Jose M Fernandez-Sevilla

Jose M Fernandez-Sevilla
Universidad de Almería | UAL · Department of Engineering

About

137
Publications
43,985
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10,087
Citations
Citations since 2016
39 Research Items
6225 Citations
201620172018201920202021202202004006008001,000
201620172018201920202021202202004006008001,000
201620172018201920202021202202004006008001,000
201620172018201920202021202202004006008001,000

Publications

Publications (137)
Article
Full-text available
Primary urban wastewater was treated in outdoor raceways using microalgae-bacteria consortia dominated by Scenedesmus almeriensis. The current study aimed at assessing the effect of operational conditions, namely, culture depth and dilution rate, on the following: (i) biomass productivity, (ii) the nutrient removal capacity and (iii) the compositio...
Article
Tubular photobioreactors (TPBRs) are closed devices used for the mass culture of microalgae. TPBRs are supposed to be well-mixed, but the influence of their specific fluid dynamics in photosynthesis efficiency has never been studied in detail. Here, we use Computational Fluid Dynamics (CFD) coupled to a dynamic photosynthesis model to analyze the e...
Article
Full-text available
Photo-respirometric tecniques are applied for evaluating photosynthetic activity in phototrophic organisms. These methods allow to evaluate photosynthetic response under different conditions. In this work, the influence of nutrient availability (nitrate, ammonium, and phosphate) on the photosynthesis and respiration of Scenedesmus almeriensis was s...
Article
Raceway photobioreactors (RWPs) are the most common and affordable device for the mass culture of microalgae but due to geometry and the requirement of low input power, its photosynthetic performance is low. The fluid dynamics of RWPs have been studied for information such as energy dissipation and shear rate, CFD has never been used to analyze pho...
Article
Full-text available
This paper presents a novel simulation tool to understand and analyze biological models for wastewater treatment processes using microalgae. The models for this type of processes are very complex to be analyzed because of the very different phenomena, variables and parameters involved. The model already included in the tool has been validated at co...
Article
In this work, the design and hydrodynamic of a 500 m² raceway bioreactor were optimized using Computational Fluid Dynamics (CFD). First, the influence of the bend type (traditional, isle partition and baffle partition) and the liquid velocity was studied, after that the dynamic behavior of the optimal configuration was analyzed. A monophasic analys...
Article
Full-text available
Microalgae-bacteria consortia have been proposed as alternatives to conventional biological processes to treat different types of wastewaters, including animal slurry. In this work, a microalgae-bacteria consortia (ABACO) model for wastewater treatment is proposed, it being calibrated and validated using pig slurry. The model includes the most rele...
Article
Full-text available
Animal production inevitably causes the emission of greenhouse gases and the generation of large amounts of slurry, both representing a serious environmental problem. Photosynthetic microorganisms such as microalgae and cyanobacteria have been proposed as alternative strategies to bioremediate agricultural waste while consuming carbon dioxide and p...
Article
In this article, the influence of culture conditions (irradiance, temperature, pH, and dissolved oxygen) on the photosynthesis and the respiration rates of microalgae–bacteria consortia in wastewater treatment was analyzed. Specifically, some short photo‐respirometric experiments, simulating outdoor raceway reactors, were performed to evaluate the...
Article
This work studies microalgae production using urban primary wastewater as the only nutrient source in a pilot-scale thin-layer cascade photobioreactor (TLPBR). The experiments were carried out by operating the photobioreactor in semi-continuous mode at a constant dilution rate (D = 0.3 days⁻¹) uninterrupted over ten months. The TLPBR was effective...
Article
The use of microalgae-bacteria consortia for wastewater treatment involves an eco-friendly alternative for sustainable wastewater treatment and an economic way for producing microalgal biomass without nutrient cost [1–3]. Microalgae-bacteria consortia systems are especially complex and vary as a function of the environmental and operational condit...
Article
In this paper, a new photo-respirometry method for determining the rates of the main metabolic processes of microalgae-bacteria consortia in microalgae-based wastewater treatment processes has been developed and tested. The proposed protocol consists on applying dark and light periods to a microalgae-bacteria consortium in the presence of different...
Article
Humans are no strangers to the consumption of Spirulina as already in the sixteenth century Spirulina was harvested from Lake Texcoco and consumed in markets in Tenochtitlan (today Mexico City). Nowadays, microalgae are being incorporated into many food formulations. Most of these use microalgae as a marketing strategy or as a colouring agent. Howe...
Chapter
Today, agro-industry is a key economic sector worldwide with a large associated generation of wastewaters. These wastewaters entail a hazard to the environment and a waste of valuable organic matter and nutrients. The use of microalgae to support an efficient and low cost treatment of agro-industrial wastewaters along with a sustainable resource re...
Chapter
In this chapter, the most relevant factors determining the selection, design, and performance of microalgae production systems are analyzed. The starting point is to define the final purpose of the facility, because this determines the overall design of the process. Next, the requirements of the selected microalgae strains are discussed, because th...
Article
Full-text available
Background Microalgae are attracting much attention as a promising feedstock for renewable energy production, while simultaneously providing environmental benefits. So far, comparison studies for microalgae selection for this purpose were mainly based on data obtained from batch cultures, where the lipid content and the growth rate were the main se...
Article
The improvement of photosynthetic efficiency in a 100 m ² raceway reactor by enhancement of light regime to which the cells are exposed is here reported. From Computational Fluid Dynamics it was calculated that the light exposure times ranged from 0.4 to 3.6 s while the exposure times to darkness were much longer, from 6 to 21 s. It was demonstrate...
Article
Accurately assessing the influence of light/dark changes on the productivity of microalgal cultures is currently a complicated task that requires the use of a set of differential equations. A simple, algebraic equation that allows quantifying the effect of the frequency of light on the photosynthetic response of microalgae under varying light is pr...
Article
Full-text available
In this chapter the relevance of microalgae-based processes for the recovery of nutrients contained in wastewaters is reviewed. The fundamentals of the process are discussed from the biological and engineering standpoints and it is shown that on this type of processes the nutrient recovery capacity is mainly a function of solar radiation availabili...
Chapter
Carotenoids are widespread substances with important physiological roles, and some of them, such as lutein, astaxanthin, or vaucherioxanthin, are high-value products that can be used as high-quality food color and antioxidants, and some have an alleged role in the prevention of disorders such as AMD. Carotenoid extracts are currently obtained from...
Article
An experimental characterization of the performance of two multi-channel spiral-wound air-gap membrane distillation modules at commercial-scale was carried out for seawater desalination. The only difference between them was the membrane surface areas: 7.2 m² and 24 m² and thus the length of the channels (1.5 and 5 m respectively). The influence of...
Article
Methane production from pretreated and raw mixed microalgae biomass grown in pig manure was evaluated. Acid and basic pretreatments provided the highest volatile solids solubilisation (up to 81%) followed by alkaline-peroxide and ultrasounds (23%). Bead milling and steam explosion remarkably increased the methane production rate, although the highe...
Chapter
The economic analysis of biomass production is a critical step in ensuring the success of any microalgae-based industry. Until recently, only small-scale facilities of less than 10 ha have been in operation, but now large-scale facilities of more than 200 ha are being built and operated. Moreover, specific machinery and technologies are being adapt...
Article
In this paper, a commercial spiral wound PGMD module was modeled and optimized for seawater desalination using Response Surface Methodology (RSM). Permeate flux (Pflux) and specific thermal energy consumption (STEC) were the main performance parameters to optimize, while evaporator inlet temperature (Tevap), condenser inlet temperature (Tcond) and...
Article
At Plataforma Solar de Almería (PSA), different commercial spiral-wound MD modules were tested coupled to a solar thermal field composed of stationary flat plate solar collectors. One of them is the Solar Spring module with a permeate-gap membrane distillation (PGMD) configuration. Two modules from Aquastill based on a configuration of air-gap memb...
Article
Full-text available
In this paper we study the outdoor production of Tisochrysis lutea in pilot-scale tubular photobioreactors (3.0 m3). Experiments were performed modifying the dilution rate and evaluating biomass productivity and quality, in addition to the overall performance of the system. Results confirm that T. lutea can be produced outdoors on a commercial scal...
Article
Full-text available
Microalgae have been proposed as an option for wastewater treatment since the 1960s, but still, this technology has not been expanded to an industrial scale. In this paper, the major factors limiting the performance of these systems are analysed. The composition of the wastewater is highly relevant, and especially the presence of pollutants such as...
Article
The real light pattern in photobioreactors - a gradual variation of irradiance - differs from the widely accepted simplification of considering it a succession of square, light and dark periods. In this work we will demonstrate that the dynamic model of photosynthesis proposed by Camacho Rubio et al. accurately predicts photosynthetic responses eli...
Article
Solar driven photocatalysis is considered as an environmental friendly treatment for micropollutant removal from secondary wastewater treatment plant effluents. The photo-Fenton process is efficient in persistent organic pollutant degradation and the use of low cost reactors with variable light path length such as raceway pond reactors (RPR) has be...
Article
Isochrysis galbana is a widely-used strain in aquaculture in spite of its low productivity. To maximize the productivity of processes based on this microalgae strain, we have developed a model considering the influence of irradiance, temperature, pH and dissolved oxygen concentration on the photosynthesis and respiration rate. Results demonstrate t...
Article
Full-text available
In this paper, we have studied the outdoor production of the freshwatermicroalgae Scenedesmus sp. in two open reactors (32m2): thin-layer (1.2m3) and raceway (4.4 m3), using centrate fromanaerobic digestion as the sole nutrient source. The aim was to recover valuable nutrients (nitrogen and phosphorus) from effluents in order to maximize biomass pr...
Article
This paper focuses on the selection of native microalgae strains suitable for wastewater treatment and biofuel production. Four Chlorophyceae strains were isolated from North-eastern Tunisia. Their performances were compared in continuous mode at a 0.3 1/day dilution rate. The biomass productivity and nutrient removal capacity of each microalgae st...
Patent
La invención consiste en un proceso de aprovechamiento energético de biomasa vegetal que permite aprovechar el calor contenido en la biomasa para la calefacción de cultivos protegidos y/o sistemas, así como recuperar el CO2 contenido en los gases de combustión generados para ser utilizado en sistemas de enriquecimiento carbónico de atmósferas, como...
Article
Full-text available
Microalgae, which are promising candidates for biodiesel production, possess a robust cell wall which prevents the release of intracellular lipids in the medium. The breaking of the algal cell wall for lipid releasing can be energy-intensive. The direct or in situ supercritical transesterification method is considered to have the potential to disru...
Article
In this work, we studied the potential use of secondary-treated wastewater as nutrient source in the production of freshwater microalgae strains. Experiments were performed indoors in a semicontinuous mode, at 0.3 day−1, simulating outdoor conditions. We demonstrated that all the tested strains can be produced by using only secondary-treated wastew...
Article
In this paper freshwater microalgae production is studied using centrate from anaerobic digestion as the only nutrient source. The objective is not only to maximize biomass productivity but also to eliminate contaminants in order to release water which is clean enough for reuse in compliance with regulations. Experiments were performed indoors usin...
Article
Humans are not capable of synthesizing carotenoids de novo and thus, their presence in human tissues is entirely of dietary origin. Consumption of essential carotenoids is reduced due to the lower intake of fruits and vegetables. Microalgae are a good source of carotenoids that can be exploited. In the presente work, carotenoids rich extracts from...
Article
Full-text available
The aim of this paper is to solve problems that may arise in microalgae cultivation facilities at a hatchery in such a way that its activities are not disrupted. Thus, the effect of storage conditions (time, initial biomass concentration, presence or absence of light, addition of preservatives and conservation atmospheres) on cell viability, evolut...
Chapter
The photobiological production of H2 is a subject that has been studied with great intensity over the past 50 years using different approaches; direct or indirect biophotolysis (green algae and cyanobacteria) and photo-fermentations (photosynthetic bacteria). The number of publications on the subject is impressive. However, hardly any of the produc...
Article
Full-text available
Different pilot-scale outdoor photobioreactors using medium recycling were operated in a greenhouse under different environmental conditions and the growth rates (0.1 to 0.5 day(-1)) obtained evaluated in order to compare them with traditional systems used in aquaculture. The annualized volumetric growth rate for Nannochloropsis gaditana was 0.26 g...
Article
Microalgae have been proposed as the potential source for a wide range of products, ranging from fine chemicals and pharmaceuticals to foods and feeds and as a biofuel source. However, only a few are successful on an industrial scale due to the high cost associated with the production of microalgae biomass. This chapter presents an economic analysi...
Article
In this paper, the influence of culture conditions (irradiance, temperature, pH, and dissolved oxygen) on the photosynthesis rate of Scenedesmus almeriensis cultures is analyzed. Short-run experiments were performed to study cell response to variations in culture conditions, which take place in changing environments such as outdoor photobioreactors...
Article
Full-text available
Microalgae are produced today for human and animal markets, as food-feed and source of active compounds. Microalgae can be also used in wastewater treatment and they has been proposed as biofuels source to reduce global warming problem. Whatever the final application of microalgae its production is based on the same principles as light availability...
Article
Full-text available
In this paper, the use of secondary-treated wastewater as the culture medium for the production of Muriellopsis sp. microalgal biomass is analyzed. Using this wastewater, a maximum biomass productivity of 0.5 g l(-1) day(-1) was measured, it being only 38 % lower than that achieved using the standard culture medium. Due to the low nitrogen content...
Article
The main step of the production of l-aminoacids concentrates from microalgae is the enzymatic hydrolysis. This process has to be done at the optimum temperature and pH of the enzyme in order to obtain the maximum yield. In order to keep a constant pH, NaOH (1 M) or H2SO4 (1 M) are used, depending on the reaction step. When working with pH it is not...
Article
Microalgae have been proposed as a CO(2) removal option to contribute to climate change avoidance and problems coming from the use of fossil fuels. However, even though microalgae can be used to fix CO(2) from air or flue gases, they do not permit long-term CO(2) storage because they are easily decomposed. On the other hand, microalgae can contribu...
Article
A new methodology to use efficiently flue gases as CO(2) source in the production of photosynthetic microorganisms is proposed. The CO(2) is absorbed in an aqueous phase that is then regenerated by microalgae. Carbonated solutions could absorb up to 80% of the CO(2) from diluted gas reaching total inorganic carbon (TIC) concentrations up to 2.0 g/L...
Article
The use flocculants on the recovery of freshwater microalgae is studied. Flocculants tested include metal salts, chitosan, and polyelectrolytes used in wastewater treatment processes. Influence of flocculant, but also the doses and biomass concentrations affecting biomass recovery as well as the concentration factor has been evaluated. Results show...