Search results for "ozonation"
showing 10 items of 35 documents
Photocatalytic Ozonation: from Science to Aquaculture Applications
2016
Demographic growth and management of water and food resources are probably the most challenging issues of the coming years. In this scenario, intensive aquacultura will be increasingly important in the near future
Centroid-based Cluster Analysis of HVSR Data for Seismic Microzonation
2014
Horizontal to Vertical Spectral Ratio (HVSR) datasets acquired for studies of seismic microzoning in various urban centers of Sicilian towns, have been used to test clustering analysis through a nonhierarchical centroid-based algorithm. In this context clustering techniques may be useful to identify areas with similar seismic behaviour through HVSR data. Centroid-based algorithms generally require the number of clusters, k, and the initial centroid coordinates to be specified in advance. This aspect is considered to be one of the biggest drawbacks of these algorithms. The proposed algorithm doesn’t limit the number of k clusters and choose the initial centroids automatically from the data s…
Seismic Characterization by Inversion of HVSR Data to Improve Geological Modelling
2014
SUMMARY An application of HVSR inversion is presented in order to verify the effectiveness of this technique for purposes of geological reconstruction of the subsoil finalized to studies of seismic microzonation of heavily urbanized areas, where few stratigraphic and geophysical constraints are available and most of the information are derived from the geological maps. In such cases the uncertainty of the results is is enhanced by doubts on the nature of the H/V peaks, not always caused by stratigraphic discontinuities, and to the subjective choices done especially in the step of signal preprocessing. The investigated area (Altavilla Milicia, Sicily) includes the town center and the adjacen…
The integration of surface and subsurface stratigraphic data with HVSR measures for studies of seismic microzonation: the case of Oliveri (ME)
2013
Because of its high seismic hazard the urban area of Oliveri has been subject of a study on seismic microzonation at first level (OPCM 3907/2010). The urban area develops on a large coastal plain made of Late Pleistocene and Holocene mixed fluvial/marine sediments, that mainly consist of silty sands and gravels. The eastern part of this plain is dominated by the alluvial deposits of the Elicona torrent. The coastal and alluvial sediments overlap a complexly deformed substrate made of Hercynian metamorphites (Aspromonte unit), the Capo d’Orlando Flysch, the Antisicilide Argille Scagliose and Pleistocene clays and calcarenites. This area is affected by high uplift rates as recently estimated …
Process Intensification through Coupled Photocatalysis-Ozonation of Contaminated Bromide Containing Waters
2013
Strategy assessment to mediate between purification targets and bromate production during purification of bromide containing water by means of photoc…
2013
Process Intensification by Using Ozonation Coupled with TiO2 Photocatalysis for Treating Bromide and/or Bromate Ions Containing Water: The Role of Co…
2014
Photocatalytic Ozonation of Bromide Containing Waste Water: Related Problems and Kinetics Based Strategy Evaluation
2015
In the so-called photocatalytic ozonation (PO) synergistic effects between photocatalysis and ozonation enhance the rate of oxidation of organic compounds, therefore this integrated process is very promising for use in water treatment. In the present work, it is demonstrated that the improvement that can be obtained by the integrated process in comparison with the uncoupled processes depends on the relative weight between photocatalysis and ozonation. In this respect, it has been found that a relatively low rate of photocatalysis (0.3 times the rate of ozonation) is sufficient to get the highest synergy and to maximize the performances in the oxidation of formate, the adopted model organic …
Photocatalytic ozonation:Maximization of the reaction rate and control of undesired by-products
2014
In theso-calledphotocatalyticozonation(PO)synergisticeffectsbetweenphotocatalysisandozonation enhance therateofoxidationoforganiccompounds,thereforethisintegratedprocessisverypromising for useinwatertreatment.Inthepresentwork,itisdemonstratedthattheimprovementthatcanbe obtained bytheintegratedprocessincomparisonwiththeuncoupledprocessesdependsontherelative weight between photocatalysis and ozonation. In this respect, it has been found that a relatively low rate of photocatalysis (0.3 times the rate of ozonation)issufficienttogetthehighestsynergyandtomaximize the performancesintheoxidationofformate,theadoptedmodelorganiccompound.Thebenefitsof the couplingofphotocatalysistoozonationarenotlimi…
Analisi stratigrafico geotecnica del settore meridionale della città di Palermo finalizzata alla caratterizzazione di fattori di pericolosità sismica…
2006
Una analisi della distribuzione del danno prodotto dall'attività sismica del settembre 2002 ha evidenziato la presenza di anomalie nel settore meridionale della città di Palermo, interessato da un edificato recente. In questo lavoro viene effettuata una ricostruzione della geologia di superficie e di sottosuolo in tale settore e, con il supporto di un database stratigrafico-geotecnico, ad elevata densità di dati, vi-sualizzabile e interrogabile su cartografia georeferenziata, vengono definite le zone del settore caratterizzate da una geologia locale favorevole alla generazione di effetti di sito per il verificarsi di una delle seguenti condizioni: a) valore del contrasto di impedenza acusti…