Alejandro Ramos

Alejandro Ramos
Universidad de Las Palmas de Gran Canaria | ULPGC · Department of Processes Engineering

Doctor of Engineering

About

45
Publications
10,041
Reads
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333
Citations
Citations since 2016
28 Research Items
211 Citations
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
Additional affiliations
October 2003 - present
Universidad de Las Palmas de Gran Canaria
Position
  • Professor (Associate)

Publications

Publications (45)
Article
Full-text available
Desalination is an opportunity to get fresh water for irrigation and for drinking. Reverse Osmosis (RO) for sea water desalination is a solution for the high demand for water in Atlantic islands. The most efficient process to get desalinated water is RO; however, it is necessary to study what to do with the RO membranes used at the end of their lif...
Article
Full-text available
A real-scale application experience Natural Treatment Systems for Wastewater (NTSW) operating in continues with livestock farms for one year. These systems are based on digesters, subsurface vertical flow constructed wetlands (SVFCW) and facultative ponds. Chemical Oxygen Demand removal efficiency (CODRE) has obtained between 70 and 90%. Likewise,...
Article
Full-text available
The potential application of renewable energies is diverse, and they have demonstrated their suitability in their application to the size and operation of activities. Rural tourism is one of the products with the greatest potential for growth within the tourist offer of the island of Gran Canaria, as it combines sustainable development and respect...
Article
Full-text available
This paper reports results of a 5-year trial study of a natural treatment system for wastewater (NTSW) on a livestock pig farm on Gran Canaria (Canary Islands, Spain). The pilot plant consist of a rotary screen, a first-generation multi-chamber digester, and two horizontal subsurface flow treatment wetlands (HSFCW) with a pond installed between the...
Article
Full-text available
The purpose of our study was to reduce the carbon footprint of seawater desalination plants that use reverse osmosis membranes by introducing on-site renewable energy sources. By using new-generation membranes with a low energy consumption and considering wind and photovoltaic energy sources, it is possible to greatly reduce the carbon footprint of...
Article
Full-text available
This article shows the optimization of the reverse osmosis process in seawater desalination plants, taking the example of the Canary Islands, where there are more than 320 units of different sizes, both private and public. The objective is to improve the energy efficiency of the system in order to save on operation costs as well as reduce the carbo...
Article
Full-text available
Reverse osmosis (RO) is the most widely used technology for seawater desalination purposes. The long-term operating data of full-scale plants is key to analyse their performance under real conditions. The studied seawater reverse osmosis (SWRO) desalination plant had a production capacity of 5000 m3/d for irrigation purposes. The operating data suc...
Article
Full-text available
The desalination of seawater is one of the most established techniques in the world. In the middle of the 20th century this was achieved using water evaporation systems, later with reverse osmosis membranes and nowadays with the possibility of capacitive deionization membranes. Capacitive deionization and membrane capacitive deionization are an eme...
Article
Full-text available
This article presents a proposal of an anaerobic biodigester on a laboratory scale for introducing the monitoring and sensing techniques of the growth of microorganisms according to different parameters, where the redox potential, pH, pressure, and temperature have been measured in quasi-continuous mode. For this task, a microcontroller system was...
Article
Full-text available
The cheese whey (95% composed of water) is an effluent produced in the cheese industry, of which more than 1.5 million tons are generated in Spain, constituting a serious environmental problem. The process starts with a new fermentative/enzymatic technology that totally converts whey, mainly composed by lactose, proteins, and salts, into a fermente...
Article
Full-text available
The water situation in the Canary Islands has been a historical problem that has been sought to be solved in various ways. After years of work, efforts have focused on desalination of seawater to provide safe water mainly to citizens, agriculture, and tourism. Due to the high demand in the Islands, the Canary Islands was a pioneering place in the w...
Article
Supercapacitors are increasingly used as energy storage elements. Unlike batteries, their state of charge has a considerable influence on their voltage in normal operation, allowing them to work from zero to their maximum voltage. In this work, a theoretical and practical analysis is proposed of the energy efficiency of these devices according to t...
Article
Full-text available
Anaerobic lagoons are natural wastewater treatment systems suitable for swine farms in small communities due to its low operational and building costs, as well as for the environmental sustainability that these technologies enable. The local weather is one of the factors which greatly influences the efficiency of the organic matter degradation with...
Article
Full-text available
This article shows a climate change mitigation strategy by means of membranes replacement and determination methodology of carbon footprint in reverse osmosis (RO) desalination plants, valid for all the islands, and even isolated territories in the continent. This study takes the case of study of Canary Islands, where there are more than 320 desali...
Article
Full-text available
The water-energy nexus, together with the need for sustainable management of these interconnected resources, has attracted growing attention from the scientific community. This paper focuses on this nexus from the point of view of the energy that is required by wastewater treatment plants, which are intensive energy consumers and major emitters of...
Article
Anaerobic digestion technologies offer a set of advantages when they are implemented as a primary treatment phase prior to the use of constructed wetland systems in low cost wastewater facilities. The aim of this study is to describe a model capable of reflecting the complex functioning of anaerobic lagoons, subject to continuous flux in the feed p...
Article
Full-text available
The classification, assessment, and estimation of the atmospheric corrosivity are fixed by the ISO 9223 standard. Its recent second edition introduced a new corrosivity category for extreme environments CX, and defined mathematical models that contain dose–response functions for normative corrosivity estimations. It is shown here that application o...
Article
Full-text available
In this article, a mechanistic process-based model is developed, for accurate predictions of pig farms wastewater behavior in free water constructed wetlands. Twenty-six variables were considered in order to simulate the simultaneous hydraulic, physical, biochemical and physico-chemical characteristics of different processes that are happening in t...
Article
Today, one of the main targets of seawater reverse osmosis (SWRO) membrane manufacturers is to increase boron rejection. For drinking water, the regulations in Spain are quite strict in terms of maximum boron content. The aim of this work is to propose a prediction model for average boron permeability coefficient as boric acid by evaluating the flu...
Article
The construction of the new seawater intake at reverse osmosis desalination plant located in Almeria (Spain) finished on May 2011. From this moment, the water catchment was located at 35 m depth instead of the 14 m depth of the former intake. The most significant outcome has been a new thermal scenario with lower maximum temperatures and more stabl...
Article
This paper proposes a simple design method of the RO system in RO brackish water desalination plants. This method is based on the application of maximum available recovery without scaling of any of the compounds present in the water as silica, calcium carbonate, calcium sulfate, barium sulfate, strontium sulfate, and calcium fluoride, and membrane...
Article
The reverse osmosis (RO) brackish water desalination plant described in this article has been operating without acid in the pretreatment and only using two types of antiscalants (this was the first experience of 40,000 operating hours in Canaries). This work describes the graphical evolution of all the daily operating information of the first five...
Article
This study proposes a simple design method of the Reverse osmosis (RO) system in RO brackish water desalination plants. This method is based on the application of maximum available recovery without scaling of any of the compounds present in the water as silica, calcium carbonate, calcium sulfate, barium sulfate, strontium sulfate, and calcium fluor...
Article
Full-text available
Electrochemical double-layer capacitors (EDLC), also known as supercapacitors or ultracapacitors, are devices in which diffusion phenomena play an important role. For this reason, their modeling using integer-order differential equations does not yield satisfactory results. The higher the temporal intervals are, the more problems and errors there w...
Article
This paper proposes a simple calculation method to estimate the maximum conversion level in reverse osmosis (RO) brackish water desalination plants. The method is based on the scaling potential of different compounds found in the water to be treated. These compounds include silica, calcium carbonate, calcium sulphate, barium sulphate, strontium sul...
Article
This paper proposes a strategy control for energy storage systems with Electrochemical Capacitors. Electrochemical capacitors are electrochemical devices, which have a similar behavior that conventional capacitor, but with much more capacitance. In this work the electrochemical capacitor is used as an energy storage, with the advantage of its high...
Article
This paper provides a Fractional Equivalent Impedance for combinations of Electrochemical Double Layer Capacitors (EDLCs). The application of the fractional calculus for modeling EDLCs is a novel way to get simpler and more precise models. On using the impedance spectroscopy method, experimental results for different EDLC combinations have been obt...
Conference Paper
Full-text available
The application of the fractional calculus for modeling electrochemical double layer capacitors is a novel way to get simpler and precise models. This paper provides a summarized report of several models of Electrochemical Double Layer Capacitors (EDLC). From classical models based on simple structures composed by networks of passive elements (RLC)...
Conference Paper
The application of the fractional calculus for modeling electrochemical double layer capacitors is a novel way to get simpler and precise models. By means of the method of impedance spectroscopy, experimental results for different values of these have been obtained. In this paper several classical mathematical models are studied and a different met...
Conference Paper
Ultracapacitor are devices used to store energy in which diffusion phenomena are important. This paper obtains an identification of a double layer ultracapacitor using impedance spectroscopy. It has been observed from experimental data, that the ultracapacitor has a fractional behaviour. In order to get a good accuracy, conventional models use a lo...
Article
The increase of nonlinear loads in networks involves rises in harmonic currents, resulting in voltage distortion that can affect other sensitive loads. The series voltage compensators are the devices used to reduce voltage deformation in networks of nonnegligible impedance. The control technique of the series compensator is one factor which can imp...
Article
An analysis and simulations results of several linearization methods for the model of the buck converter by means of pulse width modulation are presented in this paper. The use of the pulse width modulation causes, in systems like the buck converter, nonlinear models. The operation of this system is based on the control of the output voltage of a p...
Article
Full-text available
Resumen En este artículo se exponen y desarrollan varios métodos para el control de un convertidor Buck de potencia en modo deslizamiento cuando la carga es variable. Se estudiará el método clásico de control en modo deslizamiento y un sistema de control basado en modulación por ancho de pulso (PWM) que admite bajas frecuencias de conmutación con u...
Article
Full-text available
The increase of nonlinear loads in networks involves rises of harmonic currents, resulting in distortions of the voltage that can affect other sensitive loads. The series voltage compensator are the devices used to reduce voltage deformation in networks of non negligible impedance. The control of the series compensator is an important problem to ob...

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