Papers by Miguel Sandoval
Electrochimica Acta, Oct 1, 2016
Computational fluid dynamics (CFD) simulations were carried out for single-phase flow in a pre-pi... more Computational fluid dynamics (CFD) simulations were carried out for single-phase flow in a pre-pilot filter press flow reactor with a stack of three cells. Velocity profiles and streamlines were obtained by solving the Reynolds-Averaged Navier-Stokes (RANS) equations with a standard k turbulence model. The flow behaviour shows the appearance of jet flow at the entrance to each cell. At lengths from 12 to 15 cm along the cells channels, a plug flow pattern is developed at all mean linear flow rates studied here, 1.2 ≤ u ≤ 2.1 cm s-1. The magnitude of the velocity profiles in each cell was different, due to the turbulence generated by the change of flow direction in the last fluid manifold. Residence time distribution (RTD) simulations indicated that the fluid behaviour tends towards a continuous mixing flow pattern, owing to flow at the output of each cell across the upper cell link pipe, which acts as a mixer. Close agreement between simulations and experimental RTD was obtained.
Environments
In addition to the numerous health effects caused by the COVID-19 pandemic, the scientific commun... more In addition to the numerous health effects caused by the COVID-19 pandemic, the scientific community has considered other emerging effects such as water-related impacts worthy of deep investigation. In this regard, the transmission cycles of the SARS-CoV-2 virus from fecal, vomiting, and sputum routes to sewage have led health authorities to diagnose, prevent, and use novel wastewater treatment technologies. Once they enter the gastrointestinal canal of a healthy person, viral particles can infect via the nominal amount of Angiotensin-Converting Enzyme 2 (ACE2) present in alimentary canal epithelial cell surfaces and further infect lung, heart, kidney, and other organs. The current review highlights the detection, status, and fate of SARS-CoV-2 from sewage treatment facilities to water bodies. Besides, it addresses the potential wastewater treatment processes to cope with various viruses, especially SARS-CoV-2. Many processes can manage contaminated wastewater and solid wastes over ...
Environmental and Health Management of Novel Coronavirus Disease (COVID-19 ), 2021
Reclamation of Forward Osmosis Reject Water Containing Hexavalent Chromium Via Coupled Electrochemical-Physical Processes
SSRN Electronic Journal, 2021
Journal of Scientific and Technical Applications, 2021
Objectives. Among strategies used to improve the photocatalytic properties of titanium dioxide (T... more Objectives. Among strategies used to improve the photocatalytic properties of titanium dioxide (TiO2), coupled semiconductor has been widely studied. Bismuth oxychloride (BiOCl) semiconductor has been highlighted, specially, with hierarchical structures (3D), because it has been shown to have higher performance in the photodegradation of organic dyes in wastewater. Therefore, in this work the degradation efficiency of acid orange 7 (AO7) was studied using TiO2 (P25 Degussa), synthesized BiOCl with hierarchical structure, and mixtures of them as photocatalysts. Methodology. BiOCl was synthesized by the solvothermal method. The BiOCl was characterized by different techniques such as X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, the pore distribution and the surface area were determined. Photocatalytic experiments were carried out with a photocatalyst dose of 1 g‧L-1, initial dye concentration of 50 mg‧L-1, and UV light illumination. Contribution. The int...
Separation and Purification Technology, 2021
International Journal of Electrochemical Science, Feb 1, 2017
Pathogens, 2021
Wastewater-based epidemiology (WBE) has a long history of identifying a variety of viruses from p... more Wastewater-based epidemiology (WBE) has a long history of identifying a variety of viruses from poliovirus to coronaviruses, including novel Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). The presence and detection of SARS-CoV-2 in human feces and its passage into the water bodies are significant public health challenges. Hence, the hot issue of WBE of SARS-CoV-2 in the coronavirus respiratory disease (COVID-19) pandemic is a matter of utmost importance (e.g., SARS-CoV-1). The present review discusses the background, state of the art, actual status, and prospects of WBE, as well as the detection and quantification protocols of SARS-CoV-2 in wastewater. The SARS-CoV-2 detection studies have been performed in different water matrixes such as influent and effluent of wastewater treatment plants, suburban pumping stations, hospital wastewater, and sewer networks around the globe except for Antarctica. The findings revealed that all WBE studies were in accordance with clin...
Water
Fluoride ions present in drinking water are beneficial to human health when at proper concentrati... more Fluoride ions present in drinking water are beneficial to human health when at proper concentration levels (0.5–1.5 mg L−1), but an excess intake of fluoride (>1.5 mg L−1) may pose several health problems. In this context, reducing high fluoride concentrations in water is a major worldwide challenge. The World Health Organization has recommended setting a permissible limit of 1.5 mg L−1. The application of electrocoagulation (EC) processes has received widespread and increasing attention as a promising treatment technology and a competitive treatment for fluoride control. EC technology has been favourably applied due to its economic effectiveness, environmental versatility, amenability of automation, and low sludge production. This review provides more detailed information on fluoride removal from water by the EC process, including operating parameters, removal mechanisms, energy consumption, and operating costs. Additionally, it also focuses attention on future trends related to...
This investigation is about fluoride removal from synthetic drinking water (10 mg L À1 F À in 0.5... more This investigation is about fluoride removal from synthetic drinking water (10 mg L À1 F À in 0.5 g L À1 Na 2 SO 4 and 1.5 mg L À1 ClO À at pH 7.7 and conductivity 410 lS cm À1), by electrocoagulation (EC) using aluminum as the sacrificial anode in a continuous filter press reactor coupled to a flocculator and clarifier (sludge settler). The influence of current density (j) and linear flow velocity in the EC reactor (u r) on the fluoride removal efficiency was analyzed. The EC tests that satisfy the WHO norm for fluoride (C F 6 1.5 mg L À1) were obtained at 0.91 6 u r 6 1.82 cm s À1 and 5 6 j 6 7 mA cm À2 , giving aluminum doses between 19.28 6 C Al(III) 6 52.67 mg L À1. Scanning Electron Microscopy (SEM), Energy Dispersive Analysis of X-rays (EDA-X) and Fourier Transform Infrared Spectroscopy (FTIR) analyses were performed to confirm the presence of fluoride in the flocs. The best EC tests in terms of energy consumption was obtained at 5 mA cm À2 , with a mean linear flow velocity in the EC reactor of 1.82 cm s À1 , which gives an energy consumption of 0.37 kW h m À3 , during the removal of fluoride from 10 to 1 mg L À1. EC at j > 7 mA cm À2 did not improve the EC process any further owing to massive generation of electrolytic gases which promote the breaking of the flocs.
In this paper we present detailed Euler-Euler Large Eddy Simulations (LES) of dispersed bubbly fl... more In this paper we present detailed Euler-Euler Large Eddy Simulations (LES) of dispersed bubbly flow in a rectangular bubble column. The motivation of this study is to investigate the potential of this approach for the prediction of bubbly flows, in terms of mean quantities. The physical models describing the momentum exchange between the phases including drag, lift and wall force were chosen according to previous experiences of the authors. Experimental data, Euler-Lagrange LES and unsteady Euler-Euler Reynolds-Averaged Navier-Stokes results are used for comparison. It is found that the present model combination provides good agreement with experimental data for the mean flow and liquid velocity fluctuations. The energy spectrum obtained from the resolved velocity of the Euler-Euler LES is presented as well.
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Papers by Miguel Sandoval