Sunday, August 31, 2014

 

 



Soy un nuevo usuario

Olvidé mi contraseña

Entrada usuarios

Lógica Matemáticas Astronomía y Astrofísica Física Química Ciencias de la Vida
Ciencias de la Tierra y Espacio Ciencias Agrarias Ciencias Médicas Ciencias Tecnológicas Antropología Demografía
Ciencias Económicas Geografía Historia Ciencias Jurídicas y Derecho Lingüística Pedagogía
Ciencia Política Psicología Artes y Letras Sociología Ética Filosofía
 

rss_1.0 Recursos de colección

UPCommons - E-prints UPC Universitat Politècnica de Catalunya (67,496 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 - 6 de 6

1. 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...

2. 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...

3. 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...

4. 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...

5. 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...

6. 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...

 

Busque un recurso