M.M. Ballesteros Martín

Pablo de Olavide University | UPO · Department of Molecular Biology and Biochemistry Engineering

Posidonia oceánica es una de las plantas más abundantes en el mar Mediterráneo; su presencia y crecimiento se encuentra fundamentalmente a cuarenta metros de profundidad. Las células epidérmicas de la pared contienen celulosa, hemicelulosa y pectina, pero no lignina, aunque este biopolímero se encuentra en baja proporción en las hojas y en mayor pr...

Los cambios que han surgido en la era de la información, han originado que las universidades intervengan en la resolución de problemas económicos, sociales y culturales; es por ello que quienes se desenvuelven en estos medios deben proporcionar respuestas a la consolidación del encuentro universidad-sociedad (Guevara, 2006). Teniendo en cuenta que...

Cada vez con más frecuencia los alumnos universitarios acuden a las áreas de empleo y emprendimiento de sus universidades para obtener recursos de cara a su inserción laboral. Una de las principales dificultades que encuentran, es la preparación para las entrevistas de trabajo a las que se tendrán que enfrentar una vez que quieran acceder al mercad...

Reutilización de los residuos de marea para diversas aplicaciones industriales

Cationization, cellulose, kinetics, lignocellulosics, fibers

Amorphization, Cellulose, Kraft pulp fibers, Crystallinity index

Cellulose can be subjected to chemical treatments in order to change its charges. Cellulosic fibers normally carry a negative charge when suspended in water due to the presence of ionizable carboxyl groups. Changing the fibers from anionic to cationic has as objective to improve the electrostatic interaction with other fibers, fines and fillers. Th...

Zostera noltii as an alternative source of cellulose. This use will give value to a marine waste that usually ends up in municipal landfills and will reduce the use of traditional wood raw materials. With this purpose, an extraction method respectful with the environment based on the treatment with soda and hydrogen peroxide was investigated. The l...

Advanced oxidation technologies for wastewater treatment have been recognized as promising solutions for disinfection. Among them, solar photo-Fenton at near neutral pH is being proposed as alternative disinfecting technology. This study analyses the role of two solar energy parameters, solar UVA irradiance (intensity in terms of W m−2) and accumul...

Each year there are accumulations of tonnes of tidal wastes on the beaches all around the spanish geography. These tidal wastes need to be removed and treated in to order to avoid a negative environmental and economic related tourist impact on the coastal zones. Typically these residues are formed by marine plants such as Posidonia oceanica or alga...

Papermaking has been using high quantities of retention agents, mainly cationic substances and organic compounds such as polyamines. The addition of these agents is related to economic and environmental issues, increasing contamination of the effluents. The aim of this work is to develop a cationic polymer for papermaking purposes based on the util...

Papermaking has been using high quantities of retention agents, mainly cationic substances and organic compounds such as polyamines. The addition of these agents is related to economic and environmental issues, increasing contamination of the effluents. The aim of this work is to develop a cationic polymer for papermaking purposes based on the util...

Uso del programa Berkeley Madonna para el desarrollo de modelos en la docencia en Ingeniería Química Resumen La modelización es un procedimiento metodológico fundamental para resolver problemas en ingeniería. Consiste en representar el problema de una manera adecuada, de tal forma que se consiga una sustitución del sistema real por uno más adecuado...

The revalorization of agricultural wastes is attracting the attention of researchers and manufacturers. One of the many ways to carry out this revalorization is the pulping and bleaching of those residues for papermaking. Spain annually produces more than 300 thousand tonnes of Citrus sinensis (orange tree) trimmings. If they are not re-used, they...

This study analyses the use of the solar photo-Fenton treatment in compound parabolic collector photo-reactors at neutral pH for the inactivation of wild enteric Escherichia coli and total coliform present in secondary effluents of a municipal wastewater treatment plant (SEWWTP). Control experiments were carried out to find out the individual effec...

Uso de programas de simulación para promover la pedagogía activa en la docencia universitaria. Using simulation software to implement an active learning methodology in the university teaching. RESUMEN. La pedagogía activa se fundamenta en que el alumno sea un sujeto activo en su propio aprendizaje y el docente actúe como un facilitador del proceso....

The competitive effect for the oxidative species produced during solar photo-Fenton process at neutral pH between an organic compound (resorcinol) and a model microorganism (Enterococcus faecalis) was investigated. With this purpose, the inactivation of E. faecalis was evaluated under several solar processes, i.e. SODIS, solar-UVA with H2O2 (10, 20...

A new bioassay proposed in the patent P201300029 was applied to a pre-treated wastewater containing a mixture of commercial pesticides to simulate a recalcitrant industrial wastewater in order to determine its biodegradability. The test uses a mixture of standardized inoculum of the lyophilized bacteria Pseudomonas putida with the proper proportion...

The photo-Fenton process is a promising alternative to classical water disinfection treatments, although information in this regard is scarce due to its operational limitations. The effect of temperature (10, 20, 30 and 40 °C) was studied on water disinfection using the photo-Fenton reaction at initial near neutral pH with resorcinol as a model of...

A photo-Fenton-membrane bioreactor (MBR) coupled system is an innovative tool for the treatment of wastewater containing high quantities of contaminants. In this paper, wastewater with 200 mg l(-1) of dissolved organic carbon (DOC) of a selected mixture of five commercial pesticides: Vydate®, Metomur®, Couraze®, Ditimur-40®, and Scala® was treated...

The use of the solar photo-Fenton process is proposed to degrade Paracetamol in water in order to form biodegradable reaction intermediates which can be finally removed with a downstream biological treatment. Firstly, biodegradability enhancement with photo-Fenton treatment time has been evaluated; the minimum mineralization level should be at leas...

Four biodegradability tests (Pseudomonas putida bioassay, Zahn-Wellens test, BOD5/COD ratio and respirometry assay) have been used to determine the biodegradability enhancement during the treatment of wastewater containing 200 mg L(-1) of dissolved organic carbon (DOC) of a five commercial pesticides mixture (Vydate, Metomur, Couraze, Ditumur and S...

Wastewater containing recalcitrant contaminants as pesticides can be treated by a coupled system which consists of a solar photo-Fenton pretreatment followed by a biological oxidation process. Membrane bioreactor technology (MBR) is particularly suitable for advanced biological treatment of wastewater containing biorecalcitrant compounds and shows...

The influence of pesticide concentration, expressed as dissolved organic carbon (DOC), on combined solar photo-Fenton and biological oxidation treatment was studied using wastewater containing a mixture of five commercial pesticides, Vydate, Metomur, Couraze, Ditumur and Scala. Two initial DOC concentrations, 200 mg L(-1) and 500 mg L(-1) were assa...

Experiments based on Vibrio fischeri, activated sludge and Pseudomonas putida have been employed to check variation in the biocompatibility of an aqueous solution of a commercial pesticide, along solar photo-oxidative process (TiO(2) and Fenton reagent). Activated sludge-based experiments have demonstrated a complete detoxification of the solution,...

Complete degradation of a pesticide mixture by a combination of a photo-Fenton pretreatment and an activated-sludge batch reactor is demonstrated. Four commercial pesticides, Laition, Metasystox, Sevnol and Ultracid were chosen for this experiment. The active ingredients are, respectively, dimethoate, oxydemeton-methyl, carbaryl and methidathion. T...

Biodegradability of aqueous solutions of the herbicide alachlor and the fungicide pyrimethanil, partly treated by photo-Fenton, and the effect of photoreaction intermediates on growth and DOC removal kinetics of the bacteria Pseudomonas putida CECT 324 are demonstrated. Toxicity of 30-120 mg L(-1) alachlor and pyrimethanil has been assayed in P. pu...

Bacterial growth on mixed substrates is employed for wastewater treatment. Biodegradation kinetics of Pseudomonas putida CECT 324 growth on formic acid, vanillin, phenol and oxalic acid mixtures is described. The experiments were carried out in a stirred-tank fermentor in batch mode at different temperatures (25, 30 and 35 degrees C) and pH (5, 6 a...

Biodegradability of a partially photo-oxidized pesticide mixture is demonstrated and the effect of photo-Fenton treatment time on growth and substrate consumption of the bacteria Pseudomonas putida CECT 324 is shown. Four commercial pesticides, laition, metasystox, sevnol and ultracid, usually employed in citric orchards in eastern Spain, were chos...

A new approach is proposed for the simultaneous determination of the volumetric oxygen transfer coefficient (KLa) and the oxygen uptake rate (OUR) in bioreactors. The methodology is based on modifications of the classical dynamic gassing-in method and the steady-state mass balance method for obtaining the values KLa and OUR, respectively. A polarog...

Pilot plant experiments applying solar titanium dioxide photocatalysis and solar photo-Fenton treatment at different pH and iron concentrations with an initial diclofenac concentration of 50 mg L−1 are described.In preliminary experiments absence of hydrolysis and slow photolysis under solar irradiation of diclofenac solutions were observed. Solar...

Several different pesticides (alachlor, atrazine, chlorfenvinphos, diuron, isoproturon and pentachlorophenol) considered PS (priority substances) by the European Commission and dissolved in water at 50 mg/L (or at maximum water solubility) have been degraded at pilot-plant scale using photo-Fenton and TiO2 photocatalysis driven by solar energy. Two...