Search results for " Ingegneri"
showing 10 items of 809 documents
Disoleatori statici per il trattamento delle acque di piccole e medie utenze
2012
Per rimuovere gli olii dalle acque reflue di piccole e medie utenze si utilizzano molto i disoleatori prefabbricati. Le verifiche di tre disoleatori commerciali di tipo statico hanno suggerito il limite inferiore per il tempo di detenzione idraulica, e quello superiore per il carico superficiale. Le vasche bi-stadio non hanno dimostrato vantaggi sulle mono-stadio.
Impianto perfezionato per il trattamento di acque reflue
2019
Negli ultimi anni, a causa dell’incremento dei costi di smaltimento dei fanghi prodotti nel corso dei processi depurativi basati su metodi biologici, si va diffondendo sempre più la tendenza e la necessità di ridurne la produzione direttamente alla fonte, ovvero nel corso dello stesso processo che li genera. Diversi metodi sono proposti in letteratura e molti di essi sono già coperti da brevetto (OSA®, Cannibal®, Biminnex®), applicati ai processi biologici a fanghi attivi convenzionali (CAS). Il limite di questi processi è che una riduzione molto spinta della produzione di fango di supero, ottenuta sottoponendo la biomassa a stress biologico, comporta significativi peggioramenti della quali…
R&D ALLIANCE TIMING IN THE BIOPHARMACEUTICAL INDUSTRY: A REAL OPTIONS GAME APPROACH.
Greenhouse gas emissions from membrane bioreactors
2018
Nowadays, it is widely accepted that wastewater treatment plants (WWTPs) are significant sources of greenhouse gas (GHG) emission, significantly contributing to anthropogenic sources of GHG emission. Among the GHG emitted from WWTPs, nitrous oxide (N2O) has been identified as the potentially major component, since its high global warming potential (GWP) is 298 times higher than that of Carbon dioxide (CO2) and also to its capability to react with stratospheric ozone, causing the ozone layer depletion. Up to now, most of the experimental investigations aimed at assessing the key mechanisms of N2O formation, as well as the operational conditions that can enhance its emission, have been carrie…
How strategic needs influence alliance formation and their governance modes: An empirical study in the Italian biopharmaceutical industry
2011
Firms enter strategic alliances for various reasons, and the motives behind formation of these alliances are one of main research subjects in the management field. The large literature on the issue has highlighted how alliances answer to a strategic need for collaboration that is the need to improve competitive strength through collaboration agreements. However, the study here addresses the strategic need perspective to alliances under a more specific point of view. We question what kind of competitive strengths firms aim at acquiring through inter-firm relationships. By reviewing of the most relevant literature on the issue we assume that alliances respond to three principal strategic need…
A new approach for assessing minimum flow in ephemeral streams
2009
The aim of this paper is to propose a new methodological approach, appropriate for low-yielding catchments, by calculating the ecological minimum river flow starting from the river water quality based on biological indicators and physical–chemical characteristics as reported in the Italian Water Law no. 152/06 and in the UE 2000/60 Directive (WFD: Water Framework Directive). Actually, protecting and restoring river flow regimes and hence the ecosystems they support by providing environmental flows, has become a major aspect of river basin management. In detail, pollutant concentrations downstream and fluvial structure cross-sections have been evaluated, starting from discharges released dow…
Effect of long-term salinity increase on nitritation and denitritation kinetics in activated sludge and granular sludge reactors
2017
The aim of this work was to investigate the effects of moderate and drastic long-termincrease of salinity.Particularly, the study was aimed at assessing the shock effecton nitritationand denitritation kineticsof halophilic biomass inboth forms:flocculent activated sludge and granular sludge.
Heterogeneous Photocatalysis for Selective Formation of High-Value-Added Molecules: Some Chemical and Engineering Aspects
2018
This review deals with the parameters that influence heterogeneous photocatalysis (PC) for selective synthesis of high-value chemicals by itself or in combination with other technologies. In particular, the parameters related to the photocatalysts, such as crystallinity degree, type of polymorph, surface acid-base properties, exposure of particular crystalline facets, coupling of different semiconductors, position of the valence and conduction band edge, addition of doping agents, and those related to the reaction system, such as setup configuration and reactor geometry, type of solvent, type and amount of photocatalyst, affecting the selectivity toward specific products are described and d…
Ammonium adsorption, desorption and recovery by acid and alkaline treated zeolite
2021
In this study, the suitability of zeolite as a possible medium for ammonium adsorption, desorption and recovery from wastewater was investigated. Specifically, batch adsorption and desorption studies with solutions enriched in NH$_4^+$ were conducted employing zeolite to evaluate how the chemical treatment and contact time affect adsorption and desorption. Several experimental tests were carried out considering both untreated and treated zeolite. Untreated and HCl-Na treated zeolite adsorbed up to 11.8 mg NH$_4^+$ g$^{-1}$ and showed the highest efficiency in recovering NH$_4^+$ from aqueous solution. Regardless of pre-treatment, treatments with NaCl resulted in higher and faster adsorption…
Water Fluxes in Polymeric Membranes for Desalination via Membrane Distillation
2010
Membrane distillation is an emerging technique for seawater desalination. Hydrophobic polymeric membranes are used to separate the solute‐free water vapour from the hot solution. Vapour fluxes of commercial polymeric membranes were measured in various conditions, i.e. natural and forced convection and vacuum. Vapour fluxes were also predicted with models and compared with experimentals. Higher fluxes were recorded in vacuum conditions.