P-recovery in a pilot-scale struvite crystallisation reactor for source separated urine systems using seawater and magnesium chloride as magnesium sources

[EN] Practical recovery of a non-renewable nutrient, such as phosphorus (P), is essential to support modern agriculture in the near future. The high P content of urine, makes it an attractive source for practicing the recovery of this crucial nutrient. This paper presents the experimental results at pilot-plant scale of struvite crystallisation from a source-separated urine stream using two different magnesium sources, namely magnesium chloride and seawater. The latter was chosen as sustainable option to perform P-recovery in coastal areas. Real seawater was used to assess in a more realistic way its efficiency to precipitate P as struvite, since its composition (with noticeable concentration of ions such as Ca2+, SO42¿, Na+, ¿) could lead to the formation of impurities and other precipitates. 0.99¿g of struvite was obtained per litre of urine irrespective of the operational conditions tested. In all tested conditions, precipitation efficiencies exceeded 90% and recovery efficiencies were higher than 87%, with an average struvite crystal size higher than 110¿¿m (and up to 320¿¿m, depending on the experimental conditions) in the harvested struvite samples. Almost pure struvite was obtained when MgCl2 was used as precipitant, while amorphous calcium phosphate and other impurities appeared in the precipitates using seawater as magnesium source. However, the lower settling velocity of the amorphous precipitates in comparison with the struvite precipitates suggests that their separation at industrial scale could be relatively straightforward.This research work was possible thanks to FCC Aqualia participation in INNPRONTA 2011 IISIS IPT-20111023 project (partially funded by The Centre for Industrial Technological Development (CDTI) and supported by the Spanish Ministry of Economy and Competitiveness).Aguado García, D.; Barat, R.; Bouzas Blanco, A.; Seco Torrecillas, A.; Ferrer, J. (2019). P-recovery in a pilot-scale struvite crystallisation reactor for source separated urine systems using seawater and magnesium chloride as magnesium sources. The Science of The Total Environment. 672:88-96. https://doi.org/10.1016/j.scitotenv.2019.03.485S889667

CALIDAD DE UN CURSO VIRTUAL DE E-LEARNING EN CIENCIAS DE LA SALUD

A descriptive study was conducted in order to evaluate the quality of a virtual course on teacher training, using the Evaluation Model of the Virtual Continuous Training Courses of the Latin American Institute for Quality in Distance Education (CALED, in Spanish). By applying a checklist and four questionnaires, there were analyzed 72 indicators for the following areas: Technological quality, training, instructional design and services and support. The results indicate a partial accomplishment of the quality standards. The areas of greatest fulfillment in descending order were training, instructional design and services and support. In the area of technological quality most of the requirements were met, but in many cases, no required records were found as evidence at the time of the assessment.Se realizó una investigación descriptiva con el objetivo de evaluar la calidad de un curso virtual de formación docente, usando el Modelo de Evaluación de Cursos Virtuales de Formación Continua del Instituto Latinoamericano de Calidad en Educación a Distancia (CALED). Mediante la aplicación de una lista de verificación y cuatro cuestionarios, se analizaron 72 indicadores de las áreas: calidad tecnológica, formación, diseño instruccional y servicios y soporte. Los resultados indican cumplimiento parcial de los estándares de calidad. Las áreas de mayor cumplimiento en orden decreciente fueron: formación, diseño instruccional y servicios y soporte. En el área de calidad tecnológica se cumple con la mayoría de los requerimientos y en algunos casos no se encontraron registros requeridos como evidencias de la evaluación. QUALITY OF AN E-LEARNING VIRTUAL COURSE IN HEALTH SCIENCES AbstractA descriptive study was conducted in order to evaluate the quality of a virtual course on teacher training, using the Evaluation Model of the Virtual Continuous Training Courses of the Latin American Institute for Quality in Distance Education (CALED, in Spanish). By applying a checklist and four questionnaires, there were analyzed 72 indicators for the following areas: Technological quality, training, instructional design and services and support. The results indicate a partial accomplishment of the quality standards. The areas of greatest fulfillment in descending order were training, instructional design and services and support. In the area of technological quality most of the requirements were met, but in many cases, no required records were found as evidence at the time of the assessment. Keywords: Distance education; educational evaluation; educational quality; teacher education.

Humo : poesías originales

Copia digital : Diputación de Málaga. Biblioteca Canovas del Castillo, 201

Effect of different quality irrigation water on the growth, mineral concentration and physiological parameters of Viburnum tinus plants

Treated wastewater may be considered an alternative source of water and fertilizer nutrients for landscape plants. However, NaCl, the principal compound in this water, can be detrimental to plants. Viburnum tinus plants were submitted for 4 months to 4 irrigation treatments with water from different sources: control (Control) (EC < 0.9 dS m-1); NaCl solution (NaCl) (EC = 4 dS m-1); irrigation water normally used in the area (IW) (EC = 1.2-1.8 dS m-1) and reclaimed water (RW) (EC = 4 dS m-1). During a recovery period of two months, all the plants were irrigated with the control water. The results showed that biomass was affected in NaCl, IW and RW treatments, both leaf area and height decreased at the end of saline period. These changes were more pronounced in the NaCl treatment, which also caused a decrease in stem diameter and root/shoot ratio. The similar growth alterations founded after the recovery period showed that salts continued to be present in the substrate. Compared with the control, NaCl and RW plants showed a greater rate of Na+ and Cl- absorption by roots. Stem water potential was mainly affected by the NaCl treatment in the last weeks of the saline period. Through the experiment, the stomatal conductance and photosynthesis values were the lowest in plants that received the highest amount of salts, especially NaCl treatment which was the only treatment that did not recover at the end of experiment. Plants of the IW treatment showed slight changes in stomatal conductance and photosynthetic rate with respect to the control, although the reduction in the growth and size of these plants suggests that slight increases in EC could be very toxic for this species. Hence, using different sources of water with similar EC, (NaCl and RW) it is important to know the exact composition, since the toxic effects produced by high concentrations of Na+ and Cl- might be offset by the effect of other ions like magnesium, potassium and phosphorus. In the physicochemical analysis of water, the highest concentrations of these ions were observed in RW and as consequence, their concentrations in plants were not reduced by the Na+ and Cl- effect, phosphorus even increased, improving the plant nutritional balance.This work was supported by the projects: CICYT (AGL 2008- 05258-CO2-1-2- AGR and AGL 2011-30022-CO2-01-02), Fundación Séneca (15356/PI/10) and Vías y Construcción, S. A. (CDTI IDI-20101191).Peer Reviewe

Peutz-Jeghers syndrome and duodeno-jejunal adenocarcinoma-therapeutic implications

The Peutz-Jeghers syndrome (PJS) is an autosomal dominant hamartomatous poliposis describred in 1921. Hemminki in 1997 described the presence of LKB-1 mutation tumor-suppressor gen.The patients with PJS develop a higher cumulative incidence of gastrointestinal, pancreas and extraintestinal tumors, being occasion of a renew interest on hamartomatous polyposis syndromes regarding the clinical care, cancer surveillance treatment and long term follow-up.We report the case of a 38 years old male, diagnosed of PJS who developed a multiple adenocarcinoma in duodenum and yeyunum. Surgically treated and with a long-term free disease survival of 11 years represents the sixth case reported in the spanish literature of PJS associated with a gastrointestinal tumor.A critical review, molecular alterations and the established criteria of tumor screening and surveillance are reviewed

New frontiers from removal to recycling of nitrogen and phosphorus from wastewater in the Circular Economy

[EN] Nutrient recovery technologies are rapidly expanding due to the need for the appropriate recycling of key elements from waste resources in order to move towards a truly sustainable modern society based on the Circular Economy. Nutrient recycling is a promising strategy for reducing the depletion of non-renewable resources and the environmental impact linked to their extraction and manufacture. However, nutrient recovery technologies are not yet fully mature, as further research is needed to optimize process efficiency and enhance their commercial applicability. This paper reviews state-of-the-art of nutrient recovery, focusing on frontier technological advances and economic and environmental innovation perspectives. The potentials and limitations of different technologies are discussed, covering systems based on membranes, photosynthesis, crystallization and other physical and biological nutrient recovery systems (e.g. incineration, composting, stripping and absorption and enhanced biological phosphorus recovery).Robles Martínez, Á.; Aguado García, D.; Barat, R.; Borrás Falomir, L.; Bouzas Blanco, A.; Bautista-Giménez, J.; Martí Ortega, N.... (2020). New frontiers from removal to recycling of nitrogen and phosphorus from wastewater in the Circular Economy. Bioresource Technology. 300:1-18. https://doi.org/10.1016/j.biortech.2019.122673S11830

A cloud-enabled small cell architecture in 5G networks for broadcast/multicast services

© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.The evolution of 5G suggests that communication networks become sufficiently flexible to handle a wide variety of network services from various domains. The virtualization of small cells as envisaged by 5G, allows enhanced mobile edge computing capabilities, thus enabling network service deployment and management near the end user. This paper presents a cloud-enabled small cell architecture for 5G networks developed within the 5G-ESSENCE project. This paper also presents the conformity of the proposed architecture to the evolving 5G radio resource management architecture. Furthermore, it examines the inclusion of an edge enabler to support a variety of virtual network functions in 5G networks. Next, the improvement of specific key performance indicators in a public safety use case is evaluated. Finally, the performance of a 5G enabled evolved multimedia broadcast multicast services service is evaluated.Peer ReviewedPostprint (author's final draft