in a more economic manner than classical absorption. Sequential wet absorption of SO2 and NOx from flue gas is thoroughly studied in this wor...
Article
The intense productivity related to the livestock sector has led to the development and application of different technologies and procedures to mitigate, mainly, NH3 emissions. The addition of ion-exchange-based additives, such as Active NS, is one of the practices that may help reducing nitrogen emissions. In this study, the use of Active NS to mi...
Article
Full-text available
In this study, the long-term performance and microbial dynamics of an Upflow Anaerobic Sludge Blanket (UASB) reactor targeting sulfate reduction in a SOx emissions treatment system were assessed using crude glycerol as organic carbon source and electron donor under constant S and C loading rates. The reactor was inoculated with granular sludge obta...
Article
Full-text available
Biotrickling filters are one of the most widely used biological technologies to perform biogas desulfurization. Their industrial application has been hampered due to the difficulty to achieve a robust and reliable operation of this bioreactor. Specifically, biotrickling filters process performance is affected mostly by fluctuations in the hydrogen...
Article
Background Biological treatment of effluents containing H2S and ammonium are of great interest as both compounds can trigger serious environmental problems when disposed of. The aim of this study was to optimize the production of biosulfur from the partial oxidation of sulfide in sulfide‐ and ammonium‐containing streams. Biological performance was...
Article
In environmental biotechnology applications for wastewater treatment, bacteria-based bioprocesses are mostly implemented; on the contrary, the application of fungi-based bioprocesses, is still challenging under non-sterile conditions. In a previous lab-scale study, we showed that, when specific tannins are used as sole carbon source, fungi can play...
Article
A heterogeneous respirometer (HR) was coupled for the first time to a microelectrode monitoring system specifically designed for dissolved oxygen (DO) measuring within the biofilm. Monitoring of the oxygen concentration in the gas and liquid phases was complemented with pioneer monitoring of DO performed simultaneously and continuously at multiple...
Article
A bioscrubbing process named SONOVA has been developed, tested and assessed herein to valorize flue gases containing SOx. The process consists in a first scrubbing stage, to absorb and oxidize SO2 to sulfate, followed by a two-step biological stage. It consists of (1) an up-flow anaerobic sludge (UASB) reactor to reduce sulfate to sulfide with crud...
Article
Bioscrubbers are an environmental-friendly alternative to valorize SO2 contained in flue gases to obtain elemental sulfur as final value-added product. The bottleneck of a SO2 bioscrubber relies on the heterotrophic reduction of the absorbed SO2 to obtain sulfide. In this study, the performance and stability of a sulfidogenic Upflow Anaerobic Sludg...
Article
SOx contained in flue gases and S-rich liquid effluents can be valorized to recover elemental sulfur in a two-stage bioscrubbing process. The reduction of sulfate to sulfide is the most crucial stage to be optimized. In this study, the long-term performance of an up-flow anaerobic sludge blanket (UASB) reactor using crude glycerol as electron donor...
Article
Full-text available
Titrimetry is a well-established technique that has not been previously used in bioreactors for waste gas treatment. This work explored the information behind titrimetric data such as the proton production (HP) and the proton production rate (HPR) to evaluate their suitability for the on-line monitoring of the biological activity of an aerobic biot...
Article
Tannins are polyphenolic compounds produced by plants that are used in the vegetable tanning of leather at industrial scale. Quebracho tannin and Tara tannin are intensively used by the tanning industry and are two of the most recalcitrant compounds that can be found in tannery wastewaters. In this study two reactors fed with Quebracho tannin and T...
Article
Effluents containing great amounts of oxidized sulfur compounds, such as sulfate or sulfite, can be valorized as elemental sulfur from a sequential reduction-oxidation biological process. However, the most important, challenging step to be optimized is the reduction of sulfate. The present study aimed at seeking out the optimal conditions to promot...
Article
Feedforward control was implemented at lab-scale in an aerobic and an anoxic biotrickling filter (BTF) operating under fluctuating H2S loading rate (LR) conditions in order to show the capabilities and added value of this control strategy. Dynamic, long-term tests with variable H2S LR were performed to simulate disturbances in the inlet gas concent...
Poster
The treatment of SOx contained in flue gases generates S-rich liquid effluents that can be valorized through a two-stage biological process. The first stage consists of reducing sulfate to sulfide to be partially oxidized to sulfur in a second stage. The first biological stage is catalyzed by sulfate-reducing bacteria (SRB) and can be performed und...
Conference Paper
Biological desulfurization has been studied during the last decades as a good option to treat sulfide rich streams as those generated for example from biogas desulfurization, anaerobic digestion of sulfate-rich wastewater or wastewater from sewer systems. These streams cause negative environmental impacts and it is necessary to implement efficient...
Conference Paper
An improved monitoring technique of biofilm activity, named heterogeneous respirometry (HR) was applied to characterize sulfide-oxidizing biofilms. In the HR, the aerobic oxidation of sulfide can be studied directly within the colonized packing material. The HR can also be mathematically described considering the gas, liquid and biofilm phases. Nev...
Poster
Two upflow anaerobic sludge blanket reactors were used to treat sulfate with crude glycerol as carbon source. UASB-1 was operated for 260 days with a SLR of 135±16 mg S L-1 h-1 an a TOC/S ratio ranging from 0.8 to 2.8. A sharp diminishment of the OLR followed by a pH shock caused a complete degranulation of the biomass which was not recovered in 4...
Conference Paper
In this study, respirometry of biofilms grown on an heterogeneous media is advised as a valuable technique for characterizing mass transport and biological activity. H2S-oxidizing biofilms grown attached to Pall rings in a biotrickling filter bed were used. Controlled flows of liquid and H2S-containing air were recirculated through a closed, batch...
Book
Full-text available
This book addresses the obtention and use of biogas as an energy source, which is produced by anaerobic digestion of organic material from various sources (landfills, municipal waste treatment plants, agro-industrial waste and energy crops among others). The European Union, China and to a lesser extent North America are currently the main producers...
Article
Full-text available
A dynamic model describing physical-chemical and biological processes for the removal of high loads of H2S from biogas streams in biotrickling filters (BTFs) was developed, calibrated and validated for a wide range of experimental conditions in a lab-scale BTF. The model considers the main processes occurring in the three phases of a BTF (gas, liqu...
Conference Paper
In addition to a range of S-rich effluents from industrial wastewaters, exhaust flue gases obtained from fossil fuels combustion or other industrial activities may contain large amounts of SOx which must be removed before their emission to the atmosphere since affect adversely human health, livestock and plants among others. After chemical absorpti...
Conference Paper
Full-text available
The H2S loading rate (LR) in biotrickling filters (BTFs) varies due to diurnal and seasonal biogas flow and H2S inlet ([H2S]in) concentration variations, thus affecting the BTF performance in terms of H2S removal efficiency (RE) and sulfate selectivity. The airflow rate (AFR) and the trickling liquid velocity (TLV) constitute potential control hand...
Article
Full-text available
BACKGROUND Biological oxidation in biotrickling filters of high H2S loads contained in biogas streams still requires further study to reduce elemental sulfur accumulation due to limited gas-liquid oxygen mass transfer inside biotrickling filters bed. Reduction of elemental sulfur accumulation may be improved by regulating the main manipulated varia...
Article
Full-text available
Respirometry was used to reveal the mechanisms involved in aerobic biological sulfide oxidation and to characterize the kinetics and stoichiometry of a microbial culture obtained from a desulfurizing biotrickling filter. Physical-chemical processes such as stripping and chemical oxidation of hydrogen sulfide were characterized since they contribute...
Poster
Full-text available
Biological hydrogen sulfide (H2S) removal in biotrickling filters (BTFs) has been widely proved to be an efficient technology in order to clean biogas for upstream energy recovery processes . However further research is needed in order to optimize biological desulfurization processes to enhance process reliability and therefore a greater applicatio...
Poster
Full-text available
Kinetic and stoichiometric characterization of immobilized biomass cultivated in biofiltration processes is not such a simply procedure since the biofilm is attached to a packing material which must be withdrawn from the biofilter or the biotrickling filter to perform characterization assays. Respirometry is a well-established technique that has be...
Conference Paper
A mathematical dynamic model describing biological removal of high loads of H2S from biogas streams through a biotrickling filter (BTF) was developed, calibrated and validated to a range of specific experimental conditions of a lab-scale BTF. This model takes into account the main processes occurring in the three phases of the desulfurizing BTF (ga...
Conference Paper
A mathematical dynamic model describing biological removal of high loads of H2S from biogas streams through a biotrickling filter (BTF) was developed, calibrated and validated to a range of specific experimental conditions of a lab-scale BTF. This model takes into account the main processes occurring in the three phases of the desulfurizing BTF (ga...
Article
The elimination capacity of gaseous H2S biofiltration can be limited either by mass transfer or bioreaction in the biofilm. Assessment of the biological activity of immobilized cells (biofilm) usually implies morphological and physiological changes during the adaptation of cells to respirometric devices operated as suspended cultures. In this study...
Article
In this work the kinetics of a number of sulfide-oxidizing nitrate-reducing (SO-NR) cultures acclimated and not acclimated to nitrite were characterized. Anoxic respirometry coupled to kinetic modeling of respirometric profiles was the methodology used to study the two-step denitrification associated to thiosulfate oxidation. Autotrophic denitritat...
Article
Anoxic respirometry was applied to characterize a sulfide-oxidizing nitrate-reducing (SO-NR) culture obtained from an anoxic biogas desulfurizing biotrickling filter treating high loads of H2S. Immobilized biomass extracted from the biotrickling filter was grown in a suspended culture with thiosulfate as electron donor to obtain the biomass growth...
Article
Full-text available
tBiotrickling filters for biogas desulfurization still must prove their stability and robustness in the longrun under extreme conditions. Long-term desulfurization of high loads of H2S under acidic pH wasstudied in a lab-scale aerobic biotrickling filter packed with metallic Pall rings. Reference operating con-ditions at steady-state corresponded t...
Article
h i g h l i g h t s Modeling of proton production rate permitted the characterization of carbon dioxide stripping. Thiosulfate oxidation by a sulfide-oxidizing nitrate-reducing consortium was characterized. Biological proton production rate was determined with high sensitivity. Stoichiometry of two-step denitrification was solved by coupling respir...
Article
Full-text available
Monitoring the biological activity in biotrickling filters is difficult since it implies estimating biomass concentration and its growth yield, which can hardly be measured in immobilized biomass systems. In this study, the characterization of a sulfide-oxidizing nitrate-reducing biomass obtained from an anoxic biotrickling filter was performed thr...
Article
Autotrophic denitrification is a suitable technology to simultaneously remove oxidised nitrogen compounds and reduced sulphur compounds yielding nitrogen gas, sulphur and sulphate as the main products. In this work, several batch tests were conducted to investigate the cross effect of temperature, pH and free ammonia on the autotrophic denitrificat...
Conference Paper
Monitoring of the biological activity in a desulfurizing biotrickling filter (BTF) is difficult since it implies estimating biomass concentration and growth yield coefficient, which are parameters that can hardly be measured when using immobilized biomass. In this study, the characterization of a sulfide-oxidizing biomass obtained from an anoxic BT...
Conference Paper
The biofiltration of H2S containing biogas through biotrickling filters is a promising technology for purification. However, the elucidation of the biomass activity and biodegrading mechanisms found inside of these reactors are highly desirable to be studied since play an important role in biofiltration modeling. Respirometry is a technique that ha...
Conference Paper
Full-text available
Biotrickling filtration is a biological technology employed as a pre-treatment unit to remove impurities such as reduced sulfur compounds (RSC) from energy-rich effluents like biogas. Determination of the stoichiometric and kinetic parameters of the biomass involved in biological desulfurization processes is particularly necessary to design, evalua...
Poster
The use of biogas as a renewable energy source requires pre-treatment operations to remove contaminants, such as hydrogen sulfide, for the further usage of biogas in cogeneration engines. Biogas desulfurization can be performed efficiently in biotrickling filters under both aerobic and anoxic conditions. However, there is still a lack of knowledge...

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Projects

Projects (3)
Archived project
The project proposes the study and optimization of the biological oxidation of H2S under aerobic and anoxic conditions coupled to the control of the operation of the biorreactor, to the improvement of the oxygen mass transfer, the optimization of the operating conditions through the use of respirometric techniques, process modelling and a complete characterization of biorreactor microbial populations by means of molecular biology techniques. From data obtained in the systems developed along the project we will be able to optimize industrial treatment systems using both economical and ecological criteria in the treatment of real effluents with the collaboration of two companies interested in the project.
Project
The main objective of the project is the optimization of biogas desulfurization processes in biotrickling filters from the improved understanding of the biological processes of oxidation of H2S under anoxic and aerobic conditions. The project proposes the use of a range of techniques such as the titrimetry and respirometry for process monitoring and for defining the degradation mechanisms and obtaining the biological degradation rates; the use of advanced molecular biology techniques based on massive sequencing of genetic material for the identification and monitoring of populations; and the use of microsensors for the characterization of biofilms.
Project
This project faces the challenge of developing a comprehensive treatment process for SOx and NOx from flue gases by economical, robust and environmentally friendly biological methods that also take into account the reuse of energy and resources in process development as well as residues valorization. The proposed process is based on i) a first double stage for selective absorption of SOx and NOx, ii) a second biological step catalyzed by sulfate-reducing microorganisms (SRB) for reducing the sulfate / sulfite mixture from the first absorption stage to hydrogen sulfide, and iii) a third biological stage catalyzed by sulfide-oxidizing microorganisms (SOB) for the oxidation of hydrogen sulfide to elemental sulfur and its subsequent recovery. The competitiveness of the process is based on the use of biological processes and the possibility, depending on the treated gas characteristics, of i) recovering elemental sulfur as a value added product, ii) using the energy obtained for drying sulfur iii) recycling liquid effluents to optimize process economy stages gas absorption and maximize capacity of the bioreactor in the sulfate-reducing stage. iii) reusing liquid effluents form the process to optimize economical aspects of absorption steps while maximizing the capacity of the sulfate-reduction bioreactor.