Miranda Carreño, Rubén

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First Name
Last Name
Miranda Carreño
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Ingeniería Química y de Materiales
Ingeniería Química
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Now showing 1 - 10 of 36
  • Publication
    Treatment of mature landfill leachate by electrocoagulation followed by Fenton or UVA-LED photo-Fenton processes
    (Elsevier, 2021-02-18) Tejera Tejo, Javier; Hermosilla Redondo, Daphne; Gascó, Antonio; Miranda Carreño, Rubén; Alonso, Víctor; Negro Álvarez, Carlos Manuel; Blanco Suárez, Ángeles
    The main objective of this study is to optimize a two-step treatment for mature landfill leachate consisting of electrocoagulation (EC) followed by Fenton or UVA-LED photo-Fenton processes aiming to provide a more efficient and feasible alternative treatment strategy that also increases biodegradability and decreases conductivity. Although 5 mA cm−2 EC is cheaper than 10 mA cm−2 EC per kg of removed COD (0.63 vs. 0.89 € kgCOD−1), it achieved the half total COD removal (13% compared to 26%), and the low residual iron concentration (100 mg L−1) that remained at the end of the process made necessary a long treatment time to perform the posterior Fenton (48 h) or UVA-LED photo-Fenton (6 h) process. When EC was performed at 10 mA cm−2, the residual iron concentration (220 mg L−1) was high enough to reduce treatment time by one half for both Fenton processes. Consequently, treatment cost decreases from 5.91 to 3.48 € kgCOD−1 for the EC + UVA-LED photo-Fenton ([H2O2]/COD = 1.063) treatment combination; whereas it slightly decreases from 1.68 to 1.61 € kgCOD−1 for the alternative EC + conventional Fenton combination. In both cases, total COD removal was around 87%. In addition, SUVA removal was >40%, conductivity was reduced about 20–30%, and biodegradability (BOD5/COD) increased over 0.3.
  • Publication
    Internal Treatment of Process Waters in Paper Production by Dissolved Air Flotation with Newly Developed Chemicals. 2. Field Trials
    (0888-5885, 2009) Miranda Carreño, Rubén; Negro Álvarez, Carlos Manuel; Blanco Suárez, Ángeles
    New chemicals, based on the synergistic effect between inorganic polyaluminium salts and organic cationic polyelectrolytes, have been tested previously at laboratory-scale, and the most efficient product has been selected for an industrial trial for a dissolved air flotation unit of a paper mill based on 100% recovered paper (part 1 of this work). A polyaluminium nitrate sulfate salt combined with a quaternary polyamine has been evaluated in a long-term industrial trial for assessing its potential benefits. Results indicate that this new chemical is able to improve the removal of contaminants by dissolved air flotation, especially when the contamination load of the waters is high, allowing a further closure of the water circuits.
  • Publication
    Silica removal with sparingly soluble magnesium compounds. Part I
    (Elsevier, 2014-12-10) Latour Romero, Isabel; Miranda Carreño, Rubén; Blanco Suárez, Ángeles
    The main bottleneck in the treatment and reuse of effluents from deinking paper mills that employ reverse osmosis (RO) is the high silica content, which causes membrane fouling that limits the recovery of the treatment. Silica removal with magnesium compounds enables to treat large volumes of water with high removal efficiencies at low cost. Although soluble magnesium compounds are efficient, their use is limited since they increase the conductivity in the treated waters. Therefore the use of sparingly soluble magnesium compounds might be a promising alternative. Three sparingly soluble magnesium compounds (MgO, Mg(OH)2 and (MgCO3)4•Mg(OH)2•5H2O) were studied in this paper at three pHs (10.5, 11.0 and 11.5) and five dosages (250-1500 mg/L) at ambient temperature (~20ºC). Only 40% silica removal was obtained, which is not high enough to work at regular RO recoveries without scaling problems. To increase silica removal, the slurries of sparingly soluble compounds were pre-acidified with concentrated sulphuric acid and tested at the same conditions. In this case, high removal rates were obtained (80-86%) at high pH (11.5), even at ambient temperature. These removal rates would allow working at 75-80% recovery in RO units without scaling problems. This pre-acidification, together with the use of Ca(OH)2 as pH regulator limited the increase of the conductivity of the treated waters to only 0.2 mS/cm. Additionally, the use of Ca(OH)2 instead of NaOH as pH regulator increased the chemical oxygen demand removal from 15% to 25%.
  • Publication
    Time Variations of Macrostickies and Extractable Stickies Concentrations in Deinking
    (American Chemical Society, 2010) MacNeil, Donald; Miranda Carreño, Rubén; Monte Lara, María Concepción; Blanco Suárez, Ángeles; Sundberg, Anna
    The stickies content, both macrostickies and stickies extractable in a solvent, was determined for samples taken at short time intervals from deinking lines, producing deinked pulp for newsprint production. The study was carried out at three mills on different continents, with each having a different source of recycled paper as raw material. The short-term variations in extractable stickies in the incoming raw material were quite extreme, with differences of 100% being seen within hours. Despite this, the final deinked pulp contained fewer sudden variations and had no correlation to the incoming stickies content. While the raw material appeared to affect the incoming stickies content, a well-optimized deinking line was able to buffer the raw material variability, and the final stickies content was more dependent on the deinking process. This result was seen for the two mills examined for this phenomenon, despite a different raw material supply. Macrostickies were found to exhibit the same tendencies, although with smaller and less sudden variations. However, the variations of macrostickies and extractable stickies never correlated, even when both were measured for the same pulp fraction, thus confirming that solvent extraction is not an appropriate method for the determination of macrostickies and is more a reflection of microstickies.
  • Publication
    Presentación del prototipo final a la Competición "Chem-E-Car" en el 10º Congreso Mundial de Ingeniería Química
    (2019-01-15) Negro Álvarez, Carlos Manuel; Monte Lara, M. Concepción; Fuente González, Elena de la; Blanco Suárez, M. Ángeles; Miranda Carreño, Rubén; Tijero Cruz, Antonio; Balea Martín, Ana; Merayo Cuevas, Noemí; Campano Tiedra, Cristina; López Expósito, Patricio Roberto; Plaza Rodríguez, Jesús; García-Ochoa Soria, Félix; Ladero Galán, Miguel; Senit Velasco, Juan José; Velasco Conde, Daniel; Pérez Trujillo, Francisco Javier; Alcalá Penadés, Germán; Mato Díaz, M. Sonia; Santos Barahona, Héctor; Lasanta Carrasco, M. Isabel; Miguel Gamo, M. Teresa de; García Martín, Gustavo; Illana Sánchez, Andrea; Bolívar Tejedo, Pilar; Carlucci, Maurizio Antonio; Morona Murillo, Lorena; Amo Salgado, Pablo del; Márquez Negro, Alejandro; Ara Jimeno, Pablo; Resino Guirao, Jesús; Alberola Sánchez, Raúl; Galán Galán, Alicia; Espinosa García, Lucía; Pedregal Sáez, Antonio; Fernández Rodríguez, Gemma; Arsuaga Cao, Pablo; Martín Jiménez, Diego; Arriba Gutiérrez, Héctor; Navarro Torres, Jorge; Sancho González, Luis
    El proyecto consistió en la presentación del prototipo Chem-E-Car desarrollado en la UCM en la competición mundial que se celebró durante el transcurso del Congreso Mundial de Ingeniería Química (Barcelona, 30 septiembre-2 de octubre de 2017).
  • Publication
    Environmental awareness and paper recycling
    (Editura Academiei Romane, 2010) Miranda Carreño, Rubén; Blanco Suárez, Ángeles
    The collection and utilization of recovered paper has increased over the past decades all over the world and this trend will continue. However, paper recycling is limited by the availability of resources, as well as by their recovery and quality. The paper describes how environmental awareness plays an important role in overcoming these limits. Firstly, the works carried out within the framework of COST Action E48 – “The limits of paper recycling” – are presented. These works have analysed the most important driving forces for extending the collection of recovered paper in Europe and established that environmental awareness is a key factor. Secondly, different initiatives for the development of environmental awareness and promotion of paper recycling – mainly based on information and educational campaigns, with special emphasis on child education – are presented.
  • Publication
    Efficiency of chitosans for the treatment of papermaking process water by dissolved air flotation
    (Elsevier, 2013-09) Miranda Carreño, Rubén; Nicu, Raluca; Latour Romero, Isabel; Lupei, Mihail; Bobu, Elena; Blanco Suárez, Ángeles
    Interest has grown in bio-polymers as being environmental friendly alternatives to synthetic additives. In this work, two native chitosans with different molecular weights have been evaluated on a laboratory scale for their effectiveness for the removal of contaminants from papermaking process waters by dissolved air flotation (DAF). The use of chitosan quaternary derivatives and the use of the native chitosans in combination with anionic bentonite microparticles have also been tested. Results demonstrate a high efficiency of the native chitosan products at intermediate dosages and furthermore, their efficiency is enhanced by the combined addition of bentonite. For an equivalent removal of contaminants, the required dosage of chitosan is about half that the dosage required in absence of bentonite. Quaternary derivatives have not improved the efficiency of the native chitosan in this case. The optimum treatment would be 50 mg/L of native chitosan and 100 mg/L of bentonite where this treatment is capable of the removal of 83- 89% turbidity (residual turbidity 210-320 NTU), 68-71% dissolved turbidity (residual dissolved turbidity of 22-24 NTU), 18-22% total solids (residual total solids of 2750-2900 mg/L) and 19-23% COD (1440-1525 mg/L). The low molecular weight native chitosan is more efficient than the medium molecular weight chitosan in all cases. The Focused Beam Reflectance Measurement (FBRM) is used to assess the aggregation process and to predict the separation efficiency of DAF units either with single or dual systems. The efficiency predicted through the FBRM technique is very similar to that obtained later in the DAF tests.
  • Publication
    Laboratorios Virtuales de Sistemas de Control de Procesos en Labview y en Matlab-Simulink
    (2016-04-06) Yustos Cuesta, Pedro; Guijarro Gil, M. Isabel; Santos Mazorra, Victoria Eugenia; Toledo Gabriel, José Manuel; Alonso Rubio, María Victoria; Dominguez Toribio, Juan Carlos; Oliet Pala, Mercedes; Diez Alcántara, Eduardo; Miranda Carreño, Rubén; Curto Maldonado, Andrés
    El objetivo general de este proyecto es desarrollar unas prácticas de laboratorio de control de procesos en un entorno virtual, que permita a los alumnos interaccionar con el mismo de manera activa y cercana a situaciones reales que se pueden encontrar en su vida laboral o profesional.
  • Publication
    Internal Treatment of Process Waters in Paper Production by Dissolved Air Flotation with Newly Developed Chemicals. 1. Laboratory Tests
    (American Chemical Society, 2009) Miranda Carreño, Rubén; Negro Álvarez, Carlos Manuel; Blanco Suárez, Ángeles
    New chemicals, based on the synergistic effect between inorganic polyaluminium salts and organic cationic polyelectrolytes, have been tested for the chemical optimization of a dissolved air flotation (DAF) unit, used as internal treatment of process waters in a paper mill based on 100% recovered paper. Laboratory tests have demonstrated that polyamine modifications of the aluminum salts are the most efficient in the removal of contaminants, the combination of a polyaluminium nitrate sulfate salt and a polyamine being the most efficient. This chemical has been studied under different conditions, such as different dosages or in combination with a flocculant for the treatment of waters from different paper grades production, and the results have demonstrated a good performance at laboratory scale. Therefore, a field trial has been recommended for assessing its potential benefits at mill scale, which will be described in a future paper.
  • Publication
    Treatment of a Mature Landfill Leachate: Comparison between Homogeneous and Heterogeneous Photo-Fenton with Different Pretreatments
    (MDPI, 2019-09-05) Tejera Tejo, Javier; Miranda Carreño, Rubén; Hermosilla, Daphne; Urra, Iñigo; Negro Álvarez, Carlos Manuel; Blanco Suárez, Ángeles
    This study focuses on the treatment of a mature landfill leachate by coagulation and photo-Fenton at different conditions. Optimal coagulation is carried out with ferric chloride in acid conditions; and with alum in near-neutral conditions, to minimize the use of sulphuric acid for pH adjustment (1 g/L vs. 7.2 g/L), the generation of sludge and the increase of conductivity in the final effluent. In both cases, a similar chemical oxygen demand (COD) removal is obtained, higher than 65%, which is high enough for a subsequent photo-Fenton treatment. However, the removal of absorbance at 254 nm (UV-254) was significantly higher with ferric chloride (83% vs. 55%), due to the important removal of humic acids at acid pH. The best results for coagulation are 2 g/L ferric chloride at initial pH = 5 and 5 g/L alum at initial pH = 7. After coagulation with ferric chloride, the final pH (2.8) is adequate for a homogeneous photo-Fenton using the remaining dissolved iron (250 mg/L). At these conditions, using a ratio H2O2/COD = 2.125 and 30 min contact time, the biodegradability increased from 0.03 to 0.51. On the other hand, the neutral pH after alum coagulation (6.7) allows the use of zero valent iron (ZVI) heterogeneous photo-Fenton. In this case, a final biodegradability of 0.32 was obtained, after 150 min, using the same H2O2/COD ratio. Both treatments achieved similar results, with a final COD, UV-254 and color removal greater than 90%. However, the economic assessment shows that the approach of ferric chloride + homogeneous photo-Fenton is much cheaper (6.4 €/m3 vs. 28.4 €/m3). Although the discharge limits are not achieved with the proposed combination of treatments, the significant increase of the pre-treated leachate biodegradability allows achieving the discharge limits after a conventional biological treatment such as sequencing batch reactor, which would slightly increase the total treatment cost.