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Rubén López-Vizcaíno

Rubén López-Vizcaíno
Civil Engineering School, University of Castilla la Mancha · Geoenvironmental Engineering Group

PhD Chemical, Environmental and Materials Engineering

About

50
Publications
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1,041
Citations

Publications

Publications (50)
Article
This work reviews the recent progress in physical and mathematical modelling of electrochemically assisted soil remediation processes and focuses especially on those treatments that aim to remove organic pollution. It introduces the importance of modelling and simulation, not only to understand, but also to manage more efficiently the remediation o...
Article
This paper evaluates the combination of electrokinetic soil flushing (EKSF) with soil vapor extraction (SVE) for the removal of four hexachlorocyclohexane (HCH) isomers contained in a real matrix. Results demonstrate that the combination of EKSF and SVE can be positive, but it is required the application of high electric fields (3 V cm⁻¹) in order...
Article
The reactive transport framework ORCHESTRA was used to implement a dual porosity reactive transport system that accounts for mechanical processes relevant for confined swelling clays at full saturation. The new implementations are based on water retention data generated by molecular dynamics simulations, and on fundamental mechanical formulations....
Chapter
In this chapter, the importance of mathematical models to analyze the electrokinetic remediation process is highlighted. Due to the amount of coupled physicochemical, electrochemical, and electrokinetic phenomena that take place in this soil treatment, it is necessary to develop conceptual models and numerical tools that, combined with experimental...
Chapter
Soil is a natural porous material with fluids in its voids. The distribution of the space occupied by solid particles, water, and gases is fundamental to understanding soil behavior under the influence of external actions. The mineralogical and geochemical composition of the system and the characteristics of solid–liquid–gas complex under different...
Article
This work aims to shed light on the scale-up a combined electrokinetic soil flushing process (EKSF) with permeable reactive barriers (PRB) for the treatment of soil spiked with clopyralid. To do this, remediation tests at lab (3.45 L), bench (175 L) and pilot (1400 L) scales have been carried out. The PRB selected was made of soil merged with parti...
Presentation
The deep geological repository concept for spent nuclear fuel considers many safety elements. Among them, compacted bentonite has been selected as the primary engineering barrier between the encapsulated radioactive waste and the host rock. Thermo-hydro-mechanical behaviour of this material has been studied in detail from an experimental and numeri...
Article
The water retention curve deduced with low water content data allows the modelling of the bentonite void ratio associated with the pores located inside the clay aggregates, or micropores. However, if both the water content and the microporosity continue to increase, the latter can no longer be directly obtained from the former, because, in that cas...
Article
The increasing needs for modelling of reactive transport phenomena in different areas of environmental modelling have led to the development of many numerical codes. However, many of them suffer from a lack of flexibility, which hinders the adaptation of the codes to new problems. Moreover, in many cases, changes can be done by a very reduced group...
Article
This work analyses the characterization of the hygric behaviour of a stone heritage material by solving the inverse problem using experimental data obtained from a water absorption by capillarity test (EN 15801). This common test is undemanding and requires relatively simple equipment as compared to other hygric characterization tests. For the solu...
Conference Paper
Full-text available
The proposed use of active clays for the isolation of radioactive wastes in deep geological repositories has been followed by a deeper understanding of this type of soils. This increased knowledge has led to the need for both conceptual and numerical models capable of capturing the main trends in behaviour and the different couplings between differ...
Conference Paper
Full-text available
Electrokinetic soil remediation (EKR) is one of the most promising techniques for decontamination of low permeability soils, in which the most classical techniques have been found to be less efficient. However, its practical application on a real scale has been rather limited since the phenomena involved in these processes are very complex. For thi...
Presentation
The study of the movement of solutes and their interaction with the solid phase of active clays is a problem of maximum interest in various geoenvironmental engineering applications, but especially in the deep geological disposal of spent nuclear fuel and other highly radioactive materials. The modelling of the physicochemical phenomena that determ...
Article
Full-text available
This paper presents a user-friendly tool—FLoW1D (One-Dimensional Water Flow)—for the estimation of parameters that characterize the unsaturated moisture transfer in porous building materials. FLoW1D has been developed in Visual Basic for Applications and implemented as a function of the well-known Microsoft Excel© spreadsheet application. The aim o...
Article
Electroosmotic permeability is a soil parameter that is fundamental for designing and implementing environmental remediation, dewatering, or soil stabilization processes. It presents a narrow range of variation compared to hydraulic permeability, so that in many occasions no experimental tests are carried out to determine it. Traditionally, the Hel...
Article
The good knowledge of the moisture transfer in materials used in the construction of architectonic cultural heritage is a key issue to define conservation and restoration actions. In recent years, numerical models are used in this field to improve the hygrothermal characterization of these materials. However, the structure of state functions involv...
Article
The use of electrokinetic Fenton (EK Fenton) process, as promising soil remediation approach, was investigated by using an iron electrode with different supporting electrolytes (tap water, H2O2, and citric acid) to depollute soil spiked with petroleum where kaolin was selected as low hydraulic conductivity. The results clearly confirm that, the com...
Article
This work presents a study of the dissolution-precipitation processes of calcite in soil undergoing electrokinetic remediation processes. For this purpose, a numerical inspection of one of these processes in a calcareous soil (10% calcite content) contaminated with an of the organochlorine acid herbicide (3,6-dichloro-2-pyridinecarboxylic acid) was...
Article
This work presents a techno-economic study of the scaling-up of the electrochemically-assisted soil remediation (EASR) process of polluted soil. Four scales have been selected for the study: laboratory, bench, pilot and prototype, with a capacity of treating a volume of soil of 1 × 10-4, 2 × 10-3, 0.11 and 21.76 m3, respectively. This study analyse...
Article
The erosion behaviour of bentonites is influenced by the ions concentration to which they are exposed, which could lead to link the erodibility of bentonite to salinity. However, changes in salinity produce further changes in bentonite hydration and swelling that are not always considered. The aim of this work is to apply a numerical model to inspe...
Article
In the treatment of a polluted soil, the pH has a strong impact on the development of different physicochemical processes as precipitation/dissolution, adsorption/desorption or ionic exchange. In addition, the pH determines the chemical speciation of the compounds present in the system and, consequently, it conditions the transport processes by whi...
Article
This article presents a numerical study of the transport phenomena involved in the electrokinetic remediation of soils polluted with polar pesticides. 2,4-Dichlorophenoxyacetic acid is used as a representative of this pesticide type. A one-dimensional configuration with two facing electrodes placed in electrolyte compartments and a cathodic overflo...
Article
Abstract This work evaluated water transport that occurs in a partially saturated soil of low hydraulic permeability when undergoing an electrokinetic remediation process. The soil used was a compacted kaolinite. To evaluate a wide range of possible conditions, soil with three different initial water contents (10, 15 and 20%) was used, obtaining a...
Article
In this work, accelerated degradation charge-discharge tests have been applied to compare the performance of a bench-scale vanadium redox flow battery (VRFB), when charged under galvanostatic conditions and under the highly variable conditions of current produced by wind turbines. Wind speed patterns applied for the VRFB charge were obtained during...
Article
An assessment of a bench-scale vanadium redox flow battery (VRFB) undergoing an accelerated ageing has been carried out under two operation modes: a galvanostatic-charging mode, where a constant current density was always applied, and solar-panel charging mode, where different current densities were applied according to the solar radiation profiles...
Article
Abstract A large scale electro-bioremediation test is carried out in a prototype composed by an electrokinetic soil remediation reactor with soil-treatment capacity of 32 m3. Soil polluted with a mixture of Oxyfluorfen undergoes a combined treatment in which the electrochemically assisted remediation produced by six electrodes placed in an hexagona...
Article
Models of electrokinetic soil remediation systems have been developed significantly in recent decades. A wide range of physicochemical phenomena occurs in this type of process, which makes it difficult to capture all of the system’s complexity in a model. Therefore, existing models do not attempt to simulate the behaviour of the entire geochemical...
Article
Full-text available
In this work, an accidental spill of Fluoxyl (commercial herbicide containing oxyfluorfen) is simulated in a pilot plant with a soil volume of 70 × 50 × 50 cm3. The transport of Fluoxyl obtained by the free diffusion of pollution and under the application of the electrokinetic fences (EKF) technology are compared in a 34-day treatment. In addition,...
Article
Full-text available
Abstract This study analyses the effect of the scale-up of electrokinetic remediation (EKR) processes in natural soils. A procedure is proposed to prepare soils based on a compacting process to obtaining soils with similar moisture content and density to those found in real soils in the field. The soil used here was from a region with a high agrari...
Article
Abstract This work reports the results of a study in which the remediation of soil that undergoes an accidental discharge of oxyfluorfen is carried out by using electrokinetic soil flushing (EKSF). Two different electrode configurations were tested, consisting of several electrodes surrounding an electrode of different polarity (so-called 1A6C, one...
Article
This work aimed to evaluate electrokinetic soil flushing (EKSF) technologies for the removal of 2,4-dichlorophenoxyacetic acid (2,4-D) from spiked soils using an electrode configuration consisting of one cathode surrounded by six anodes (1c6a) and one anode surrounded by 6 cathodes (1a6c). Experiments were conducted for over one month in a bench-sc...
Article
This study focuses on the evaluation of the electrokinetic soil flushing (EKSF) strategy to remediate soil following a simulated spill of the herbicide oxyfluorfen. EKSF is attained by placing (in the soil mockup) two rows of electrodes of different polarity facing each other. The results are compared with those obtained in a reference experiment i...
Article
Full-text available
This study focuses on evaluating the application of electrokinetic soil flushing (EKSF) technologies to remediate soil polluted with 2,4-dichlorophenoxyacetic acid (2,4-D). This compound was selected as an example of polar herbicides that may cause soil percolation and groundwater contamination due to its high water solubility, lifetime and mobilit...
Article
Abstract This work describes the application electrokinetic fence technology to a soil polluted with herbicides in a large prototype containing 32 m3 of soil. It compares performance in this large facility with results previously obtained in a pilot-scale mockup (175 L) and with results obtained in a lab-scale soil column (1 L), all of them operate...
Article
Abstract This work reports results of the application of electrokinetic fence technology in a 32 m3 -prototype which contains soil polluted with 2,4-D and oxyfluorfen, focusing on the evaluation of the mechanisms that describe the removal of these two herbicides and comparing results to those obtained in smaller plants: a pilot-scale mockup (175 L)...
Article
Full-text available
Electrokinetic processes provide the basis of a range of very interesting techniques for the remediation of polluted soils. These techniques consist of the application of a current field in the soil that develops different transport mechanisms capable of mobilizing several types of pollutants. However, the use of these techniques could generate non...
Article
Full-text available
Soils polluted with 2,4-D (model of ionic herbicide) can be remediated using a fence of alternating anodes and cathodes surrounding the main contamination point. This works reports results obtained in case study consisting of a 175 dm3 pilot plant, in which a soil polluted with an average concentration of 20 mg kg−1 of 2,4-D (spread by simulating a...
Article
Full-text available
In parabolic trough technology,the components used as solar receptor is formed by a steel tube confined inside a glass chamber.The space between both tubes is evacuated during the manufacturing process in current concepts.A new concept of absorber tube, currently under demonstration stage, HITECO, is based on the concept of dynamic vacuum, where th...
Article
In this work, the scale up of the flushing-fluid-assisted electrokinetic remediation of kaolin soil polluted with phenanthrene has been studied. Three different scales have been used: lab (25 cm(3)), bench (28 x 10(3) cm(3)) and pilot scale (175 x 10(3) cm(3)) plants. Results show that electrokinetic fluxes, removals of PHE and pollutant distributi...
Article
Full-text available
In this work, a pilot plant with two rows of three electrodes in semipermeable electrolyte wells was used to study the electrokinetic treatment of a natural soil polluted with phenanthrene (PHE). The electrokinetic pilot plant was an open system, i.e., there was direct contact between the soil and air. To increase the solubility of phenanthrene, th...
Thesis
La contaminación de suelos es un problema muy reciente del que no se ha tenido conocimiento hasta hace pocas décadas. Existe una gran diversidad de sucesos de contaminación de suelos y, como consecuencia, en los últimos años se han desarrollado una gran variedad de tecnologías aplicables a la remediación de los mismos y de las aguas subterráneas qu...
Article
The work described here concerns the electrochemical coagulation of effluents obtained in a surfactant-aided soil-remediation processes, in which phenanthrene was extracted from a clay soil using a sodium dodecyl sulphate solution as the solubilising fluid. The results show that the efficiency of the processes is largely influenced by the electrode...
Article
Polycyclic aromatic hydrocarbons (PAHs) persist in soils due to their low volatility, low water solubility and low biodegradability, all of which make it difficult to remove this type of compound from soils. The work described here involved the study of a combined surfactant-aided soil washing (SASW) process and coagulation treatment, using iron an...
Article
Full-text available
In recent years, electrokinetic techniques on a laboratory scale have been studied but few applications have been assessed at full-scale. In this work, a mock-up plant with two rows of three electrodes positioned in semipermeable electrolyte wells has been used to study the electro-osmotic flux distribution. Water accumulated in the cathodic wells...
Article
Full-text available
The mobility of four flushing fluids in an electro-remediation process has been studied. A mock-up plant with two rows of three electrodes positioned in semipermeable electrolyte wells was used in this study. Two different cases were considered: (i) an initial state when the soil was wet with water and the addition of surfactant starts and (ii) a s...
Article
Full-text available
Washing of soils polluted with polycyclic aromatic hydrocarbons (PAHs) using surfactant is a widely used technique. Once the pollutant is transferred to the washing solution, the polluted wastewater has to be treated. In this work, the feasibility of conductive-diamond electrochemical oxidation (CDEO) to treat wastewater polluted with phenanthrene...
Article
A high-temperature vapor-fed direct methanol fuel cell (DMFC) has been implemented using H3PO4-doped polybenzimidazole (PBI) as the electrolyte. The influence of the cell temperature, the methanol concentration, and the oxygen partial pressure has been studied. This investigation included the evaluation of the cell performance, each electrode poten...

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Projects

Project (1)
Project
Electrotech4pest focuses on the removal of pesticides from low permeability soil, groundwater and industrial wastewater (coming either from pesticides manufacturing, storage or handling) using electrochemical technology.