Judith Sarasa
University of Zaragoza
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Featured researches published by Judith Sarasa.
Water Research | 1998
Judith Sarasa; M.P Roche; M.P Ormad; E. Gimeno; A Puig; J.L. Ovelleiro
The degradation of the compounds present in a previously chlorinated wastewater resulting from the production of azoic dyes has been studied in this project. Towards this end, the first step developed was the characterization of the spillage water by GC/MS and GC/FID. Secondly, a combined ozone+Ca(OH)2 treatment was carried out, determining its efficiency on this wastewater. The majority of compounds found in the wastewater are aniline derivatives and azo compounds. Also, as a result of the chlorination treatment which is carried out by the factory, some organochloride compounds were identified, being the most important those which are subjected to legislative control, namely: chloroanilines, chloronitrobenzenes and chlorophenols. After ozonation, the concentration of the compounds present is reduced to good percentages. The by-products formed after this first treatment were, mainly, nitrobenzene derivatives and organic acid compounds. The following treatment with Ca(OH)2 leads to almost total elimination of the remaining compounds in the ozone treatment. However, aniline and chloroanilines are formed after chemical coagulation due to the strong basic medium at which the sample in this process is set. C.O.D. is reduced 25% after ozonation, while it decreased 50% after the complete treatment. T.O.C. remained constant during ozonation, but a 42% reduction was obtained after chemical coagulation. Color decreased gradually during ozonation reaction, and after the final treatment the reduction was 62%. The complete process of ozonation and chemical coagulation with Ca(OH)2 is, in general, very effective to treat this kind of wastewaters.
Water Research | 2000
R. Gracia; S. Cortés; Judith Sarasa; P. Ormad; J.L. Ovelleiro
Abstract This paper presents the results obtained with heterogeneous catalytic ozonation in which raw Ebro river (Spain) water is ozonated in the presence of titanium dioxide supported on alumina as a solid catalyst at two different O 3 :C weight basis ratios. The influence of catalytic ozonation on the trihalomethane (THM) formation during drinking-water treatment is also studied. It is shown that using this catalyst during ozonation of the natural water allowed reductions in THM formation. Characterization of the raw, ozonated and chlorinated water was made by concentrating the sample through liquid–liquid extraction, along with the gas chromatography/mass spectrometry (GC/MS). A total of 66 different organic compounds were identified, mainly carboxylic acids, aromatics, aldehydes, ketones and alcohols. The percentage of elimination or formation levels reached during ozonation and chlorination are discussed.
Water Research | 2002
Judith Sarasa; Susana Cortés; P. Ormad; Raquel Gracia; J.L. Ovelleiro
Aqueous solutions of aniline and p-chloroaniline were treated with ozone in order to study the reaction and oxidation by-products. Aniline solutions were ozonated at low and high pH, so as to compare both molecular and hydroxyl free radical mechanisms, respectively. The main identified aromatic by-products were nitrobenzene and azobenzene when the experiment was carried out at acid pH. Formation of nitrobenzene, azobenzene, azoxybenzene and 2-pyridine-carboxylic was observed when the ozonation was carried out at basic pH. p-Chloroaniline was treated with ozone only at high pH and the identified by-products were in accordance with those obtained in the ozonation of aniline: p-chloronitrobenzene, 4,4-dichloroazobenzene and 4-chloro-2-pyridine-carboxylic acid. All the aromatic by-products found were less toxic than the raw materials. The pseudo-first-order constants in aniline concentration were calculated, whilst kinetic in p-chloroaniline concentration could not be adjusted to a first-order reaction.
Ozone-science & Engineering | 2000
R. Gracia; S. Cortés; Judith Sarasa; P. Ormad; J.L. Ovelleiro
Abstract This paper presents the results obtained with heterogeneous catalytic ozonation in which model and natural waters are ozonated in the presence of supported titanium dioxide (TiC2) as a solid catalyst. The conditions in preparing the supported catalyst are experimentally optimized. The efficiencies of three catalyst supports (attapulgyte, alumina and silica gel) for organic matter oxidation have been compared. The TiC2 supported in alumina calcined at 500[ddot]C compacted to granular form with a particle diameter about 2-4 mm is demonstrated to be the best catalyst on the removal total organic carbon (TOC) by ozone.
Ozone-science & Engineering | 2000
S. Cortés; Judith Sarasa; P. Ormad; R. Gracia; J.L. Ovelleiro
Abstract The objective of this study was to investigate the use of advanced oxidation processes to oxidize an industrial wastewater in which chlorobenzenes were found in the range of 1 mg/L to 5 mg/L and a solution of chlorobenzenes whose concentration was 0.03 mg/L, which was prepared from stock solutions. Ozone in a neutral medium (pH=7) was compared with ozone in presence of metallic ions, such as Fe (II), Fe(III) and Mn(II) at concentration of 610-5 M.
Journal of Chromatography A | 1996
A. Puig; P. Ormad; Judith Sarasa; E. Gimeno; J.L. Ovelleiro
The content of wastewater resulting from the manufacture of rubber antioxidants and accelerators by a factory situated in the Ebro basin (Spain) has been determined using gas chromatography-mass spectrometry (GC-MS) and gas chromatography-flame ionization detection (GC-FID). The change in the pollutants was studied in the riverbed via two modules which continuously gathered pollutants on various solid supports (activated carbon and XAD-2 resins). These modules were located in Bocal Station, lying a further 100 km downstream from the factory, and from the Zaragoza water supply. Forty-six different compounds were identified at Bocal Station, the majority resulting from the production of rubber additives. Due to the immunity of different waste substances, and to the toxic nature of some, we studied their reaction when subjected to techniques of chemical oxidation using ozone.
Bioresource Technology | 2009
Judith Sarasa; Jose M. Gracia; Carlos Javierre
The aim of this work was to study the biodisintegration degree of different pieces made of a biodegradable thermoplastic material, the polylactic acid (PLA) with and without corn in its composition, is studied. The pieces of different shapes and thicknesses were obtained by both injection and extrusion processes, where also a specific foaming additive of polystyrene was added. The PLA and PLA-corn manufactured pieces were subjected to aerobic degradation at a constant temperature of 58+/-2 degrees C for 90 days, following EN 14806 and ISO 20200:2004 Norms. It was found that the pieces made of PLA and PLA with foaming agent had an average biodisintegration degree of 63.6%. With regard to the pieces made of PLA-corn, an average biodisintegration degree of 79.7% was obtained. In this case, the percentage of non degraded material was independent of the size, shape and thickness of the original pieces.
Ozone-science & Engineering | 2000
R. Gracia; S. Cortés; Judith Sarasa; P. Ormad; J.L. Ovelleiro
Abstract This paper presents the results obtained with heterogeneous catalytic ozonation in which model and natural waters are ozonated in the presence of titanium dioxide (TiO2) supported on alumina. In this work the stability of the catalyst is investigated. Four consecutive ozonations with the same catalyst revealed no reduction in the organic matter oxidation. The results obtained in natural waters with catalysts that had been previously used indicated that the applied catalysts did not appear to lose any of their efficiency after use.
Journal of Chromatography A | 1996
P. Ormad; S. Cortés; Judith Sarasa; A. Martín; A. Puig; J.L. Ovelleiro
The results obtained in the characterization of the micropollutants in the River Cinca by adsorption on granular activated carbon (GAC) and liquid-liquid (LL) extraction are presented. Gas chromatography-mass spectrometry was used for the identification of the various components in the water. Nineteen organochloride compounds [the complete series of chlorobenzenes, DDTs and their metabolites, dichlorobenzophenone (DCBF) and tetradifon] were quantified by gas chromatography-electron-capture detection. In the River Cinca, 229 and 74 compounds were identified by GAC and LL extraction, respectively, fifteen of which appear in the group of substances in List I of the 76/464/EEC European Council Directive as Priority Pollutants.
Ozone-science & Engineering | 2005
C. Consejo; María P. Ormad; Judith Sarasa; J.L. Ovelleiro
The process of car body painting is one of the manufacturing processes that may involve the use of organic solvents for surface treatments. As a result of this process, wastewaters containing raw materials and auxiliary products used during the cleaning step are produced. The main objective of this study is to find an appropriate purification technique to eliminate or reduce the contamination present in this kind of wastewater. Different treatments were investigated: ozonation, ozonation combined with hydrogen peroxide, photo-Fenton treatment, and coagulation- flocculation.