437 research outputs found
Self-fermentation: Innovative pretreatment for use high concentration of olive mill wastewater in anaerobic digestion plant
No full textThis study aimed to evaluate the impact of self fermentation on methane production as biological pretreatment of olive mill wastewater (OMW). The self-fermentation was carried out at room temperature without mixing and at natural light cycle. The batch assays were performed at the influent substrate concentration of 36.7 g VS/l (OMW 100%), 18,4 g VS/l (OMW 50%) and 9.2 g VS/l (OMW 25%). The methane production was performed at 37°C in mixing condition. The results of methane production were compared with those obtained using untreated OMW. The results of this study showed that the self fermentation process is a very effective pretreatment to produce methane. Only the self-fermented samples have produced methane from undiluted OMW and a maximum cumulative methane production of 7583 ± 138 mlCH4/L and a yield of 246 ± 10 mlCH4/ gVS were obtained. A yield increase of +13.5% at OMW dilution of 50% was also achieved as compared to untreated OMW results. Interestingly, in the anaerobic digestion of untreated OMW, high hydrogen yields, with an average value of 46.8 ± 1.9 mlH2/gVS, were obtained. Moreover a depletion around 20% v/v of polyphenols was recorded for all experimental set. © 2016 ETA-Florence Renewable Energies
The Topological Weighted Centroid (TWC): A topological approach to the time-space structure of epidemic and pseudo-epidemic processes
No full textThis paper offers the first systematic presentation of the topological approach to the analysis of epidemic and pseudo-epidemic spatial processes. We introduce the basic concepts and proofs, at test the approach on a diverse collection of case studies of historically documented epidemic and pseudo-epidemic processes. The approach is found to consistently provide reliable estimates of the structural features of epidemic processes, and to provide useful analytical insights and interpretations of fragmentary pseudo-epidemic processes. Although this analysis has to be regarded as preliminary, we find that the approach’s basic tenets are strongly corroborated by this first test and warrant future research in this vein
Biographical Introduction and Summary of Contents
No full textIn this introduction, MA student Laura Massini Nielsen analyses the role of the aurora borealis in Biergtrolden (The Mountain Troll), the very first poem of the seminal debut collection of Digte (Poems) by the Danish Romantic author Adam Oehlenschläger. The article begins with a biographical introduction, followed by a short overview of the Danish Golden Age that provides context for the reader. Massini Nielsen then briefly outlines Oehlenschläger’s works and, in conclusion, focuses on the poem Biergtrolden and on the role of the aurora borealis in it
Biocides electrogeneration for a zero-reagent on board disinfection of ballast water
No full textThe feasibility of a quick electrochemical process for on board zero-reagent treatment of ballast water by anodic and cathodic production of oxidants was proposed. The process has been tested in the inactivation of the marine dinoflagellates Alexandrium minutum and A. taylori, both responsible for algal blooms and toxin-producing, and against the marine bacterium Pseudomonas aeruginosa, a Gram-negative pathogenic micro-organism. A complete inactivation of both dinoflagellates was quickly achieved with electro-generated active chlorine, while higher resistance to oxidising agents was verified for P. aeruginosa. A combined sequential treatment involving anodic oxidation followed by extended exposure time in the absence of current, and a final cathodic treatment was proposed. The cathodically electro-generated hydrogen peroxide contributed to the reduction of treatment time and the removal of residual species. © 2012 Springer Science+Business Media Dordrecht
From polluting seafood wastes to energy. production of hydrogen and methane from raw chitin material by a two-phase process
No full textHydrogen is a clean energy carrier having great potential as alternative fuel. Despite its well-established production, by chemical/electrochemical processes, bio-conversion of organic wastes to hydrogen could be a sustainable alternative since the afore-mentioned methods require a lot of energy. Anaerobic digestion to bio-methane is considered a winning strategy to transform wastes into energy with reduction of environmental issues. Chitin is the second most abundant polysaccharide after cellulose. Huge amounts of chitinous wastes, produced from seafood industry and fungal fermentation plants, represent source of pollution if improperly disposed. In this paper the feasibility to obtain hydrogen and methane in a two-phase anaerobic bio-process using raw chitin was investigated. After a preliminary aerobic pre-hydrolysis, carried out by the chitinolytic fungus Lecanicillium muscarium CCFEE 5003, H2, was obtained by dark fermentation and CH4, subsequently, by further digestion. For best productions, pre-hydrolysis was optimised by response surface methodology. Highest hydrogen (147 ml/1) and methane (7713 ml/1) levels were obtained after 24 days of dark fermentation and 83 days of digestion, respectively. However, best productivities were obtained at day 14 and 30 for H2, and CH4, respectively. This work is the first attempt to use raw chitin to obtain these biofuels by dark fermentation and anaerobic digestion
Transfert e personaggi/autori nelle prime pièces di Massini
No full textMassini avvicina la composizione drammatica narrando percorsi che riflettono i suoi miti e la sua condizione esperienziale. Per questo, nelle sue prime pièces, un personaggio/artista perviene a riconoscere il proprio lato creativo confrontandosi con un interlocutore che ne indaga le motivazioni
Flow diversion in aseptic processing and packaging systems: how guidelines allow avoiding bad design
No full textStudio degli accumuli di detrito organico sui fondali del lago di Nemi: Nota II - Rapporti nella biomassa stabile.
No full textProcedure for checking conformity to regulations and standards to ensure food safety and process optimization in continuous thermal processing plants
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