60f Dosta Parras, Joan [WorldCat Identities]
WorldCat Identities

Dosta Parras, Joan

Overview
Works: 10 works in 15 publications in 3 languages and 15 library holdings
Roles: Author
Publication Timeline
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Most widely held works by Joan Dosta Parras
Strategies to improve anaerobic digestion of wastes with especial attention to lignocellulosic substrates by Xavier Fonoll Almansa( Book )

2 editions published in 2016 in English and held by 2 WorldCat member libraries worldwide

The energy demand increase and the generation of wastes is being the major problem regarding the next generation sustainability. Both problems can be corrected through the implementation of anaerobic digestion, a waste treatment technology able to produce electricity, heat and a fertilizer. The anaerobic co-digestion between two wastes with complementary characteristics has been widely studied to improve the methane production in anaerobic digesters. However, to increase the methane production from lignocelulosics substrates is still one of the main challenges of anaerobic digestion. Lignocelulosic components are a tridimensional structure between lignin, hemicellulose and cellulose, which bonds are extremely difficult to degrade by conventional anaerobic bacteria. Besides, those components can be found in a wide range of substrates such as municipal solid wastes, agro-wastes and energy crops. In the following thesis, the increase of the economic viability of anaerobic digestion plants treating lignocelulosic materials has been studied. Initially, the transitory state while the co-substrate was changed in the anaerobic co-digestion between sewage sludge and fruit waste was studied. The stability of the reactors was not drastically affected when the co-substrate was changed, but, the use of a co-substrate with a high concentration of fibers did not improve the methane production too much. Secondly, in order to consider the valorization of lignocellulosic components through the production of by-products, the effect of these components on the municipal solid wastes anaerobic digestion performance was evaluated. When the paper waste was removed, the biodegradability of the feedstock increased allowing the specific methane production to increase. Nevertheless, the digester was more fragile against instabilities and the digestate quality decreased if short retention times are applied. Next, low-temperature and ultrasounds pretreatments, strategies that have not been used too much for the degradation of lignocellulosic components, were studied to increase the methane production during the anaerobic co-digestion of barley waste and pig manure. Low-temperature and ultrasound pretreatment increased the methane production in a 27 and 12% respectively but only the first one had a positive energy balance. Finally, rumen, a waste from the slaughterhouse industry was used as inoculum and as co-substrate to bring hydrolytic bacteria able to improve the degradation of Napier grass. The results showed that, when rumen is used as inoculum it need to be mixed with an inoculum with high buffer capacity and a co-substrate with alkalinity need to be used to avoid long start-up periods. The methane production only increased at the beginning and in a long-term, the microbial community was governed by the substrate and not by the rumen. However, rumen did not increase the methane production when it was used as a co-substrate because the digester conditions were not optimal for the activity of hydrolytic bacteria. All the experiments were carried out in the laboratory and the conclusions are considered a progress for the energy production through the use of lignocellulosic substrates
Estudi d'alternatives d'eliminació biològica de nitrogen dels corrents de retorn a capçalera en plantes de tractament d'aigües residuals urbanes : simulació i elecció de la millor tecnologia disponible by Clara Gaya Casamitjana( Book )

2 editions published between 2010 and 2011 in Catalan and held by 2 WorldCat member libraries worldwide

Les plantes de tractament d'aigües residuals han estat tradicionalment dissenyades per a l'eliminació de la matèria orgànica, però la legislació vigent és cada vegada més estricta amb l'abocament al medi dels compostos nitrogenats. En aquestes plantes de tractament es produeixen uns corrents, procedents de la línia de fangs, que de forma generalitzada són reconduïts a la capçalera de planta. Aquests corrents de retorn acostumen a ser rics en amoni, sobretot en els casos que procedeixen d'una etapa prèvia de digestió anaeròbia. Per tant, la tendència actual és la de buscar noves tecnologies per tal d'aplicar un tractament específic sobre aquests corrents. El present treball s'ha centrat en l'estudi de noves tecnologies que permeten optimitzar el procés de depuració. D'una banda, el procés Anammox (ANaerobic AMMonium OXidation), el qual constitueix una alternativa al procés convencional de nitrificació-desnitrificació a l'hora de tractar corrents rics en amoni. Per tal de dur a terme aquest procés cal combinar-lo amb una etapa prèvia de nitritació parcial. Així, la combinació de la nitritació parcial-Anammox pot tenir lloc en dos reactors (procés SHARON-Anammox) o en un únic reactor (procés CANON). D'altra banda, s'ha estudiat també el procés de bioaugmentació BABE (Bio-Augmentation Batch Enhanced), el qual permet augmentar la capacitat nitrificant de la planta. Per tal de poder estudiar l'efecte de la introducció d'aquests processos sobre l'efluent d'una planta de tractament, s'han seleccionat dues depuradores amb característiques ben diferenciades. D'una banda, l'estació depuradora d'aigües residuals (EDAR) del Prat, on es realitza un procés de nitrificació-desnitrificació a la línia principal i un tractament de digestió anaeròbia a la línia de fangs, i d'altra banda, l'EDAR del Besòs, la qual no disposa d'un tractament d'eliminació de nutrients a la línia d'aigües i els fangs no són sotmesos a un procés de digestió anaeròbia. A partir de la simulació amb el programa BIOWIN#xF8EA; dels processos actuals que tenen lloc a ambdues plantes, s'han pogut caracteritzar els corrents de retorn procedents de la línia de fangs, i posteriorment s'han introduït les diferents tecnologies en cada procés. Els resultats obtinguts per a l'EDAR del Prat mostren una lleugera millora en l'abocament de compostos nitrogenats, sent el procés BABE el que presenta una reducció més elevada. Concretament, la concentració de nitrogen total a l'efluent de la planta en el cas actual i després d'introduir els processos SHARON-Anammox i BABE és de 13,9 mg N/l, 12,9 mg N/l i 11,4 mg N/l respectivament, superant el límit establert per la normativa de 10 mg N/l. A l'EDAR del Besòs, en canvi, la introducció del procés SHARON-Anammox ha comportat un pitjor rendiment en l'eliminació del nitrogen total respecte l'efluent actual de la planta (41,5 mg N/l respecte 38,0 mg N/l). L'aplicació del procés BABE, per contra, sí que ha comportat una millora de l'efluent general, arribant fins als 34 mg N/l. Tenint en compte els resultat assolits, no és possible afirmar quin procés és el més adient, ja que caldria realitzar un estudi detallat de la viabilitat de la seva implantació en cada planta
A Contribution to resource recovery from wastewater anaerobic processes for organic matter and nitrogen treatment by Núria Basset Olivé( Book )

2 editions published between 2015 and 2016 in English and held by 2 WorldCat member libraries worldwide

Operation and model description of advanced biological nitrogen removal treatments of highly ammonium loaded wastewaters by Joan Dosta Parras( Book )

2 editions published in 2007 in English and held by 2 WorldCat member libraries worldwide

Implementation of a selector for sludge settling enhancement in an activated sludge system treating petrochemical wastewater by Mª Alicia Cardete García( Book )

2 editions published in 2019 in English and held by 2 WorldCat member libraries worldwide

Due to the recent approval of the Best Available Techniques Reference Document for Wastewater Treatment in the Chemical Sector (Decision (UE) 2016/902), the European industry is urged to improve the wastewater treatments, in order to attain more stringent regulations. Particularly, petrochemical activated sludge systems focused on organic matter removal must face two frequent issues, which difficult sludge settling: i) Development of filamentous bulking due to low food-to-microorganism (F/M) ratio in the biological reactor ii) Unintended biological nitrification, which leads to denitrification in the clarifier. These tendencies were confirmed in a pilot petrochemical continuous stirred tank reactor (500 L), where sludge volumetric index (SVI) values of 350 mL g-1 were obtained. Nitrification was studied with an experimental petrochemical bench-scale bioreactor (1L), which provided concentrations up to 350 mg NOx--N L-1.To overcome the filamentous bulking, a one-compartment selector was implemented in the pilot activated sludge system. The selector could be operated as anoxic or aerobic. Both configurations succeeded to solve the excessive proliferation of filaments with average SVI values below 75 mL g-1, provided dissolved oxygen concentrations higher than 2 mg L-1 were guaranteed in the main reactor. However, the aerobic selector showed the more robust and consistent performance, aiming to its full-scale implementation. Its optimum design parameters were determined at hydraulic retention time of 30 minutes and F/M of 35 g sCOD g-1 VSS d-1. Its performance improved with the biodegradability of the wastewaters supplied in the range of 10 to 50 g BOD g-1VSS d-1. Otherwise, the selector was unable to enhance sludge settling when being provided with high concentrations of particulate matter (up from 65 g tCOD g-1 VSS d-1). Nevertheless, the inclusion of the aerobic selector doubled the nitrification rates in the activated sludge system. Since conventional methodologies to limit nitrification may not be convenient for existing installations due to process or site constraints, a new strategy has been bench-scale developed. Two petrochemical bioreactors have been supplied with cost-effective concentrations of 0.4 and 0.9 mg g-1VSS d-1 of folic acid in comparison to a control. Afterwards, the vitamin supply has been stopped in order to assess about habituation effects. Despite both doses have succeeded to control nitrification, the addition of folic acid has also affected the operational parameters of the biological system. The supply of the lower vitamin concentration provided a reduction on nitrification rates of 93.6% and improved the sludge volumetric index compared to control (17.4 in front of 67.3 mL g-1). However, its full-scale feasibility is conditioned to the availability of spare aeration capacity, since oxygen demand increased 85.7%, probably due to an older sludge age (71.4% reduction in observed sludge yield). Reductions up to 97.1% in nitrification rates were obtained during and 60 days after the dosage of the higher vitamin concentration. Despite other advantages, such as increasing the organic matter removal efficiency (60.0%) and reducing oxygen demand (14.7%) relative to control, the high dosed reactor exhibited a worse sludge settling (93.1 mL g-1) and more sludge production (57.1% increase in observed sludge yield). These results suggest new dosing alternatives, such as supplying a discontinuous folic acid concentration of 0.9 mg g-1VSS d-1.To conclude, this manuscript provides industrial engineers with guidelines to upgrade their existing wastewater treatments. Although the experimentation has been conducted with petrochemical effluents, the methodology and conclusions could be extrapolated to other industrial sectors with similar characterization of wastewater. With regard to future steps, this research sets the basis for the development of the action mechanism for nitrogen heterocyclic compounds, as nitrification inhibitors, which is of interest for the wastewater and the agricultural field
Disseny d'una línia de compostatge pel tractament de FORM : treball final de carrera d'Enginyeria Química by Joan Dosta Parras( )

1 edition published in 2003 in Catalan and held by 1 WorldCat member library worldwide

Biological granulation technology for wastewater treatment by Sílvia López Palau( )

1 edition published in 2012 in English and held by 1 WorldCat member library worldwide

Simulación de la implantación de diferentes tecnologías de recuperación de fósforo en una EDAR by Eduard Muñoz Craviotto( )

1 edition published in 2015 in Spanish and held by 1 WorldCat member library worldwide

La roca fosfática a partir de la cual se obtiene el fósforo es un recurso esencial, estratégico y limitado que se encuentra en vías de agotamiento (estimaciones en 200 años con pérdidas de competitividad en 50). Por otra parte los problemas asociados al vertido de aguas ricas en fósforo, como la eutrofización, han motivado un aumento en las exigencias de las normativas que regulan estos vertidos en las Estaciones Depuradoras de Aguas Residuales (EDAR). La recuperación de fósforo en las EDAR supone una oportunidad para reducir la dependencia de la roca fosfática y el contenido de fósforo en sus efluentes de forma que se cumplan las exigencias de las normativas vigentes. Además del beneficio ambiental, la recuperación de fósforo puede realizarse en forma de estruvita que puede ser comercializada como producto fertilizante, lo que ofrece una oportunidad de rentabilizar estos procesos de recuperación. Este proyecto pretende estudiar el rendimiento y viabilidad técnico-económica de la implantación de un sistema de recuperación de fósforo como estruvita en una EDAR, así como los efectos de la implantación sobre la operación normal de ésta. Para ello se ha realizado una revisión de tecnologías existentes que permiten la recuperación de fósforo y se ha seleccionado una EDAR para este estudio: la planta de El Prat de Llobregat. Para estudiar el rendimiento y el efecto sobre la EDAR de varios sistemas de recuperación de fósforo se ha recurrido a un software específico: BioWin 4.0, con el que se han realizado simulaciones en distintas condiciones de operación (pH 7,00 a 9,25 con ratios molares magnesio:fosfato 1:1 hasta 2:1 en el reactor del sistema de recuperación). De los sistemas de recuperación analizados se estudia la implantación de tres de ellos: Ostara Pearl, Ostara Pearl + Wasstrip, y Nuresys. De estas simulaciones se ha llegado a la conclusión de que el efecto sobre el resto de equipos de la EDAR y su operativa habitual es mínimo, el comportamiento de los sistemas de recuperación es el mismo y que los resultados son similares en los tres casos, aunque el sistema combinado Pearl + Wasstrip de Ostara presenta unos resultados ligeramente mejores debido a la presencia de una etapa de liberación de nutrientes antes del sistema de recuperación. Se estima el potencial de estruvita recuperada entre 165 y 670 toneladas anuales para unas condiciones de operación de pH 7 y 8, respectivamente, y una adición de magnesio tal que la proporción molar magnesio:fosfato en el reactor del sistema de recuperación es 1:1. El estudio de viabilidad aproximado muestra que la implantación de este tipo de tecnologías en la EDAR puede ser viable y que es posible alcanzar periodos de retorno de la inversión menores a 8 años en determinadas condiciones
Depuració d'aigües residuals vitivinícoles mitjançant un bioreactor de membrana (BRM) by Mònica Roca Moliner( )

1 edition published in 2010 in Catalan and held by 1 WorldCat member library worldwide

Estudi del procés de nitrificació del sobrenedant de digestió anaeròbia de fangs de depuradora amb biomassa suspesa i granulada by Ricard Wakefield López( )

1 edition published in 2010 in Catalan and held by 1 WorldCat member library worldwide

 
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Alternative Names
Joan Dosta onderzoeker

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