Luis R. López De León

Luis R. López De León
Universitat de Girona | UDG · Institut de Medi Ambient

PhD

About

22
Publications
2,822
Reads
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259
Citations
Introduction
Luis R. López De León currently works at the Laboratory of Chemical and Environmental Engineering (LEQUIA) of the University of Girona. He is currently a Marie Curie Individual Fellowship holder since February 2022 leading the project titled "The MICRO-BIO process" which aims to capture CO2 from indoor air and transform it into valuable carbon-neutral commodity chemicals by means of using microbial electrosynthesis technologies coupled with capillary microbioreactors.
Additional affiliations
April 2017 - May 2022
Duke University
Position
  • PostDoc Position
September 2016 - March 2017
Autonomous University of Barcelona
Position
  • PostDoc Position
June 2016 - August 2016
Aeris Tecnologias Ambientales S.L.
Position
  • Technician
Education
September 2011 - September 2012
Autonomous University of Barcelona
Field of study
  • Environmental Science and Technology
September 2006 - June 2010
Autonomous University of Barcelona
Field of study
  • Chemical engineering

Publications

Publications (22)
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
Micro-capillary bioreactors (1 mm ID, 10 cm long) were investigated for the biodegradation of toluene vapors as a model volatile organic compound (VOC). The intended application is the removal of VOCs from indoor air, when such microbioreactor is coupled with a microconcentrator that intermittently delivers high concentrations of VOCs to the biorea...
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
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
Full-text available
Typical biofilters and biotrickling filters used for volatile organic compounds (VOCs) control have treatment rates limited to 30−200 g m −3 h −1 , mostly because they are exposed to dilute VOC streams, have moderate biomass density and activity, and moderate mass transfer coefficients. For these reasons and the concern over releasing bioaerosols a...
Conference Paper
Typical biotrickling filters and biofilters used for VOC control have treatment rates limited to 30-200 g/m 3-h. The low elimination capacities are due to common limitations of conventional biotrickling filters such as dilute substrate and moderate biomass density and activity, rendering biofilters and biotrickling filters non-ideal for treatment o...
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...
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
Indoor air is often contaminated with volatile organic compounds (VOCs) These result from consumer products, building materials, human metabolism and activities, pollution of outdoor air and more VOCs in enclosed environments can be a health threat or reduce human performance. The problem is most acute in air and space crafts, submarines, closed i...
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...
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
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...
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
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...
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...

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Projects

Project (1)
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.