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rss_1.0 Recursos de colección

UPCommons - E-prints UPC Universitat Politècnica de Catalunya (71,740 recursos)
E-prints UPC cobreix dues finalitats: per una banda, és el dipòsit institucional de la UPC que recull els articles de revista, les comunicacions de congrés i els reports de recerca generats en les activitats de recerca del personal docent i investigador de la universitat; per l'altra, és una eina que permet accelerar la producció científica, allotjant versions de documents prèvies a la publicació en una revista o a les actes d’un congrés.

Articles de revista

Mostrando recursos 1 - 11 de 11

1. Microalgae conversion to biogas: Thermal pretreatment contribution on net energy production - Passos, Fabiana Lopes del Rei; Ferrer Martí, Ivet
Microalgal biomass harvested from wastewater treatment high rate algal ponds may be valorised through anaerobic digestion producing biogas. However, microalgae anaerobic biodegradability is limited by their complex cell wall structure. Thus, pretreatment techniques are being investigated to improve microalgae methane yield. In the current study, thermal pretreatment at relatively low temperatures of 75-95 °C was effective at enhancing microalgae anaerobic biodegradability; increasing the methane yield by 70% in respect to nonpretreated biomass. Microscopic images showed how the pretreatment damaged microalgae cells, enhancing subsequent anaerobic digestion. Indeed, digestate images showed how after pretreatment only species with resistant cell walls, such as...

2. The Cartridge theory: A description of the functioning of horizontal subsurface flow constructed wetlands for wastewater treatment, based on modelling results - Samsó Campà, Roger; García Serrano, Joan
Despite the fact that horizontal subsurface flow constructed wetlands have been in operation for several decades now, there is still no clear understanding of some of their most basic internal functioning patterns. To fill this knowledge gap, on this paper we present what we call

3. Attenuation of emerging organic contaminants in a hybrid constructed wetland system under different hydraulic loading rates and their associated toxicological effects in wastewater - Ávila Martín, Cristina; Matamoros, Victor; Reyes, Carolina; Pina, Benjamin; Casado, Marta; Mita, Luigi; Rivetti, Claudia; Barata Martí, Carlos; García Serrano, Joan; Bayona, Josep M.
The capacity of a hybrid constructed wetland (CW) system consisting of two vertical flow (VF) CWs working alternatively (3 m(2)), one horizontal flow (HF) CW (2 m(2)) and one surface flow (FWS) CW (2 m(2)) in series to eliminate 13 emerging organic contaminants (EOCs) under three different hydraulic loading rates (HLRs) (0.06, 0.13 and 0.18 m d(-1) considering the area of the two VF beds) was studied through a continuous injection experiment General toxicity, dioxin-like activity, antimicrobial activity and estrogenicity were also measured under the highest hydraulic loading rate. The hybrid system was highly efficient on the removal of total...

4. Emerging organic contaminants in vertical subsurface flow constructed wetlands : Influence of media size, loading frequency and use of active aeration - Ávila Martín, Cristina; Nivala, Jaime; Olsson, Linda; Kassa, Kinfe; Headley, Tom; Mueller, Roland A.; Bayona, Josep Maria; García Serrano, Joan
Four side-by-side pilot-scale vertical flow (VF) constructed wetlands of different designs were evaluated for the removal of eight widely used emerging organic contaminants from municipal wastewater (i.e. ibuprofen, acetaminophen, diclofenac, tonalide, oxybenzone, triclosan, ethinylestradiol, bisphenol A). Three of the systems were free-draining, with one containing a gravel substrate (VGp), while the other two contained sand substrate (VS1p and VS2p). The fourth system had a saturated gravel substrate and active aeration supplied across the bottom of the bed (VAp). All beds were pulse-loaded on an hourly basis, except VS2p, which was pulse-loaded every 2h. Each system had a surface area of...

5. Emerging organic contaminant removal depending on primary treatment and operational strategy in horizontal subsurface flow constructed wetlands : Influence of redox - Ávila Martín, Cristina; Reyes, Carolina; Bayona, Josep Maria; García Serrano, Joan
This study aimed at assessing the influence of primary treatment (hydrolytic upflow sludge blanket (HUSB) reactor vs. conventional settling) and operational strategy (alternation of saturated/ unsaturated phases vs. permanently saturated) on the removal of various emerging organic contaminants (i.e. ibuprofen, diclofenac, acetaminophen, tonalide, oxybenzone, bisphenol A) in horizontal subsurface flow constructed wetlands. For that purpose, a continuous injection experiment was carried out in an experimental treatment plant for 26 days. The plant had 3 treatment lines: a control line (settler-wetland permanently saturated), a batch line (settler-wetland operated with saturate/unsaturated phases) and an anaerobic line (HUSB reactor-wetland permanently saturated). In each line, wetlands had a...

6. Reliability, repeatability and accuracy of the falling head method for hydraulic conductivity measurements under laboratory conditions - Pedescoll Albacar, Anna; Samsó Campà, Roger; Romero Morales, Enrique Edgar; Puigagut Juárez, Jaume; García Serrano, Joan
The aim of this study was to verify under lab conditions the reliability, repeatability and accuracy of the falling head method (FHM) for hydraulic conductivity measurements. TheFHMis a reliable procedure that has slight variations (less than 10%) in repeated measurements and turns out to be a reliable technique to record the hydraulic conductivities typically described for clogged and unclogged subsurface-flow constructed wetlands (from 4 to ca. 360 m/day). The accuracy of the method is acceptable considering difficulties in the measurement of hydraulic conductivity in highly conductive media. Accordingly, results show measurement deviations of 20% when compared with a laboratory constant head method for...

7. Tratamiento de lodos de depuradora con humedales artificiales - Uggetti, Enrica; Ferrer Martí, Ivet; Castellnou, Roger; Molist, Jordi; García Serrano, Joan
Hoy en día la gestión del lodo de depuradora es un tema clave dentro del tratamiento del agua residual, representando hasta el 60% de los costes de operación de una depuradora urbana. El elevado contenido de agua del lodo encarece su gestión, justificando la necesidad de desarrollar métodos simples y económicos para reducir su volumen. Durante las últimas décadas, se ha adaptado la tecnología de los humedales construidos o lechos de macrófitos a la deshidratación del lodo. Como principales ventajas destacan una demanda energética, costes de operación y mantenimiento reducidos, y una buena integración en el paisaje. Sin embargo, el número...

8. Techno-economical evaluation of water reuse for wetland restoration: a case study in a natural park in Catalonia, Northeastern Spain - Seguí Amórtegui, Luis Alberto; Alfranca Burriel, Òscar; García Serrano, Joan
The main interest of the methodology for the investigation of wastewater reclamation and reuse systems which is proposed in this paper is that all costs and benefits (social and private) are considered in the economic and technological analysis. This general concern allows an improvement in the design of investment decisions. Traditionally, an economic-financial analysis of wastewater reclamation and reuse systems focuses exclusively on the study of costs and private benefits. The methodology that is presented in this paper takes into account not only the private impacts but also the project spillovers which could have relevance on the project. In this research, the use value of the...

9. Sludge treatment wetlands: a review on the state of the art - Uggetti, Enrica; Ferrer Martí, Ivet; Llorens Ribes, Esther; García Serrano, Joan
Sludge management has become a key issue in wastewater treatment, representing some 20–60% of the operational costs of conventional wastewater treatment plants. The high water content of the sludge results in large daily flow rates to be handled and treated. Thus, the search for methods to improve sludge volume reduction continues to be of major interest. The technology known as sludge treatment wetlands has been used for sludge dewatering since the late 1980s. Major advantages include its low energy requirements, reduced operating and maintenance costs, and a reasonable integration in the environment. However, the number of plants in operation is still low...

10. Adaptación de biodigestores tubulares de plástico a climas fríos - Poggio, Davide; Ferrer Martí, Ivet; Batet Miracle, Lluís; Velo García, Enrique
Farmers in the Andean Plateau strongly demand for household biodigesters due to the lack of clean fuels and agricultural fertilizers, and the abundance of livestock residues. The diffusion of rural biodigesters in cold climate or mountainous rural zones has been traditionally scarce. The unfavorable relationship between low temperatures and the kinetics of biogas production poses a technological barrier to the implementation of low cost biodigesters. Since 2006, the Research Group on Development Cooperation and Human Development (GRECDH) from the Technical University of Catalonia (UPC), in collaboration with the Peruvian NGO Institute for an Alternative Agriculture (IAA), investigates on the development of household biodigesters adapted...

11. Climate and CO2 saturation in an alpine lake throughout the Holocene - Catalán, Jordi; Pla, S; García Serrano, Joan; Camarero, L
This study shows that diatom sediment records can be used to investigate the long-term inorganic carbon dynamics in oligotrophic and poorly acid-buffered lakes. Using a training set of 115 high-mountain lakes in the Pyrenees, we found that both alkalinity and potential hydrogen (pH) independently explained some of the variability in diatom assemblages. Transfer functions for both variables were developed and applied to a Holocene record from Lake Redon and CO2 changes calculated. CO2 saturation broadly followed alkalinity, which in turn was related to summer and autumn air-temperature fluctuations. In general, warmer climate during the ice-free period led to higher supersaturation, due...

 

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