1,720,966 research outputs found
Biomethanization and decontamination of olive mill wastewaters through an integrated anaerobic-aerobic biofilm process
No full textDue to their high COD content, olive mill wastewaters (OMWs) have to be treated before being discharged. Anaerobic digestion is one of the most promising remediation solution for OMWs as it is able to mediate both their decontamination and valorization (by the production of a CH4-rich biogas). The possibility of intensifying the performances of this process by performing it in an anaerobic digestor packed with granular active carbon was recently demonstrated. In order to further remove the COD from the effluent of the developed system, an aerobic post-treatment, constituted by a column reactor packed with silica beads, directly fed with the outlet of the anaerobic plant and colonized by the influent native microflora, was integrated to the anaerobic bioreactor. A 2 month-continuous mode experiment was carried out by feeding the integrated anaerobic-aerobic system with an amended OMW. The COD load with which the reactors were fed were 31.9 and 52.2 g/(ld) for the anaerobic and the aerobic plant, respectively. The integrated system was found to remove the 58% of the inlet COD, and the aerobic post-treatment contributed for 1⁄4 of such removal yield. In order to better understand the biological process, the composition of the bacterial communities of both the anaerobic and the aerobic reactors were characterized
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
OLIVE MILL WASTEWATER TREATMENT AND VALORIZATION THROUGH AN ANAEROBIC-AEROBIC INTEGRATED PROCESS IN PACKED-BED BIOFILM REACTORS
No full textOLIVE MILL WASTEWATER TREATMENT AND VALORIZATION THROUGH AN ANAEROBIC-AEROBIC INTEGRATED PROCESS IN PACKED-BED BIOFILM REACTORS
No full textAppropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Use of packed-bed bioreactors in an anaerobic-aerobic integrated process for the treatment and the valorization of olive mill wastewater
No full textOlive mill wastewaters treatment and valorisation in biofilm reactors packed with granular activated carbon or silica beads
No full textAlthough anaerobic digestion is one of the most promising technologies for disposing olive mill wastewaters (OMWs), OMW toxic phenols tend to persist in conventional dispersed growth bioreactor effluents. The possibility of achieving a satisfactory OMW decontamination in biofilm packed bed reactors was here investigated. An OMW-digesting microbial consortium was passively immobilized in column reactors packed with granular activated carbon or “Manville” silica beads. Under batch conditions, both biofilm reactors exhibited OMW COD and phenolic compound removal efficiencies markedly higher than those attained in an anaerobic dispersed growth bioreactor developed with the same inoculum and OMW. Under continuous conditions GAC-reactor showed COD and phenolic compound depletion efficiencies along with a tolerance to high and variable organic loads largely higher than those averagely displayed by most of the conventional and packed-bed laboratory-scale reactors previously proposed for the OMW digestion
PERFORMANCES AND MICROBIAL FEATURES OF AN INTEGRATED ANAEROBIC-AEROBIC BIOFILM PROCESS FOR THE BIOGASIFICATION AND DECONTAMINATION OF OLIVE MILL WASTEWATERS
No full textDue to their high COD content, olive mill wastewaters (OMWs) have to be treated before being discharged. Anaerobic digestion is one of the most promising remediation solution for OMWs as it is able to mediate both their decontamination and valorization (by the production of a CH4-rich biogas). The possibility of intensifying the performances of this process by performing it in an anaerobic digestor packed with granular active carbon was recently demonstrated. In order to further remove the COD from the effluent of the developed system, an aerobic post-treatment, constituted by a column reactor packed with silica beads, directly fed with the outlet of the anaerobic plant and colonized by the influent native microflora, was integrated to the anaerobic bioreactor. A 2 month-continuous mode experiment was carried out by feeding the integrated anaerobic-aerobic system with an amended OMW. The COD load with which the reactors were fed were 31.9 and 52.2 g/(ld) for the anaerobic and the aerobic plant, respectively. The integrated system was found to remove the 58% of the inlet COD, and the aerobic post-treatment contributed for 1⁄4 of such removal yield. In order to better understand the biological process, the composition of the bacterial communities of both the anaerobic and the aerobic reactors were characterized
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