Luis F. Vilches

Bio: Luis F. Vilches is an academic researcher from University of Seville. The author has contributed to research in topics: Fly ash & Leaching (metallurgy). The author has an hindex of 20, co-authored 58 publications receiving 1108 citations.

Review: recent advances in biogas purifying technologies

Abstract: Biomethane production through biogas upgrading is a promising renewable energy for some industries which could be part of the equilibrium needed with fossil fuels consumption to achieve a sustainab...

Remediation of acid mine drainage

Abstract: Acid mine drainage induced by the mining industry causes environmental and economic issues. Acid mine drainage contains mainly metals such as Fe, Al, Cu, Ca, Mg, Mn and Zn. Preventing the formation of acid mine drainage has not been found feasible. As a consequence, remediation treatments have been developed during the last years to remove metals and obtain high-quality water, which may be reused. We review here several treatment options such as selective metal precipitation, adsorption, electrochemical processes and membrane processes. Adsorption is the most employed commercially since it can recover 99% of the metals. Membrane processes are promising according to lab-scale results, notably because high-quality water is obtained. Further research is necessary to implement combination of technologies, e.g., adsorption membrane, at larger scales, as well as to obtain more valuable products that can balance the overall economy for the mining industry.

Biogas upgrading by cryogenic techniques

Abstract: The scarcity of fossil fuels and the worldwide pollution have led the scientific community to seek renewable energy alternatives. In particular, biogas has become a potential alternative fuel to be employed instead of traditional energies. Biogas is mainly composed by methane (CH4) and carbon dioxide (CO2). To obtain pure biomethane, a proper biogas upgrading to remove CO2 and other minority compounds is needed. For this purpose, upgrading processes have been developed, such as water or chemical scrubbing, membrane separation, pressure swing adsorption, and cryogenic techniques. Cryogenic techniques represent a good option to be optimized because these techniques yield high-purity products, ranging between 95 and 99%. Therefore, we present here a review on cryogenic techniques. In spite of many advantages, the high-energy penalty makes cryogenic techniques commercially inapplicable actually. Several authors have proposed novel configurations to reduce the energy consumption. Cryogenic packed-bed technology was recently tested in a coal-fired plant with an energy consumption of 1.8 MJ/kg CO2. Economic analyses were carried out for anti-sublimation CO2 capture, giving a cost of 34.5 €/ton CO2. Among the different alternatives of cryogenic hybrid systems, cryogenic membrane processes stand out due to a 54.4% of capital cost savings.

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Abstract: Photocatalytic water treatment using nanocrystalline titanium dioxide (NTO) is a well-known advanced oxidation process (AOP) for environmental remediation. With the in situ generation of electron-hole pairs upon irradiation with light, NTO can mineralize a wide range of organic compounds into harmless end products such as carbon dioxide, water, and inorganic ions. Photocatalytic degradation kinetics of pollutants by NTO is a topic of debate and the mostly reporting Langmuir-Hinshelwood kinetics must accompanied with proper experimental evidences. Different NTO morphologies or surface treatments on NTO can increase the photocatalytic efficiency in degradation reactions. Wisely designed photocatalytic reactors can decrease energy consumption or can avoid post-separation stages in photocatalytic water treatment processes. Doping NTO with metals or non-metals can reduce the band gap of the doped catalyst, enabling light absorption in the visible region. Coupling NTO photocatalysis with other water-treatment technologies can be more beneficial, especially in large-scale treatments. This review describes recent developments in the field of photocatalytic water treatment using NTO.

Analysis Synthesis And Design Of Chemical Processes

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