Alberto Gonzalo

@article{Marin2009,

title = {Semichemical pulping of Miscanthus giganteus. Effect of pulping conditions on some pulp and paper properties},

author = {Fernando Marín and José Luis Sánchez and Jesús Arauzo and R Fuertes and Alberto Gonzalo},

doi = {10.1016/j.biortech.2009.03.011},

issn = {09608524},

year  = {2009},

date = {2009-09-01},

journal = {Bioresource Technology},

volume = {100},

number = {17},

pages = {3933--3940},

publisher = {Elsevier},

abstract = {Miscanthus is an interesting raw material for pulp production, it is a high yield low maintenance plant with a high cellulose and hemicellulose content. Its semichemical pulp can be beneficial in paper for cardboard production process, which nowadays is usually made from secondary fibers, by increasing the mechanical properties of the paper produced. In this study, the influence of the percentage of NaOH used related to the dry Miscanthus weight, digestion time and refining time on some pulp and paper properties have been studied and compared with pulp obtained from commercial fluting paper (CF). Fiber size distribution of the Miscanthus pulp was found to contain a higher fines (less than 0.2 mm) percentage than the CF pulp. Hand-sheets made from Miscanthus pulp showed better mechanical properties than the ones made with the CF pulp. CMT, RCT and CCT indexes were higher when using 100% Miscanthus pulp or mixtures of Miscanthus and CF pulp. The only property which worsened was Gurley porosity. Of the three operational variables changed, refining time exerts the most significant influence on the pulp and paper properties measured. textcopyright 2009 Elsevier Ltd. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Abrego2009,

title = {Structural changes of sewage sludge char during fixed-bed pyrolysis},

author = {Javier Ábrego and Jesús Arauzo and José Luis Sánchez and Alberto Gonzalo and Tomás Cordero and José Rodríguez-Mirasol},

url = {https://pubs.acs.org/sharingguidelines},

doi = {10.1021/ie801366t},

issn = {08885885},

year  = {2009},

date = {2009-03-01},

journal = {Industrial and Engineering Chemistry Research},

volume = {48},

number = {6},

pages = {3211--3221},

publisher = {American Chemical Society},

abstract = {Undigested dried sewage sludge from a wastewater treatment plant was pyrolyzed at temperatures between 300 and 900 °C, with an additional hold time at the highest temperature. A fixed-bed reactor was used with a heating rate of 20 °C/min under an atmosphere of nitrogen. Pyrolysis product distribution, FTIR, XRD, BET, SEM, and ultimate and proximate analyses were used to gain a better understanding of the structural changes occurring during pyrolysis. At low to medium pyrolysis temperatures, major mass loss occurs, and most of the gaseous and liquid products are released with little porous development, whereas at temperatures between 700 and 900 °C, structural changes seem to be triggered by calcium carbonate decomposition. This leads to a second stage of gas evolution, as CaO promotes gasification of the char in the presence of iron sulfides. The subsequent release of CO runs parallel with an increase in the BET surface area. In addition, the aromatic character of the char increases with temperature, and nanotube-like tubular structures can be detected by SEM. textcopyright 2009 American Chemical Society.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Casajus2009,

title = {Product distribution and kinetic scheme for the fixed bed thermal decomposition of sewage sludge},

author = {C Casajus and Javier Ábrego and Frederic Marias and J Vaxelaire and José Luis Sánchez and Alberto Gonzalo},

doi = {10.1016/j.cej.2008.08.033},

issn = {13858947},

year  = {2009},

date = {2009-01-01},

journal = {Chemical Engineering Journal},

volume = {145},

number = {3},

pages = {412--419},

publisher = {Elsevier},

abstract = {In this paper, a new kinetic model for the thermal decomposition of dry sewage sludge was determined. In order to achieve this main objective, various experiments were carried out to collect enough information for the estimation of the different numerical parameters of the model. These experiments include both results from a fixed bed pyrolysis installation and a thermogravimetric analysis device. The experiments allowed for the detailed monitoring of the dynamical evolution of the mass of the sample under investigation, together with the cumulative amounts of tars and permanent gases produced during thermal decomposition of sewage sludge at low heating rates (5-20 °C/min). Solid mass loss during the pyrolysis shows two regions, between 150 °C and 600 °C, where most of the tar is depleted from the solid and non-condensible gases are formed, and a second one between 600 °C and 900 °C where mainly only non-condensible gases are produced. The solid fraction accounted for about 50% of the initial weight, tar around 30% and gases the remaining 20%. Regarding the formation of non-condensible gases from low temperature, a new kinetic scheme was proposed involving an initial decomposition step of the sludge yielding tar and gases as gas phase products and a solid intermediate compound which decomposes at higher temperatures, giving the char fraction and more non-condensible gases. The comparison between the numerical prediction and the experimental results was excellent. textcopyright 2008 Elsevier B.V. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Aguiar2008,

title = {Influence of temperature and particle size on the fixed bed pyrolysis of orange peel residues},

author = {Leonardo Aguiar and F Márquez-Montesinos and Alberto Gonzalo and José Luis Sánchez and Jesús Arauzo},

doi = {10.1016/j.jaap.2008.06.009},

issn = {01652370},

year  = {2008},

date = {2008-09-01},

journal = {Journal of Analytical and Applied Pyrolysis},

volume = {83},

number = {1},

pages = {124--130},

publisher = {Elsevier},

abstract = {Orange peel is a residue from the production of juice. Its energetic valorisation could be interesting in areas where a different use, such as animal feed, is not possible. In order to investigate the viability of energy recovery, the pyrolysis of orange peel residues was studied in a fixed bed reactor, as an initial assessment of this process. The influence of pyrolysis temperature (300-600 °C) and particle size (dp < 300 $mu$m and dp > 800 $mu$m) on product distribution, gas composition and char heating value has been investigated using a factorial design of experiments. Gas, char and water are the main products obtained; tar is only about 6 wt.% of the initial residue. Temperature was found to be the parameter which exerts a more important influence on the results than particle size. textcopyright 2008 Elsevier B.V. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Manya2006b,

title = {Influence of gas residence time and air ratio on the air gasification of dried sewage sludge in a bubbling fluidised bed},

author = {Joan Josep Manyà and José Luis Sánchez and Javier Ábrego and Alberto Gonzalo and Jesús Arauzo},

doi = {10.1016/j.fuel.2006.04.008},

issn = {00162361},

year  = {2006},

date = {2006-10-01},

journal = {Fuel},

volume = {85},

number = {14-15},

pages = {2027--2033},

publisher = {Elsevier},

abstract = {Because little information is available about sewage sludge gasification in a bubbling fluidised bed (BFB), further experiments are required to quantify the power generation potential of dried sewage sludge (DSS) as well as to evaluate the optimum conditions for its gasification. In this work, the influence of the bed height on the process was experimentally determined using a laboratory-scale BFB reactor. The gasification tests were performed at different values of equivalence ratio ($łambda$) and at two values of constant bed height (150 and 300 mm). Attention was focused on the effect of increasing bed height on the gas composition, average cold gas efficiency, and product distribution. Results obtained in this study show that a bed height increase improves the efficiency of the DSS gasification process. This fact could be explained because the high ash content of DSS represents an obstacle to the gas diffusion. textcopyright 2006 Elsevier Ltd. All rights reserved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}